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1. 1 1 00 Standby Power Supply Overview The standby power supply is a switching power supply used to create Standby 5V The Standby 5V line is used to power the Tuning Micon and EEPROM and any other circuits which need power when the set is OFF Converter Operation Operation of the Standby power supply begins when the set is plugged in The AC line voltage is applied across the standby power supply The AC low side is ground for this circuit The AC high side is applied to a half wave rectifier consisting of D621 and D622 Two diodes are used so that there will be protection should one of them fail This voltage is then ap plied to T621 1 SRT Input through R639 R639 is a fusible resistor used for current limiting and failure protection It will open if the standby switch ing circuit draws excessive current Please note that the board has T621 SBT silk screened on it This differs from the service manual which calls T621 SRT When the voltage is applied to T621 1 SRT Input current flows through the winding and R631 to Q621 G 0621 Converter is a FET with added protection When a positive voltage is applied to the gate it begins to conduct drain to source This reduces the voltage at T621 3 to close to zero Normally this would reduce the voltage at Q621 G but a voltage is supplied to the gate through R632 and C630 from T621 4 This voltage is induced into the secondary winding of T621 4 when current flows through the winding betwe
2. side See Fig 3 Y Magnets located on the Neck Assembly A djust the taps simultaneously to achieve the best geometry After adjusting this magnet please confirm the over all geometry again V Trap etc could also affect the geometry as well Reference Tomohiro Mori PRINTED IN USA Adjust the taps simultaneously to achieve the best geometry After adjusting this magnet please confirm the over all geometry again V Trap etc could also affect the geometry as well H Trap Distortion If H Trapezoid geometry is present you can adjust the H trap RV941 on the WA Board See Fig 4 After adjusting check the overall geometry again since V Bow can also affect the Trapezoid distortion H Trap WA Board RV941 SONY CONFIDENTIAL s Sony Service Compan National Service Bu letin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 24FV10 KV 27FV15 KV 32FV1 KV 32FS10 No 425 KV 32FV15 KV 32XBR200 KV 32XBR250 KV 36FV1 KV 36FS10 KV 36FV15 KV 36XBR200 KV 36XBR250 Subject Part Number for TLH Plate Dater October z 1999 Symptom XXXX Need the part number for the TLH plate which slides into the Yoke Solution If a yoke needs replacement the TLH plate should be removed from the old yoke and inserted into the new yoke If the TLH Plate was lost or misplaced the TLH plate part number is listed below Chassis Descript
3. Horizontal linearity is determined by feeding back the yoke return signal through an elaborate filter network which is made up of T505 and its associated components to reference of the horizontal output R576 501 H gt CENTERING R511 R512 JW R520 S502 H CENTERING D505 D506 KI H OUT 34 D502 L 554 050 A 200V 503 1 2 11 26 1193 12 22 99 Pincushion Overview The purpose of the pincushion circuit is to correct for deflection distortion This distortion occurs because of the yokes inability to create a linear beam scan The result would be a picture bowed at the sides We com pensate for this problem by using pincushion correction circuits to control the amount of current that can flow through the horizontal output s return More current is delivered so the beam can be pushed to the sides of the tube when necessary Circuit Description The E W signal from IC355 11 is input to 10501 Pin Control at its inverting input A sample of the ABL signal from T503 11 is also input to this same input The main HP signal from C510 in the Horizontal Output section is applied to R524 The signal is applied to a clamp that consists of D518 D523 and D524 15 also applied to R525 and D516 This signal is now stripped of its negative component and integrated by C530 This signal is then ap plied to 501 5 non inverting input 1C501 Pin Control compares the inverting and non inverting
4. 0653 OCP amp 12643 FOR L642 R652 REGULATION X 0648 BER EZO1 soavi TO D605 FOLDBACK L650 SECONDARY SUPPLIES 6 26 1190 122299 22 23 Flyback Secondary Voltages Distribution The following voltages are scan derived This means that some windings of the flyback transformer have their signals rectified to create additional power supply lines 200 Volts C Board 1701 CRT Amp 12 Volts A Board IC501 Pin Control IC561 V Out 15 Volts IC501 Pin Control 12561 V Out Q511 Pin Drive WA Board 961 N S Amp The scan derived supplies are developed when the output from Q502 H Out is input to T503 Flyback Transformer This signal is used to create the boosted B 200 on the primary side and the 12 and 15 volts on the secondary side The signal from T503 4 is sent through R553 and rectified by D534 This voltage is output from CN503 5 on the A board to CN503 on the C board This voltage is used to supply IC1761 CRT Amp on the C board This connector can be disconnected to check to see if the problem is with IC1761 CRT Amp T503 FLYBACK The 12 volt line is derived from the signal at T503 9 It is sent through R537 and rectified by D531 In the event that a short occurs on this line R537 may open Since the vertical output is supplied by this line R537 should always be checked if a vertical output failure is suspected The 15 volt line is derived from the signal at T503 7
5. 1 OTHER No OSD No TXT Check zener diode D817 5 1 on main PCB Intermittently volume bar appears Replace tactile switches 59001 and 59002 D board Incomplete or messy OSD and menus TXT OK Replace IC1001 Sony Circuit I have posted this before as a trouble shooting aid It should explain what is happening I don t have the manual in front of me so this may be a little generic The IK circuit sends out a 100 white pulse during the vertical blanking interval There is a pulse for red then green and lastly blue Each pulse is on a different See DISCLAIMER Information presented here is derived from many sources and is believed to be correct For Test Explained by Dan Mundy CET CSM scan line The IK circuit then matrixes them together amplifies the 3 pulses and send it back to the jungle IC Using a scope with delayed sweep or set at the vertical rate and expended 10X you should be able to see the 3 pulses at the IK output from the CRT board and note that the amplitude will grow or shrink depending on the screen setting If one color is missing then you have an amp circuit problem for that color If none of the pulses are there and they go in from the jungle IC then look for bad IK amp transistor If the pulses are there but do not vary with changing screen voltage the feed back to the jungle IC or the IC itself is bad Some times the jungle IC has small Mylar caps off
6. 501 2 at ground potential In that case IC501 1 would output 12 volts that would turn Q301 ON and ground the HP signal that is connected to Q301 If Q301 turns ON IC355 would shut OFF the drive signal at 1 355 19 HD When the drive signal is removed the High Voltage is removed from the set This will cause a no video condition but the Timer LED will not begin to blink If the set is turned on with a failure that causes H protect to occur High Voltage would begin to come up and then disappear The timer LED would blink to indicate that the AKB circuit did not unblank the video The Timer LED only indicates an AKB failure when the set is turned from OFF to ON 510 NORMALLY FROM SN e504 0512 R544 gt PIN gt C548 792 R514 MTZJ 7 5X R532 uet 0521 4 DRIVE 8550 R529 T503 5 FLYBACK 14 5312 530 522 532 503 CN1103 2 BOARD CONNECTOR CN1764 H P ROTECT 13CTV26 1195 1 4 00 38 SONY CONFIDENTIAL Sony Service Company National Technical Services Service Bulleti n A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 No 41 2 Subject Part Number Correction Date Orban ts Taa Reference No 4 Board Symptom XXXX The part number listed on page 66 of the Service Manual for Ref 4 A Board is incorrect Solution Please note the correct part numb
7. Timer LED Flashing HV Normal Power Switch OFF Two clicks Power and degauss relays as normal Two normal clicks but third click degauss isnt heard for 30 seconds No video for 30 seconds then flashing horizontal line across the screen Line is about 1 inch thick Normal Flashing for first 30 seconds then stops Normal Two clicks Power and degauss relays as normal Missing data or clock Missing Scan derived 12 volts Three relay clicks Power Relay degauss and then degauss again Second degauss click occurs quicker than normal Three relay clicks Two are normal third is shutdown None May or may not be heard before shutdown Not flashing Flashing Comes up until shutdown Two clicks Power and degauss relays as normal No click Missing Scan derived 15 volts Shorted Or open C565 Two clicks Power and Degauss relays Normal three clicks Yes but there are two red green and blue lines each in the top half of the picture If video is input these lines remain and white retrace lines are seen in the top May or may not be heard before shutdown Flashing Normal Flashes until picture is displayed Normal Two clicks Power and degauss relays as normal Two clicks Power and degauss relays as normal 0388 12V SCAN DERIVED gt SEE R537 VI2V 9942 503 8
8. odes then automatically adjust the bias of each individual gun to compensate for Kinescope aging Unfortunately for the owner they also will blank the picture when the Kine slumps too low Some tech s have been able to Rejuvinate the Kine amp restore performance while others have wondered if there was a way to bypass that IK circuit That answer has been always been NO Until now Jorge Miret of J C Electronic Repairs in Puerto Rico has discovered a circuit modification which will allow a bypass of that circuit It is found on a Spanish Language website www comunidadelectronicos com articulos IK htm which makes it a bit tough on us Gringo s but not to worry Google the ever help ful search engine is capable of translating as you ve learned in another article published within the pages of The Speaker Following 1s a machine translation of that webpage aided by your reporter where necessary A diagram of the circuit modification 1 provided It involves cutting a trace and the addition of 3 diodes Translation for Gringo s Following is a brief description of the Operation of the IK circuit From each output of the Jungle Chip R G B exits a pulse three pulses in all one to cathode of the Kine These pulses are at the hori zontal sweep rate so that it activates during the exploration of a line These lines are not visible in the screen since they are sent during the beginning of the vertica
9. 12 volt line would cause D604 and 0608 to turn ON activating the latch 25 Foldback The foldback circuit is a type of protection circuit that uses a winding on T605 PIT to monitor the current drawn by its secondary This voltage is rectified and called Vcc Rect Q624 is set up with the Vcc Rectifier volt age input to the emitter Its base is connected to the Rectified 12 volt line from the secondary side of the supply through D605 and R609 D605 is a zener diode whose breakover voltage is 13 volts This circuit will protect against two failures The first is a rise in the Vcc Rect This voltage is developed by the foldback winding of T605 This winding is used as a current mirror This means that the more current drawn on the secondary of T605 PIT the higher the voltage at T605 8 When too much current is drawn from the secondary Q624 would turn ON because of the increase in voltage across R610 If this occurs the latch and soft start circuits will be activated Soft start is activated to lower the output supply voltage by increasing the switching frequency The latch s purpose is to shut the supply down Secondly if there were a loss of the 12 volt line then 0605 would breakover This would cause sufficient current flow through R610 and Q624 would turn ON If this occurs the latch and soft start circuits will be activated 601 0603 0607 RD6 8ESB2 R610 e f Q624 D606 R609 FOLDBACK RD24ES
10. Parental Guidance suggested TV 14 Parents Strongly cautioned Select category TV MA Mature Audience only Movelil Select E Exit Content based options FV Fantasy Violence D Suggestive Dialogue L Strong Language S Sexual situations V Violence U S models only MOVIE RATINGS G All children ou TV PG Directed to older children PG 13 L PG 13 General Audience Ras R Parental Guidance suggested 17 one under 17 admitted X No one under 17 admitted U S models only VIEW ALL Allows all unrated programming BLOCK TV Blocks all unrated TV programs BLOCK MOVIE Blocks all unrated movies BLOCK ALL Blocks unrated programming TV RATINGS MENU Select rating Movo Select Exit UNRATED Glock programs or movies that are broadcast without rating CUSTOM MENU TV RATINGS MOVIE RATINGS UNRATED VIEW ALL 2MENU Select category Move Select i Exit The TV Ratings are both age and content based The level of the content rating is also based on age For example a program with a TV PG V Violence rating may contain moderate violence while a TV 14 V rating may contain more intense violence The consumer may choose to block Unrated programs If they do this they need to be aware that emergency broadcasts political programs sports news public service announcements religious programs and weather programs may be blocked Parental Control Menu Sony V Chip equi
11. The control winding deter mines the switching frequency of the converter After soft start operation is complete the regulation circuit takes over operation of the control wind ing This allows the converter s output to be coupled through T605 to the secondary supplies These supplies supply power to the rest of the set The regulation circuit monitors the 135 volt line Shortly after the click of the power relay at turn ON another click is heard This click is RY601 Degauss Relay closing This may be accompanied by a hum sound that indicates the operation of the degaussing coils After the AKB circuit operation is considered normal the degaussing relay opens This is the third click that occurs about 8 10 seconds after the unit is turned ON During operation of the set the 135 volt line is monitored for DC protec tion This protection circuit is used in conjunction with the latch to switch the Power ON line LOW if a failure should occur This will turn RY600 Power Relay OFF and turn the power supply OFF In addition to this protection circuit a foldback circuit can also shut down the power supply The foldback circuit compares the secondary s 12 volt output to a volt age on the primary side If there is a problem with either one of these circuits the set will shut down RY601 d CONVERTER SOFT START FOLDBACK REGULATION PROTECTION amp LATCH POWER SUPPLY BLOCK STANDBY 5V 5V AUDIO B el telli ot 7CTV26
12. gt 15 Compact Text test fail POWER UP ONLY gt 16 AV switch cannot power on reset 17 Cannot initialise jungle 18 NVM acknowledge fail after initialisation 19 Multiple devices with no acknowledge POWER UP ONLY 20 Compact Text run time failure 21 AVSWITCH response failure after power up 22 JUNGLE CHROMA controller response failure after power up 23 Compact Text does not respond 24 Sound processor run time failure 25 M3L bus clock low time out after data sent run time failure 26 M3L bus clock low time out afetr data sent power up 27 M3L bus clock low time out afetr data sent initialization 28 DSP run time failure Replacement of HV transformer Two types of high voltage transformer are used removable or fixed focus cable When replacing a line transformer replace using the original type Type Focus cable Part A Removable 1 453 169 12 Fixed 1 453 220 11 DEFLECT Lines tearing when hot 32in models only Replace line driver transformer T804 No sync in TXT mode Replace IC1001 PICTURE Horizontal interference in picture during first half hour IC606 is defective Therefor unstable 9V pin 3 of IC606 Replace regulator IC606 Ref Description Location Part no IC606 LM2940T 90 D board PSU 8 759 267 25 Visible arcing interference on screen when appliance does function Intermittently switches off when switched on Replace line output transformer T803 Pa
13. in the devices overview Set the value of register 78 R22 HWE 1 main in at 65 Symptom 3 No sync only lines Fault Crystal X1801 is defective Replace X1801 10MHz 1 579 175 11 on the B board VPD between pin 20 and 21 of IC1816 Model SONY AE4 Fault area 3 AUDIO Symptom 1 Noisy hissing sound and static from the speakers Fault Sound processor IC201 MSP3400CPS C6 T is defective replace 10201 8 759 376 56 The IC is extremely temperature sensitive Symptom 2 Hum from centre and surround speakers Fault Interference of vertical deflection To reduce hum reposition signal and supply leads between K board and D board Distance between leads and 0745 must be as big as possible Model SONY AE4 Fault area 4 POWER Symptom 1 Dead Fault Transformer T602 on the G board has S C P N 1 427 864 11 Symptom 2 Dead or switches off immediately No error code given Fault IC802 Vertical out D board is defective R818 and or R819 possible also open circuit Replace IC802 Add a diode between pin 2 IC802 and earth Do the same between 4 and earth cover the entire top side of the heatsink with insulating tape IC802 STV9379 8 759 192 71 D875 MTZL20D 8 719 048 52 D876 MTZL20D 8 719 048 52 R818 0 47 1 249 377 11 fusible R819 0 47 1 249 377 11 fusible Model SONY AE4 Fault area 5 FUNCTION Symptom 1 Dead Fault B board supplies incorrect pulses causing def
14. Bee IC355 15 VM OUT V PROTECT R384 R568 p R387 R561 1 9 21315 0384 R567 C568 R585 TION MTZJ11B R559 3 R578 TH501 VTIM 15V SCAN gt 9536 0530 BOARD 503 7 VERTICAL DEFLECTION 10CTV26 1194 1 4 00 30 Horizontal Deflection Block Overview The horizontal deflection block creates the signal that drives the horizon tal yoke and also drives the flyback transformer to create the necessary high voltage focus voltage and other voltages used by the set The HD signal originates from the Y C J The HD signal is applied to the amplifiers in the H drive and H Out circuits The signal that exits the H Out transistor is applied to the flyback transformer and the deflection yoke The deflection yoke uses magnetic fields formed by the current through it to drive the beam across the screen Feedback from the yoke is coupled to the centering and linearity circuits This circuit ensures that the picture will be linear and centered properly These circuits work in conjunction with the pin amp on the return to the H Out 31 The purpose of the pincushion circuit is to correct for deflection distortion which occurs because of the yoke s inability to create a linear beam scan The result would be a picture bowed at the sides We compensate for this problem by using pincushion correction circuits to control the amount of current that can flow through
15. Distorted or loud crackling from audio Check audio demodulator processor chip IC202 MSP3410 POWER EHT comes up briefly then nothing No error code Excess current protection system operating Check line output transformer T803 Intermittently switches off when switched on Visible arcing interference on screen when appliance does function Replace line output transformer T803 Locks when hot Replace 12202 MSP3410 Shuts down when hot Replace IC202 MSP3410 FUNCTION No TXT No OSD Check zener diode D817 5 1V on main PCB Comes on then switches to standby Standby LED flashes twice 1 Check field output chip IC500 STV9379 2 OK if D505 disconnected Check zener diode D505 MTZJT7736A for leaks 3 No change 1 D505 disconnected Replace memory chip IC2 Does not got into standby mode completely picture disappears but line continues to run 1 Check Q602 Q603 and Q604 in standby switching circuit Check reservoir capacitor C615 2 Above components replaced HT not at 135V Replace error detector chip IC602 SE135N Pulses in and out of standby RY600 clicks each time Check 0601 25 3852 D603 6 8V zener and R634 22R on primary side of PSU Degaussing incomplete Replace relay RY600 with part number 1 755 018 11 TUNING MEMORY Intermittently channels change Replace tactile switches 59001 and 59002 D board GEOMETRY E W bowing Excessive width Check R870 1
16. Q647 ON and discharges C602 through R627 Q646 Backup will also be turned OFF when the Power On line becomes HIGH 19 Regulation The power supply is regulated by the control winding of PRT T603 7 and 8 in the following manner An increase in voltage across the control winding will reduce the induc tance of the windings in T603 consequently increasing the converter fre quency When the converter frequency increases it moves further away from the optimum operating frequency of T605 PIT reducing the voltage at the secondary outputs The opposite occurs when the voltage across pins 7 and 8 decreases A correction voltage is produced by IC643 4 which varies inversely proportional to the 135 line Pin 7 of the trans former control winding is connected to the correction voltage The other leg of the control winding pin 8 is connected to the output from D603 Vcc Rectifier The difference in the voltage across this winding determines the frequency of the converter which regulates the 135 Volt line as de scribed in the previous sections Foldback The foldback circuit is a type of protection circuit that uses a winding on T605 PIT to monitor the current drawn by its secondary This voltage is rectified and called Vcc Rect Q624 is set up with the Vcc Rectifier volt age input to the emitter Its base is connected to the Rectified 12 volt line from the secondary side of the supply through D605 and R609 D605 is a zener diode whose br
17. analyzes three TV scanning lines at a time for better color Vertical Aperture Compensation sharpens picture definition and edge detail on the vertical plane producing sharp horizontal edges Steady Sound Automatic Volume Control with BBE equalizes the volume levels so there is consistency between programs and commer cials Auto SRS Sound Enhancement creates a vivid stereo image using the principles of human hearing to make the sound appear to come from widely separated speakers Magnetic Quadra Pole reduces beam spot distortion and improves cor ner to corner focus as well as picture sharpness Board Descriptions Description Micon Y C Jungle Tuner Pincushion H Deflection V Deflection H Deflection Syston Audio Amp Surround Sound Sub tuner S Link RGB Drive Power Supply Front A V Inputs Menu Buttons IR Detector Buttons T XBR Only IR Headphones UX XBR Only 3D Comb Filter A V Switch Audio Control SRS Chroma Decode PIP Encode UY All Except XBR 3 Line Comb Filter A V Switch Audio Control SRS Chroma Decode PIP Encode except FS10 model WA Velocity Modulation Quadrapole T XBR only XBR Non XBR CIRCUIT BOARDS LOCATION Picture Tu be Defect Sym ptoms Bright picture Grid 2 to Symptom is Reduce G2 screen voltage with r
18. by T501 to drive the horizontal output Q502 B E junction Q502 B 10V 20us 33 Horizontal Output Q502 is the H output transistor and it drives two circuits The deflection yoke Develops a magnetic field in order to move the electron beam from left to right on the screen The flyback transformers Develops high focus and screen voltages The scan derived power supplies are also developed here They are 200 volts 12 volts and 15 volts for the CRT Amp and TV s vertical section Heater voltage for the tube s filament is also developed here The horizontal protection circuit also uses the heater voltage The HP pulse is fed back to monitor the frequency of the horizontal oscil lator The horizontal output is also modulated by Q512 Pin Out This is necessary to correct for pincushion distortion that would be seen if cor rection were not used C510 10V 20us 501 3 50V 20us Horizontal Centering and Linearity Changing the DC voltage at the return line of the horizontal yoke performs horizontal Centering The 135 volt line is switched through a series of voltage dividers using S501 and S502 The different combination of switch settings changes the DC level at the yoke return and consequently the centering of the picture
19. controls the frequency at which the converter oper ates Soft Start At power ON C602 which is discharged has a OV potential at its termi nal This biases Q645 ON via R647 With this transistor ON it allows the standby unregulated from Q646 E to be applied across T603 7 and 8 This voltage is passed through Q646 Backup since the same line that turns RY600 Power Relay ON turns it ON The greater the voltage across this winding the higher the converter frequency and the lower the effi ciency of T605 PIT This is discussed in the Converter section There fore the start up secondary voltages will be reduced considerably As C602 charges the voltage difference between T603 7 and 8 diminishes As this voltage lowers the secondary voltages will rise When the Vcc Rectifier voltage is larger than the Standby unregulated voltage D612 will begin to conduct and the Vcc Rectifier voltage will control T603 8 Also at this time C602 will be fully charged and 643 Control IC will take control over T603 7 The difference in voltage between T603 7 and 8 will regu late the converters operating frequency Soft Start Reset It is important that the soft start capacitor C602 be fully discharged when the set is turned OFF Turning 0648 OFF when the unit is turned OFF does this This removes the ground path from the relay opening it up It also allows current from the Standby 5V to flow through the relay coil through R621 to Q647 B This turns the
20. range and then blank again at very high position of the control AFTER the Mod The pic ture was present throughout the entire rotation of the screen control I assume that Sony s intent was to prevent a poor picture from being seen as the kine aged beyond limits With this modification you can watch a crappy picture throughout the entire range of the control if you so desire Naturally this procedure is presented only as a Test procedure to determine if the IK Blanking Circuit is indeed keeping the picture from appearing No technician would ever leave the mod in as a permanent fix and The Speaker would never recommend any procedure contrary to the manufacturer s approved practices BLUE CURRENT DETECTOR GREEN CURRENT DETECTOR RED CURRENT DETECTOR 22 18 20 16 JUNGLE CHIP 1N4148 DIODES 25 1465 21 1870 FIGURE 2 SONY 1 CIRCUIT SCHEMATIC SON Y Training Manual WEGA Direct View Television AA 2W Chassis Models KV27FV15 KV32FV15 KV36FV15 KV32FS10 KV36FS10 KV32XBR250 KV36XBR250 Circuit Description and Troubleshooting Course CTV 26 Sony Service Company A Division of Sony Electronics Inc 1999 All Rights Reserved Printed in U S A SONY isatrademarkof Sony Electronics Circuit Description and Troubleshooting Model kvezrvis KV32FV15 KV32FV15 KV36FV15 KV32FS10 KV36FS10 KV32XBR250 KV36XBR250 Prepared by National T
21. the horizontal output s return More current is delivered so the beam can be pushed to the sides of the tube when necessary The drive for the Pin amp is created in the Y C J and is called E W drive It is applied to the Pin amp with a sample of the HP pulse Q512 controls the current through the H Out return A protection circuit also monitors the HP signal This protection circuit allows HP signals to pass to the Y C J if the Pin amp and H Out circuits are operating normally In the event of a failure the HP Hoff line to the Y C J would go LOW The Y C J would then disable HD which would cause high voltage to be lost T503 HV FLYBACK ey SCAN 200 DERIVED 12 SUPPLIES 15 Q512 PIN AMP CENTERING LINEARITY HP H OFF H PROTECT HORIZONTAL DEFLECTION BLOCK 14cTv26 01 01 00 32 Horizontal Out Overview The horizontal output circuit below consists of the Horizontal Oscillator Horizontal Drive Horizontal Output Flyback and Horizontal Centering and Linearity Horizontal Oscillator When the TV is turned ON Set 9Vdc appears and is applied to Y C Jungle 55 33 and 44 55 contains a horizontal oscillator that is shaped into a horizontal drive pulse that leaves at pin 19 501 5V 20us Horizontal Drive Q501 amplifies this HD signal and outputs the signal from its collector This signal is coupled
22. 752 911 19 KV 32FS10 IC001 85856 024 CXP85856A 035S 8 752 911 19 KV 36FS10 001 CXP85856A 024Q CXP85856A 035S 8 752 911 19 KV 32FV15 001 CXP85856A 024Q CXP85856A 035S 8 752 911 19 KV 36FV15 001 CXP85856A 024Q CXP85856A 035S 8 752 911 19 KV 001 CXP85856A 024Q CXP85856A 035S 8 752 911 19 32XBR250 KV 001 CXP85856A 024Q CXP85856A 035S 8 752 911 19 36XBR250 Model SONY AE4 Fault area 1 COLOUR Symptom 1 Changing background colour in TXT V2 5 Fault This is a feature of TXT V2 5 Feature can be switched off through TT18 Close off with 00 TT17 will undo this again if necessary Symptom 2 Blue is predominant Fault Legs of R711 are too long and S C Cut legs off to correct size Location Section C board VPA Model SONY AE4 Fault area 2 PICTURE Symptom 2 Picture runs vertically Fault Deflection processor 403 is defective through which there is V sync on pin 28 of IC403 Replace 403 SDA9361 8 759 421 42 Symptom 4 No picture Fault Short between pin 66 and 67 on A board of IC201 Symptom 5 Picture is very dark and only consists of chroma info Fault Poor contact of connector CN1810 connection between A board and B board Disconnect white wire and restore contacts Symptom 1 Jitters Vertically in PAL plus mode Fault Data corruption or incorrect setting Via service TT mode using the menu keys on the remote control go to features box
23. D2 D605 MTZJ T 77 13A FROM 12 A D648 EZO150AVI OVP 12 R606 NORMALLY ON RD6 8ESB2 TO CN641 1 B TO Q648 POWER ON POWER ON FROM CN641 11 TO D612 CONVERTER REGULATION TO SOFT START RESET Q647 B POWER SUPPLY PROTECTION 1CTV26 1185 3 22 00 26 Vertical Deflection The vertical deflection stage consists of the Vertical oscillator Vertical amplifier Flyback generator and the Deflection yoke The purpose of this stage is to manufacture a magnetic field The magnetic field will bring the electron beam gradually from top to bottom vertically and then quickly back to the top beam retrace of the screen to start over again Vertical Oscillator When the TV is turned Set 9Vdc appears at Y C Jungle 1C301 33 and 44 The internal horizontal oscillator begins and is counted down divided to 60 Hz to become the vertical drive signal The drive signal is formed into a positive and negative ramp and its amplitude and linearity are determined by the serial data from 001 Tuning Micon If the data or clock signal at 1 355 34 and 35 were missing there would be NO vertical drive at IC301 13 and 14 Vertical Amplifier 561 Vertical Output is a single package vertical amplifier that outputs a waveform with sufficient amplitude and current to drive the deflection yoke It is powered by 12 and 15 volts from the flyback transformer secondary Flyback Boost Generator Th
24. It is sent through R536 and rectified by D530 In the event that a short occurs on this line R536 may open Since the vertical output is supplied by this line R536 should always be checked if a vertical output failure is suspected In addition to the scan derived supply voltages T503 Flyback Transformer also develops heater voltage from T503 5 T503 also develops high volt age focus voltage and ABL FRoM 502 H OUT 4 2 8537 0531 7 D 15 536 0530 553 0534 gt 12 To Board 12501 Pin Control 12561 V Out 12501 Pin Control 16561 V Out 0511 Pin Drive WA Board 12961 N S Amp TOH TO CN503 C BOARD AM PROTECT 1 5 CN503 SCAN DERIVED SUPPLIES table below describes various symptoms that can occur if there is short on any of the power supply lines These types of problems occur when major components being supplied fail by shorting An example Many times observing all the symptoms can lead you towards the correct failed component or problem All of your senses should be used when troubleshooting What you see hear and smell can often lead you to would be if the audio amp were to fail the set might shut down as if the quick fix Audio B line were shorted Voltage Relay Clicks Video Audio Timer HV Power Switch OFF Suspect LED 135 2
25. N602 C R607 CN603 F601 C605 vDR601 0 1 OHM 1 H 0629 E R62 C607 625 CONVERTER C606 D630 R624 O HPSEL 2 12 001 33 1641 12 eee Q646 B ABD 5V BACKUP AND Q647 B SOFT START IC001 62 VIA 2 1641 11 FROM Q642 E G BOARD aci POWER ON DEGAUSSING 4CTV26 1188 12 28 99 14 Converter Overview The function of the converter is to switch the Converter B voltage through a transformer s primary winding This switching will produce a signal that will be coupled to the transformers secondary windings where they are rectified and used to supply various voltages to the set The frequency of this switching is controlled to maintain a consistent value on the 135 volt line Changing the frequency of the switching can be used for regulation due to the efficiency characteristics of the transformer A second trans former with a cross inductance winding is used to create a dual tank oscillator The voltage across the cross inductance winding or control winding is used to change the value of the inductance in the tank circuit and consequently change the frequency of switching Initial Start Up When RY600 Power Relay not shown is closed 300 VDC is developed and applied to R607 Converter is then applied to C613 and C615 C613 ensures that the bottom transistor IC601 1 turns ON initially When 601 1 turns ON there is a current path throug
26. USEFUL INFO Error reader The BE 3D chassis supports the use of the Error Reader This jig is available under part number S 188 900 10 price code S The displayed code shows the actual error of the TV set Refer to the service manual or the table below for an explanation of those codes ERROR CODES 02 Protection circuit trip lt ANY TIME gt 03 SCL LOW lt POWER UP ONLY gt 04 SDA LOW lt POWER UP ONLY gt 05 SDA and SCL LOW lt POWER UP ONLY gt 06 Jungle chroma controller no acknowledge lt POWER UP ONLY gt 07 Video switch no acknowledge lt POWER UP ONLY gt 08 Tuner no acknowledge 09 MSP no acknowledge 10 NVM no acknowledge 11 M3L TXD LOW POWER UP ONLY gt 12 M3L RXD LOW POWER UP ONLY gt 13 M3L ENABLE LOW POWER UP ONLY gt 14 M3L TXD AND RXD LOW POWER UP gt 15 Compact Text test fail POWER UP ONLY gt 16 AV switch cannot power on reset 17 Cannot initialise jungle 18 NVM acknowledge fail after initialisation 19 Multiple devices with no acknowledge POWER UP ONLY 20 Compact Text run time failure 21 AVSWITCH response failure after power up 22 JUNGLE CHROMA controller response failure after power up 23 Compact Text does not respond 24 Sound processor run time failure 25 M3L bus clock low time out after data sent run time failure 26 M3L bus clock low time out afetr data sent power up 27 M3L bus clock low time out afetr d
27. Video Data 2 1 Replace the CPU IC001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the 2SHU 2COL amp SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the 2SHU 2COL amp SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from 0 to 2 7 Write the new data into the CPU using the remote press the Mute then Enter key 32 36 XBR models In the service Mode record on paper the following register information in both RF amp Video mode VP SSHP RF Data Video Data DA 2COL RF Data Video Data DA 2SHU RF Data Video Data 1 Replace the CPU IC001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the 2SHU 2COL amp SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the 2SHU 2COL amp SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from 9 to 11 7 Write the new data into the CPU using the remote press the Mute then Enter key Model Part Number KV 27FV15 IC001 CXP85856A 029S CXP85856A 035S 8
28. age coupled to the secondary winding consisting of T621 8 and 9 If the load on the second ary output increases the frequency of switching will decrease This brings the frequency of the converter closer to the optimum operating frequency of T621 SRT Moving closer to this optimum frequency causes more voltage to be provided at T621 9 The opposite occurs when the load on the supply decreases This causes the frequency of operation to be in creased and the amount of voltage coupled to T621 9 to be decreased The supply typically operates at 45 kHz when the set is OFF and at about 30 kHz when the set is operating The incoming line voltage also effects the frequency of switching operation 28621 8639 0621 4 7 OHMS gt R640 691 A D623 0621 25 2845 623 48664 Lo SIDE C630 R632 D626 R638 RD6 2ESB2 STANDBY SUPPLY 10 TO RY600 POWER RELAY 622 7 2VDC 5 STANDBY 5V TO CN1641 TO Q646 E BACKUP 3 26 1187 12 28 99 Over Current Protection OCP Monitoring the voltage across R637 is used for over current protection This voltage is representative of the amount of current flowing through Q621 Converter since it is in series with the transistor If this voltage should rise to 6 volts it will cause Q622 to turn ON If Q622 were to turn ON it would shunt Q621 G voltage to ground This would cause Q621 Converter to stop conducting Over Voltage Protec
29. at you ve just read was tributed By Jorge Miret and appears to be written by Luis Alberto Tamiet on the website listed in the first paragraph As the entire site is in Spanish I am not sure of the actual author The Speaker would like to thank Both of these Techs for adding to our store of knowledge Take the information for what it s worth I ve not tried it and neither has the contributor so we can t speak of it s efficacy from personal experience It is presented as another di agnostic tool to determine whether the blanking is caused by the jungle chip or the kine BLUE CURRENT DETECTOR GREEN CURRENT DETECTOR RED CURRENT DETECTOR ADD 3 B JUNGLE CHIP Of course no tech would ever leave the bypass circuit in as a permanent measure nor would The Speaker ever recommend a modification not authorized by the manufacturer If you try this we d like to hear of your experience and opinion as to it s value 1N4148 DIODES See follow up article next page Author Joe Sopko Tried This Procedure Sony IK bypass Recently The Speaker printed an article describing a procedure to bypass the Sony IK circuit The procedure came from a Latin American site and at the time of printing we didn t know of anyone who had actually tried it or if it was actually effective Heck it took us long enough just to translate the thing Subsequent to that time a Sony 20520 came into Consumer Se
30. ata sent initialization 28 DSP run time failure Replacement of HV transformer Two types of high voltage transformer are used removable or fixed focus cable When replacing a line transformer replace using the original type Type Focus cable Part A Removable 1 453 169 12 Fixed 1 453 220 11 DEFLECT Lines tearing when hot 32in models only Replace line driver transformer T804 No sync in TXT mode Replace IC1001 PICTURE Horizontal interference in picture during first half hour IC606 is defective Therefor unstable 9V pin 3 of IC606 Replace regulator IC606 Ref Description Location Part no IC606 LM2940T 90 D board PSU 8 759 267 25 Visible arcing interference on screen when appliance does function Intermittently switches off when switched on Replace line output transformer T803 Partially blanked horizontally Check zener diode D817 RD5 6ESB2 in blanking circuit for leaks Overbright nearly negative picture Access service mode and enter TT07 to clear AUDIO Hum and or buzz of the headphones and or speaker when vol is low Deflection unit generates interference On board A solder side add a thick wire AWG18 200mm long between pins 6 7 and 8 of IC203 and pins 29 and 30 of CN1 Given its critical position the wire must be kept away from board A Part no Ref 190090227 Wire AWG18 No sound Headphones OK Fau t 1 PS6001 O C Replace audio output chip IC1200 TDA7264
31. ce R602 and R603 respectively R605 and R606 with a single 100k 3W Resistor 1 215 929 11 Cases B C and D Replace R602 and R603 respectively R605 and R606 with a single 100k 3W Resistor 1 215 929 11 Sony Customer Relations amp Service Europe European Technical Support Technologielaan 7 B 1840 Londerzeel
32. clicks very close None None Blinking None No relay click but Q502 Out T503 together Power Only Timer LED stops Flyback Q512 Pin blinking Out 12 1 click Power relay IK lines visible OK Normal OK Unit shuts off WA board problem only OSD expanded normally or Q301 or IC353 on almost off screen A Board 9 2 clicks Power Relay None None Blinking None Both relays turn Regulators on A and Degauss relay OFF and Timer LED board Degauss relay never stops blinking turns OFF Audio Normal Normal None Normal Normal Normal PS1461 AK Board B 200 2 clicks very close None None Blinking None No relay click but 1761 CRT Amp together Power Only Timer LED stops Disconnect CN1764 blinking to verify 12 3 clicks 2 Normal but None None Blinking None No clicks 561 Vertical then an extra click Output Check indicating shutdown R537 15 2 clicks Power and None None Blinking Starts to come 2 clicks when set is 12561 Vertical Degauss up but stops turned OFF Output Check after 274 click R536 Converter 1 click Power Relay None None Blinking None 1 click Power Relay 601 and or R607 not only only switching May cause the IC601 Converter to fail 135 if fuse doesn t blow May cause shutdown similar to 24 Power Supply Protection Overview There are three different circuits that can activate the protection latch One is the OCP Over Current Prot
33. d of the ohmmeter to the SOURCE lead 2 Touch the ohmmeter positive lead to the gate to pre charge it 3 Connect the ohmmeter positive lead to the DRAIN If the device is good you will get a resistance reading of about 400 1k ohms Some DVMs do not produce enough DC voltage in the ohms mode diode check mode can be used with these models When using the diode mode a low voltage drop is shown after pre charging the gate 28621 8639 0621 4 7 OHMS gt R640 691 A D623 0621 25 2845 623 48664 Lo SIDE C630 R632 D626 R638 RD6 2ESB2 STANDBY SUPPLY 12 TO RY600 POWER RELAY 622 7 2VDC 5 STANDBY 5V TO CN1641 TO Q646 E BACKUP 3 26 1187 12 28 99 Power On Degaussing Overview This section discusses how the converter B voltage is created when the set is turned ON When the set is turned ON the degaussing circuit is activated Power On When the set is plugged in the AC voltage is applied through F601 T601 and T602 Additional components C605 VDR601 C604 and VDR602 are across the AC line input They are in place for protection from AC line spikes and surges This AC voltage is applied to the standby power sup ply and will be applied to D602 Bridge Rectifier when RY600 Power Relay is closed R623 and R664 will limit the current when the relay is initially closed When the customer turns the set ON using either the remote or t
34. de completely picture disappears but line continues to run 1 Check Q602 Q603 and Q604 in standby switching circuit Check reservoir capacitor C615 2 Above components replaced HT not at 135V Replace error detector chip IC602 SE135N Pulses in and out of standby RY600 clicks each time Check 0601 25 3852 D603 6 8V zener and R634 22R on primary side of PSU Degaussing incomplete Replace relay RY600 with part number 1 755 018 11 TUNING MEMORY Intermittently channels change Replace tactile switches 59001 and 59002 D board GEOMETRY E W bowing Excessive width Check R870 1 1 OTHER No OSD No TXT Check zener diode D817 5 1 on main PCB Intermittently volume bar appears Replace tactile switches 59001 and 59002 D board Incomplete or messy OSD and menus TXT OK Replace IC1001 SONY Service Bulletin Date Ref No Model 24 10 97 TV07897 AE 4 Chassis Subject No Power SYMPTOM Power supply breakdown without being influenced by other parts The power supply does not switch on CAUSE Soft start circuit SOLUTION Perform the following checks and modifications on the G Board Four cases are possible 1 5k resistor R629 is mounted between 0702 17 and JW665 Yes Yes No A 1 5k resistor is mounted between the collector of 0621 and 0702 17 Yes No Yes No Case A Remove R629 1 5k Repla
35. e Service Bu letin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV rod ucts Model KV 27FV15 KV 32FS10 KV 36FS10 422 KV 32FV15 KV 36FV15 KV 32XBR250 No KV 36XBR250 Subject G Board Schematic Correction Dato 2001898 On the Board Schematic the winding connections inside T605 is incorrect The windings between T605 pins 1 amp 2 and windings 3 amp 4 are missing Solution Please refer to the corrected schematic below The proper connections have a winding between T605 pin 1 amp 2 and T605 pin 3 amp 4 There is no winding between T605 pins 2 amp 3 as in the service manual schematic G BOARD COILS FORMERLY NOT ILLUSTRATED Reference FPR U0789 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan H National Tean 5 eti n A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV P rod ucts Model KV 32FS10 KV 32FV15 KV 36FS10 No 424 KV 36FV15 KV 32XBR250 KV 36XBR250 Subject V Bow and H Trap Adjustments Date October 7 1999 Symptom xxxx V Bow and H Trap Adjustments are missing from the Service Manual Solution If the customer complains of poor geometry trapezoidal or bowing the following adjustments might be needed V Bow Geometry distortion like the picture in Fig 1 can be readjusted by using the Y Magnets The Y Magnet is located on the Neck Assembly
36. e cathode To see the image on the screen When the pulses in the IK circuit reach certain amplitude the cut of video is deactivated and the im age appears The lack of video black screen in these TV Sony sometimes causes confusion between the technicians because when not having an output of signal from the jungle chip tend to suppose that the problem is in the Jungle Chip When faced the repair of a recent TV that presents absence of Video black screen we must make the following steps To increase G2 screen voltage If the screen is illuminated with raster swept mal we can discard the possible prob lems in the circuits of sweeping a defect in the Vertical circuit can cause the same symptom This also allows us to quickly verify the necessary voltages for the operation of the CRT filament anode G2 If these voltages are correct is very possible that the problem is in the Kine drive amplifiers in the CRT or in the IK circuit The next step is to verify the state of the CRT If it has low emission in some of the cathodes or if it has some internal short it can cause that IK circuit to stay in cut For this it is advisable to use a Kine Checker If it is not had one the follow ing verification can be made With the TV operating momentarily place a 15 or 20K 2W resistor between ground and each one of the cathodes KR KG and KB one at a time This will result in the corresponding color illu
37. e user can select ratings by age or content If they do not want violence of any kind to be seen but are not offended by strong language they can select the V for PG 14 This will block all V settings above PG 14 Decoding The Parental Guideline Rating that is broadcast by the programmer must be decoded at the receiver This rating data is placed on Line 21 Field 2 or Line 284 r M M pese oem The preceding waveform shows the contents of Line 21 Field 2 We see that right after the burst signal on the back porch of the horizontal sync is a clock signal This clock is used to inform the decoder that data is com ing and to synchronize the decoder and data Since there is other XDS Extended Data Services data on this line the first three data bits are known as the identifier Data 001 identifies the data as Parental Ratings data Then two bytes of data are sent which contain the rating informa tion The first byte contains information about the age rating and the second contains information about the content rating Ratings are decoded by the System Control IC in Sony televisions These ICs contain the programmed information and the decoder When a pro gram is determined to have a rating that should be blocked this is recog nized The System Control IC also contains the OSD outputs When the program is to be blocked the OSD section ou
38. e vertical boost signal is used to generate extra current in the deflec tion yoke during the retrace period This extra current is used to quickly return the electron beam to the top of the picture The flyback generator stage within IC561 uses the vertical signal to make a 30Vp p pulse needed during retrace time The retrace portion of the vertical drive signal input 561 1 and 7 is extracted and ampli fied and appears at pin 3 as a 30Vp p pulse It passes through C565 to provide sufficient current to power 561 6 during retrace time Diode D561 blocks this pulse from the 12 volt source The vertical flyback pulse from 561 3 is sent to the WA board to be used by the Quadra Pole Focus circuit It is also goes to C564 C654 blocks any DC and allows the flyback pulses to be applied to Q652 B These pulses keep Q652 ON and prevents C563 from charging There fore Q561 is always OFF while the set is operating normally If the verti cal flyback pulses were missing the voltage from the 12 volt line through R570 would forward bias Q561 B E This would apply a low to 1C355 15 VM OutN Protect If1C355 15 were to receive a LOW the IC would blank the video If there were problems in this area when the unit is initially turned ON the result would be similar to an AKB problem The degauss relay would not turn OFF and the Timer LED would be flashing Deflection yoke The deflection yoke translates the electrical current flowing through its c
39. eakover voltage is 13 volts This circuit will protect against two failures The first is a rise in the Vcc Rect This voltage is developed by the foldback winding of T605 This winding is used as a current mirror This means that the more current drawn on the secondary of T605 PIT the higher the voltage at T605 8 When too much current is drawn from the secondary Q624 would turn ON because of the increase in voltage across R610 If this occurs the latch and soft start circuits will be activated Soft start is activated to lower the output supply voltage by increasing the switching frequency The latch s purpose is to shut the supply down Secondly if there were a loss of the 12 volt line then D605 would breakover This would cause sufficient current flow through R610 and Q624 would turn ON If this occurs the latch and soft start circuits will be activated STANDBY 5V PART OF 135V RY600 FROM R661 D643 B RECTIFIER CONTROL WINDING TO Q653 B LATCH CN641 11 0606 RD24ESB2 12V FROM D651C 0607 T605 PIT STANDBY UNREG FROM D628 k SOFT START FOLDBACK REGULATION SCTV26 1186 1 4 00 20 Secondary Voltages 135 Volts The signal from the winding of T605 10 and 11 is applied across D643 Bridge Rectifier and C643 and L642 filter the rectified voltage D648 is a 150 volt zener diode that will limit the voltage to 150 volts i
40. ection for the 135 volt line The other two are related to the voltage from T605 3 Foldback Winding When one of these circuits activates the latch RY600 is turned OFF This discon nects the AC from the circuit that develops Converter B and can be noticed during troubleshooting when two clicks are heard in quick succes sion Latch Placing a HIGH on Q653 B activates the latch This turns ON 0653 that turns ON 0652 Once 0652 turns ON its conduction keeps Q653 ON until power is disconnected This places a LOW at Q648 B turning it OFF This causes RY600 Power Relay to open and the set turns OFF 135 Over Current Protection Over current is detected by monitoring the voltage across R652 When this voltage which rises as more current is drawn gets to a level that causes Q651 to turn ON the latch will be activated Vcc Rectified Low Voltage Protect LVP The signal from 605 3 is sent through R601 and rectified by 0603 This voltage is filtered by C618 It is important that this voltage be at a certain level since it is used to control regulation Therefore a circuit is con structed in which Q623 is normally ON This transistor is ON because D607 should always have sufficient bias to turn ON This will place Q623 C at close to ground level This keeps 0604 and 0608 from conducting and activating the latch circuit If this voltage were to fall below a certain level D607 would turn OFF causing Q623 to turn OFF When Q623 is OFF the
41. ective Q802 Replace B board and Q802 Ref Description Location Part no 0802 2SC3997CA D Board DFL 8 729 821 07 B Board B Board compl B Board DFL 1620 077 Symptom 2 No function Fault Clock error of the 2 bus signals SDL and SCL as a result of a malfunction of the tuner BTP EC411 8 598 045 00 or 8 598 045 01 In the tuner change the grounding connection at TSA5512T PLL Model SONY 4 Fault area 6 GEOMETRY 1 Picture is too small with pincushion distortion Fault PIN drive 0803 is defective Replace transistor FET 0803 on D board no 8 729 039 68 USEFUL INFO Error reader The BE 3D chassis supports the use of the Error Reader This jig is available under part number S 188 900 10 price code S The displayed code shows the actual error of the TV set Refer to the service manual or the table below for an explanation of those codes ERROR CODES 02 Protection circuit trip lt ANY TIME gt 03 SCL LOW lt POWER UP ONLY gt 04 SDA LOW lt POWER UP ONLY gt 05 SDA and SCL LOW lt POWER UP ONLY gt 06 Jungle chroma controller no acknowledge lt POWER UP ONLY gt 07 Video switch no acknowledge lt POWER UP ONLY gt 08 Tuner no acknowledge 09 MSP no acknowledge 10 NVM no acknowledge 11 M3L TXD LOW POWER UP ONLY gt 12 M3L RXD LOW POWER UP ONLY gt 13 M3L ENABLE LOW POWER UP ONLY gt 14 M3L TXD AND RXD LOW POWER UP
42. els only When customer swaps audio of main picture and PIP picture customer can hear the audio of PIP picture even when it is supposed to be blocked 4 3D Comb Filter In XBR model only when customer changes video input from S to composite customer can see a Black amp White picture less than one second then color returns Solution If the customer should complain of the following symptoms please do the following 27 inch models 1 Inthe service Mode record on paper the following register information in both RF amp Video mode VP SHUE RF Data Video Data SCOL RF Data Video Data VP SSHP RF Data Video Data 2 1 Replace the CPU 001 2 Enter the service Mode using the remote Then press 8 then Enter This will reset the CPU turning the set off then back on automatically 3 Re enter the Service Mode 4 In the RF mode replace the data in the SHUE SCOL amp SSHP with the recorded data from the original CPU 5 In the Video mode replace the data in the SHUE SCOL amp SSHP with the recorded data from the original CPU 6 Change the Data of ID7 from O to 2 7 Write the new data into the CPU using the remote press the Mute then Enter key 32 36 Non XBR Models Reference Uchida K PRINTED IN USA IX IIX 32 36 Non XBR Models In the service Mode record on paper the following register information in both RF amp Video mode VP SSHP RF Data Video Data DA 2COL RF Data Video Data DA 2SHU RF Data
43. en T621 1 and T621 3 The voltage is not permanent due to C630 As C630 charges it reduces the voltage at Q621 G Once this voltage falls below a certain threshold Q621 Converter turns OFF Once 0621 Converter turns OFF all polarities are reversed This rever sal of polarity helps speed up turn OFF of Q621 D623 along with C631 and R640 form a snubber network voltage clamp This network clamps excessive voltage overshoot caused by the collapsing magnetic field of T621 SRT and returns the excessive voltage to C629 When the field collapses fully current begins to flow through T621 1 and 3 The waveforms below show what will be seen at Q621 Q621 D 50 mv 10 us Q621 G 1 V 10 us an fre fe Pa EX T Es zip T Q621 S 1 V 10 us Regulation Changing the frequency of the switching regulates the output voltage at the secondary winding comprised of T621 8 and 9 Taking a sample volt age from T621 4 and applying it to rectifiers D624 and D625 does this As this voltage rises and falls the rectified voltage is applied to Q622 B through R634 When Q622 begins to conduct it lowers the voltage at Q621 G and changes the switching frequency The changing frequency will change the amount of volt
44. en the picture brightness increases the load increases lowering the voltage across T603 7 and 8 When this occurs the frequency of the oscillator decreases allowing T605 to supply more current to the second ary windings This keeps the 135V line from lowering in voltage The following table shows what occurs with different loads on the supply Note that the oscillator frequency changed but the 135V line remained within a few tenths of a volt of its value You should also be aware that the frequency of operation is also dependent on the input AC line voltage 2 18 VDC V across pins 7 and 2 38 VDC 8 T603 Freq at IC601 E2 V at CN641 1 62 kHz 135 3 66 2 135 6 9 4 BOARD 12V CN1641 SECONDARY CN641 SUPPLIES AUDIO TO AK BOARD CN1463 TO PROTECTION D606 K VCC RECT FROM REGULATOR FROM IC643 4 amp SOFT SOFT START Q645B amp START Q645 E FOLDBACK Q624E FROM BACK UP CONTROL Q646 E WINDING CO NVE RTE R 2CTV26 1186 3 22 00 16 Troubleshooting One of the most common failures in switching power supplies are the converter transistors or in the case of this power supply IC601 601 actually contains two identical transistors They are assembled in this package so that their gain and other characteristics are closely matched Generally when these transistors fail they fail by shorting C E in one or both of the tra
45. er as shown below DESCRIPTION PART NUMBER INCORRECT CORRECT A BOARD A 1298 866 A 1298 886 number is listed correctly 69 Reference FPR U0879 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan National Service Bu letin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV P rod ucts Model KV 36FS10 KV 36FV15 KV 36XBR250 SU 36FD2 No 415 Subject Glass Stand Door rubbing on bottom of Dale 3951988111959 cabinet Symptom 161X Glass doors of the SU 36FD2 stand rubbing on bottom board Glass door scraping off vinyl on bottom board and bowing of bottom board when unit is positioned on high pile carpet Solution If the customer should complain of the symptoms above please do the following Service Part Kit 4 074 400 01 1 Order the Service Part Kit See Fig 1 INSTRUCTION ey eee HOW TO REPLACE PART p TWO WASHERS t JIG FOR SERVICE SCREW ___ SERVICE PARTS KIT IN PLASTIC BAG Fig 1 2 Use the Jig Screw to remove the original pivot by inserting the screw into the pivot hole and pulling down See Fig 2 REMOVING ORIGINAL PIVOT ORIGINAL PIVOT ego INSERT SCREW PULL DOWN amp REMOVE PIVOT Fig 2 Reference ECN KVC01816 PRINTED IN USA Replace the Pivot on the top of the Glas
46. etrace high that all three to the lowest setting lines and or voltage colors are Vary focus control to both Overview poor focus is 3 bright limits several times eakage Below is an excerpt from the CTV 25 course It shows several picture ES iam tube defect symptoms some of which can be repaired without changing and lightly tap the neck to the tube dislodge the particle Defective Picture Tube Symptoms RGB Rainbow Aperture Rainbow of A loose aperture grill is Symptom Suspect Check see rainbow grill was colors can dangerous and may cause Apply 6Vdc to Clean the CRT pins and picture unseated in start at the top tube implosion Use all transit or bottom safety precautions Do not 1 socket for bottom jar set Transport TV face i rainbo down Some heaters Apply 6Vdc to the CRT ne 22 Purity Beam The TVs Same color Do not manually Degauss chers in aan heatei s does not landing is off degaussing blotches the picture tube with a series butali low rebl cethe Diete circuit did remain at that strong degaussing coil os not area of the Repair the TV s degaussing demagnetiz screen circuit The thermistor or Dark picture is to 222 1 Phd ths and remove aperture regardless of cold solder is usually at resistined 5 Apply 15 20Vdc grill metal picture screen fault support changes s its 2 m G2 Onl
47. gt R519 12CTV26 1 1 00 PINCUSHION 36 Protect Overview The H protect circuit is used to shut down the horizontal deflection circuit if the high voltage should rise above the acceptable level or if the pincush ion drive circuit Pulses from the flyback transformer s heater winding are compared against a reference voltage The reference voltage can be removed based on the condition of the Pin Out circuit Loss of Pin Out will cause horizontal protection to be indicated When H protect is detected HP pulses will be removed from 1 355 19 HP Hoff Video and HV will be disabled but the power supply will continue to function Circuit Description When the horizontal circuit is operating normally a signal is output from T503 5 that is used to supply voltage to the filaments of the tube At this point R550 R529 C531 and C532 filter the signal to a DC voltage This DC voltage is input to 501 3 non inverting input This voltage is com pared to a reference voltage of 8 2 volts This reference voltage is derived by a voltage divider consisting of R533 D520 and D521 As long as 1C501 2 is greater than 501 3 the horizontal circuit is operating nor mally 37 501 2 is also connected to Q503 C Q503 is OFF as long as the signal from the Pin Out circuit is working normally If the Pin Out signal were missing Q504 which is normally ON would turn OFF If Q504 were to turn OFF Q503 would turn ON This would place
48. gy on their existing sets are now available This quote from the FCC web page defines the guidelines that manufacturers of television receivers must fol low No matter what your personal feelings on the ratings issue you will be forced to deal with it as a technician Here you will be given informa tion on what V chip technology is how it is implemented in Sony televi sions and what to do if the customer forgets their password Broadcasters are not required at this time to transmit ratings for their pro gramming At this time however the major networks are broadcasting ratings but all of their affiliates are not In addition many of the popular cable stations are broadcasting V Chip ratings What is V Chip Technology The V Chip system allows broadcasters to send data that contains rat ings The television receiver processes this data and acts according to the programming wishes of the user The user s television has menu options for determining which programs should be blocked These op tions are compared to the data received and programs are blocked ac cordingly Parental Guideline Rating System The ratings can be separated into three categories They are TV Ratings Movie Ratings and Unrated The following table shows the ratings for the three categories TV RATINGS Age based options Block programs by All children iheir rating content TV YT Directed to older children or both TV G General Audience TV PG
49. h C615 T605 1 and 2 T603 1 and 2 through 601 1 C E to ground The voltage applied to 601 1 by T603 4 sustains this current path This voltage at T603 4 is developed by the expanding magnetic field being produced by the current flowing through T603 1 and 2 When the magnetic field in 603 PRT stops expanding 601 1 turns OFF When this occurs a voltage 15 induced by the collapsing magnetic field at T603 3 that turns IC601 2 ON This provides a discharge path for C615 When C609 is fully charged 601 2 will turn OFF This cycle will continue to repeat itself As the voltage across T604 7 and 8 Control Winding changes the inductance of the other windings will change This will determine the frequency of switch ing 15 Soft Start The voltage across T604 7 and 8 Control Winding determines the fre quency of operation The control winding is a cross inductance winding At initial startup the converter has to switch above the optimum frequency of T605 PIT A soft start circuit is used to ensure that this occurs The soft start circuit will ensure that a voltage of approximately 7 volts will be applied across T603 7 and 8 Control Winding After the converter begins to run the voltage from the Vcc Rect line is applied to T603 8 through D612 The voltage applied to T603 7 will then come from the regulator circuit instead of soft start Regulation The frequency of the power supply is dependent on the load that it sees Wh
50. he power switch a 5 volt signal is output from 1 001 62 Tuning Micon O Relay This HIGH is sent to the board via the wiring harness between 1641 on A board and CN641 on the G board This signal is used to turn Q648 ON When Q648 turns ON it places a LOW at its collector This causes RY600 to energize closing the contact and allowing current to flow to D602 Bridge Rectifier The LOW from Q648 C is also applied to the Q646 Backup and Q647 Soft Start transis tors Voltage Doubler D602 Bridge Rectifier is used with C606 C607 D629 and D630 to forma voltage doubler Therefore the output of the voltage doubler is approxi mately 310 VDC This voltage will be referred to as Converter B Con verter B is applied to the converter circuit through R607 R607 is a fusible resistor If the converter circuit draws too much current it will open When RY600 Power Relay is closed a click is heard When the Converter B is applied to the converter circuit it will begin to operate and supply power to the rest of the set 13 Degaussing When the set is turned ON a click is heard from the Power Relay RY600 About one second later another click is heard from RY601 Degauss Re lay After this a loud hum can be heard This indicates that the degauss ing circuit is operating The degaussing circuit operates because every time the set is turned ON a HIGH is output from 001 33 Tuning Micon O HP SEL This HIGH is applied the cable betwee
51. iagnostics and solutions plus the latest information on the V Chip The US models listed below use the AA2W chassis design KV27FV15 KV36FS10 KV32FV15 KV32XBR250 KV36FV15 KV36XBR250 KV32FS10 The following is a list of features that all of these models have FD Trinitronfi Picture Tube Trinitone Color Temperature Adjustment Dynamic Picture Processor Velocity Modulation Dynamic Focus Circuitry Customer Tilt Correction MTS Stereo TV Decoder3 dbxfi Noise Reduction Auto Pedestal Clamp DAC Speaker System Magnetic Quadra Pole Focus V Chip Parental Control SRS 3D Audio Effect 1Front 2Rear A V Inputs Program Palette Presets Vertical Aperture Compensation CaptionVision CC XDS Extended Data Service Steady Sound With BBE The table below shows which features are different between models KV27FV15 KV32 36F KV32 36FS KV32 36XB R250 Audio 15Wx2 Power 2 Tuner PIP Yes Component 1 Video Input Remote N A N A N A Yes Infrared Headphones Comb Filter line 3 line 3 line 3D S Link Yes Yes No Yes significant difference between the 27FV15 model and the rest of the models is the lack of the component input This model will have a much simpler video path because of this 3D Digital Comb Filter analyzes the picture along the three dimensions of height width and time to minimize even subtle picture artifacts 3 Line Digital Comb Filter
52. inputs and outputs their difference The result is output at IC501 7 1 501 5 5 20 5 1 501 6 2 5ms 501 7 5V 5ms 35 This signal is then applied to the base of Q511 Pin Out The signal is inverted by Q511 and then input to the base of Q512 The result is that a PWM waveform is seen at Q512 C Q512 C is connected to the return for the horizontal output When Q512 Pin Out is conducting it allows more current to be drawn by the horizontal yoke The conduction of Q512 is set up so that more current is drawn during the middle edges of the scanning of a horizontal line The result is shown where the output leaves this circuit at R526 The H Protect circuit will remove the horizontal drive signal if the HP pulses are not input to 501 5 This will also occur if Q511 Q512 short Q512 B 2V 5ms Q512 C 50V 20us R526 100V 5ms ABL FROM T503 11 2 FROM 1C355 11 1 135V C520 R506 FROM C510 MAIN HP pogl D536 D535 R523 R327 524 522 R517 Q511 PIN 501 DRIVE J C530 1 2
53. ion Part Number AA 2H AA2 W TLH Plate Gray 2 163 920 11 BA 4C KV 24FV10 TLH Plate White 4 057 714 01 NOTE The two TLH Plates are not interchangeable The TLH plate can be inserted into either the left or right side of the Yoke There is only one plate therefore during alignment the plate must be tried in both sides of the Yoke to determine the most effective adjustment position The alignment procedure for the Yoke replacement can be found in Service Bulletin 38782 TLH Plate Slot right side THL slot left side Reference FPR U0898 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan Nation Service Bu letin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 32XBR250 KV 36XBR250 No 432 Subject Headphone Part Number Missing Date Novemberay 1293 Symptom XXXX The part number for the Headphone MDR IF0230 is not listed in the Service Manual Solution Please add the following part number to the Service Manual REF DESCRIPTION PART NUMBER HEADPHONE MDR IF0230 8 953 742 90 Reference FPR U1120 PRINTED IN USA XI SONY CONFIDENTIAL Sony Service Company 1 1 National Technical Services Se rvice B leti A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV Products Model KV 27FV15 KV 32FS10 KV 32FV15 N 438 KV 32XBR250 KV 36FS10 KV 36FV15 KV 36XBR250 15 1 Subject Control Do
54. l sweeping in the area of blanking but they can be seen in the By Joe Sopko CET Contributed By Jorge Miret And Luis Alberto Tamiet overscanned part of the screen if the vertical height VSIZ in the Menu is reduced slightly This circuit besides to verify the correct operation of the CRT allows to make automatic adjustments within the IC jungle to compensate the small differences of emission between the cathodes and to maintain the correct color of the image The current of the cathodes 15 detected by 3 Detector circuits put in between the exciting amplifiers and each one of the cathodes These circuits send a signal proportional to the current of each one of the cathodes to a IK Buffer circuit from where they are sent to the jungle chip In many equipment these circuits are formed by discrete compo nents transistors diodes resistance etc but in more recent models all the exciting stage of the CRT and the components of IK circuit are included in a single integrated circuit like the TDA6108 Almost from the moment at which the equipment is ignited the jungle chip sends the respective pulses to each one of the output pins while it maintains a cut or muting of video black screen As the cathodes reach the temperature neces sary to emit electrons the current of such generates in the respective detector cir cuits a pulse similar to the applied one and whose amplitude is proportional to the current of th
55. minating brightly The intensity must be similar when doing the test in the three cathodes If some of the colors does not appear or it does in tenuous form it indicated an ex hausted or defective CRT This is not a very precise test It is better to use a Kine Checker but nevertheless this test could aid to determine if some of the guns 1s defective or with very low emission To deactivate or to deceive the IK cir cuit sometimes can be useful The circuit modification below will deceive the IK circuit into deactivating the video blockade that it causes This can be done by disconnecting the line of the IK buffer and placing three diodes of the type 1N4148 between the pins of the inte grated jungle as it is shown in the figure With this modification the pulses from the output of the jungle chip are re introduced into the IK line of the chip which then deactivates the video blockade allowing the image to appear on the screen If the image does NOT appear and having made the verifications given earlier is possible that the inte grated jungle or some component associate is defective Granted The translation leaves a bit to be desired you should have tried reading it before I Helped it along I make no claim to be linguist My parents never even spoke Hungarian around me but I believe that this is more information than we ve ever seen about this IK circuit before Cont Next Page The article th
56. n CN1641 on the board and CN641 on the G board This voltage is used to turn ON Q644 When Q644 is turned ON RY601 is energized causing current to flow from the AC line through THP601 and THP602 When current flows 120VAC is applied to the degaussing coils When this occurs a hum can be heard THP601 and 602 thermistors whose resistance increases as they get warmer The thermistors should read less than 10 ohms when cold The current flowing through them when voltage is applied to the degauss ing coils is great and causes the thermistors to open after a few seconds This stops the action of the degaussing coils since no more current is flowing through them The set will not degauss properly if the set is turned OFF and ON again quickly You typically need to wait at least a few minutes until the thermistors have cooled to degauss again If the degaussing circuit is not operating no hum will be heard when the set is turned ON It is also likely that purity problems will occur since the tube could become magnetized Room vibrations may cause the contacts of RY601 to make contact when they are not supposed to causing the degauss coils to be activated while the set is producing a picture If this occurs the customer may complain about an intermittent rainbow pattern or intermittent loss of purity If a customer complains about this try replacing RY601 IC622 BAOBT R623 STANDBY STANDBY POWER 2 SUPPLY G C
57. n case of a failure that causes the B to rise This voltage is then sent through R652 and output from the G board at CN641 1 and 2 The voltage is used on the G board by the protection and regulation circuits and is also used to produce the 33 volt line on the A board 12 Volts D651 and D652 rectify the signal from T605 7 and 8 This voltage is filtered by C658 and input to 650 12 Volt Regulator 10650 outputs a regulated 12 volts that is filtered by C661 and output from the G board at CN641 8 9 Volts The signal from T605 7 and 8 is applied to D642 through two similar par allel networks consisting of L650 and R670 and L651 and R670 This rectified voltage is then applied to the input of IC641 9 Volt Regulator The output of this outputs 9 6 volts to L652 and also to CN641 6 and 7 Shorted Supply Distribution 21 135 A Board T503 Flyback H Drive Q501 H Out Q502 Pin Amp Q512 WA board VM Drive Q946 12 A Board Q301 HP Buffer 53 SHP All WA board except VM Drive 9 A board TU102 Tuner IC351 VM Mute IC352 YUV Switch IC354 YUV Switch IC355 Y C Jungle 101 D A Converter AK Board 1401 Audio Processor 1403 SRS 01102 Tuner 5 Volt Regulator Board Q1790 IK Buffer UY Board 2006 5 Volt Regulator IC3302 5 Volt Regulator C3304 Chroma Decoder IC3308 YUV Switch UY Board 2005 3 3 Volt Regulator 2006 5 Volt Regulator for tuners The voltage is 9 6 instead of 9 because D647 i
58. nsistors This causes the fusible resistor to open due to excessive current draw The fusible resistor in this case is R607 The symptom in this set is that you hear only one relay click on initial power up instead of three Usually you would hear two the power relay followed by the degaussing relay This would be followed by another click about ten seconds later that indicates the degaussing relay is turned OFF You can check the voltages around IC601 to troubleshoot this problem There would be no voltages present since R607 would be open due to the shorted transistor You should always check the horizontal output for shorts when the con verter transistor has failed It is also a good idea to unload the power supply and bring the line voltage up slow using a variac AA2W Chassis Power Supply Output Voltages Primar Hot Ground Variable AC Input Oscillator Oscillator Voltage Frequenc 145 kHz 48 7V 100 Vp p 145 kHz 63 0V 17 When performing this procedure set your variac to zero Jump the relay contacts Warning By jumping the relay contacts you have defeated the protection circuitry of the power supply Plug the unit into the variac and bring the AC voltage to 30 VAC You should have stable oscil lation at this point Check to see how much current is being drawn from the AC line The current drawn should be minimal since the supply is unloaded Check the voltages at the points in the table below The oscil lator voltage and frequenc
59. of it and if there they have been known to short Sometimes the caps are built into the jungle IC and can still short Many times the IK circuit just goes out of tolerance meaning the current drawn by one crt is no longer within acceptable range and the picture is blanked If this is the case then increasing the screen voltage will solve for a while the complaint Daniel Mundy CET CSM HiFi Buys a Tweeters Etc Company Atlanta GA 30331 The Next Three Pages To Bypass This Circuit Purposes Use at your own Risk The Speaker its Writers and Staff and Nesda of Ohio assume NO responsibility for damage to at time of printing We make no guarantee express or implied of the accuracy efficacy or safety of any of the techniques published It is not intended to replace Manufacturer s Recommendations or good Safety and Troubleshooting practices persons or property as a result of any information printed herein Opinions stated are those of the author and not the Nesda of Ohio Newsletter Opinions stated are believed to be true and are offered in the spirit of helping other servicers but may have no basis in fact Sony IK Circuit Bypass Sony television sets of recent years 1994 95 amp more contain circuits which monitor the current of the CRT cathodes The microprocessor in combination with the jungle chip and a series of transistors and other components in the circuits corresponding to the three cath
60. oils into a magnetic field that positions the election beam vertically Current flowing through the deflection yoke coil is returned to ground through R578 R563 and R559 and TH501 which are in series The thermistor is used for temperature compensation As the vertical yoke draws more current the resistance of TH501 lowers allowing more current to flow to the yokes The voltage developed across these resistors is fed back to the inverting input of 1C561 1 through R566 to improve linearity mM ie be 1C355 13 1V 5ms 1355 14 1V 5ms Rea 1C561 5 20V 5ms 561 3 20V 5ms 1 f s Q562 B 5V 5ms CN501 5 1 5ms 0388 12V SCAN DERIVED gt SEE R537 VI2V 9942 503 8 Bee IC355 15 VM OUT V PROTECT R384 R568 p R387 R561 1 9 21315 0384 R567 C568 R585 TION MTZJ11B R559 3 R578 TH501 VTIM 15V SCAN gt 9536 0530 BOARD 503 7 VERTICAL DEFLECTION 10CTV26 1194 1 4 00 28 29 Failure Relay Clicks Two Clicks Degauss never turns OFF Video Audio Normal
61. or Breakage Mates Noveniber ig 1292 Symptom 161X Weak or broken Control Door hinges Solution If the customer should complain of the above symptom please replace the Control Door Assembly with the new improved part Model Description Part Number KV 27FV15 Control Door Assembly X 4037 631 3 KV 32FS10 Control Door Assembly X 4037 631 2 KV 32FV15 Control Door Assembly X 4037 631 3 KV32XBR250 Control Door Assembly X 4037 631 3 KV 36FS10 Control Door Assembly X 4037 631 2 KV 36FV15 Control Door Assembly X 4037 631 3 KV 36XBR250 Control Door Assembly X 4037 631 3 Reference TV99 09 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan National Technical Sarviogs Service Bu letin A Division of Sony Electronics Inc Park Ridge New Jersey 07656 TV rod ucts Model KV 27FV15 KV 32FS10 KV 36FS10 N 441 KV 32FV15 KV 36FV15 KV 32XBR250 KV 36XBR250 Subject S Link IR Headphone OSD and 3D Comb Dates November 22 1999 Filter Mis Operation Symptom 172X The following Symptoms may occur 1 S LinK When the TV detects the S Link signal in stand by mode TV is supposed to automatically turn on and select appropriate video input It does turn on but it does not select the appropriate input 2 OSD When customer tries to enter password for V chip in Spanish menu customer will see additional unnecessary letters Pr preceding correct OSD 3 Headphone XBR mod
62. pped televisions contain the Parental Control Menu which is located in the Setup section When it is selected the user will be asked for a 4 digit password After this password is entered the user will be asked to confirm it After confirmation the password is set Anytime the user wants to modify the Parental Control Menu the password must be entered Note If the customer forgets their password the master Password 4357 can be entered This allows the customer to reset their password No settings can be changed until a new password is entered When you have entered the password an options menu will be displayed The options are as follows Parental Lock This is used to enable or disable the ratings system This is done by selecting On or Off Rating There are four ratings that can be selected Child The child selection is used to enable only TV Y TV Y7 TV G and G ratings Youth The youth selection is used to enable TV PG and PG ratings Ratings considered lower than these will also be enabled Youth Adult Tthe youth adult selection enables TV 14 and PG 13 ratings in addition to lower ratings Custom The custom selection allows you to tailor the age and con tent ratings to your liking The picture below shows the menu that will be seen when custom is selected TV RATINGS TV Y7 TV G 14 MENU Select category Movel Select Exit Here th
63. raining Department Sony Service Company A Division of Sony Electronics Inc SONY SEL Service Company A Division of Sony Electronics Inc 1 Sony Drive Park Ridge New Jersey 07656 CTV261299 Printed in U S A Features Board Descriptions Picture Tube Defect Symptoms V Chip Introduction What is V Chip Technology Parental Guideline Rating System Parental Control Menu Decoding Power Supply Block Standby Power Supply Converter Operation Regulation Power On Degaussing Power On Degaussing Converter Initial Start Up Soft Start Regulation Troubleshooting Table of Contents 4 _ Soft Start Regulation Foldback Soft Start Regulation Foldback Secondary Voltages 135 Volts 12 Volts 9 Volts 5 Volts Audio B Power Supply Protection 135 Over Current Protection Foldback Vertical Deflection Horizontal Deflection Block Horizontal Out Pincushion H Protect Appendix Service Bulletins 19 19 19 19 21 21 21 21 21 21 25 25 25 27 31 33 35 37 Features Introduction This course covers AA2W chassis Sony direct view televisions These sets are part of the WEGA line which contain the flat screen FD Trinitron picture tubes This course describes the Power Supply Deflection and Protection circuits with a twist of practical troubleshooting tips and known solutions In addition this course reviews picture tube d
64. rtially blanked horizontally Check zener diode D817 RD5 6ESB2 in blanking circuit for leaks Overbright nearly negative picture Access service mode and enter TT07 to clear AUDIO Hum and or buzz of the headphones and or speaker when vol is low Deflection unit generates interference On board A solder side add a thick wire AWG18 200mm long between pins 6 7 and 8 of IC203 and pins 29 and 30 of CN1 Given its critical position the wire must be kept away from board A Part no Ref 190090227 Wire AWG18 No sound Headphones OK Fau t 1 PS6001 O C Replace audio output chip IC1200 TDA7264 Distorted or loud crackling from audio Check audio demodulator processor chip IC202 MSP3410 POWER EHT comes up briefly then nothing No error code Excess current protection system operating Check line output transformer T803 Intermittently switches off when switched on Visible arcing interference on screen when appliance does function Replace line output transformer T803 Locks when hot Replace 12202 MSP3410 Shuts down when hot Replace IC202 MSP3410 FUNCTION No TXT No OSD Check zener diode D817 5 1V on main PCB Comes on then switches to standby Standby LED flashes twice 1 Check field output chip IC500 STV9379 2 OK if D505 disconnected Check zener diode D505 MTZJT7736A for leaks 3 No change 1 D505 disconnected Replace memory chip IC2 Does not got into standby mo
65. rvice in South Euclid Ohio with a Black Screen has sound Turning up the Screen Grid restored the picture so it looked as though this was a candidate to determine the efficacy of that Bypass Mod Seized by the curiosity that marks all technicians I installed the components mentioned in that article from The Speaker As you can see in Figure 1 there are 3 diodes riding like an outrigger on the Photo by Flash Sopko with the new NesdaOhio Digital Camera IT WORKS Jungle Chip CXA1870 Those 3 diodes and a cut of a foil trace on the PCB are all that the mod involves Real Easy Takes only a couple of minutes Figure 2 shows how the diodes are connected schemati cally Be aware that there are different jungle chips involved in different sony chassis Some use the CXA1465 and some use the CXA1870 and I have no doubt that there are others too I have put the affected pin numbers for these 2 chips in figure 2 for your information Also be aware that a particular chassis may use either of 2 chips The chassis that I was working with had the PCB roadmapped for a 48 pin chip but actually had a 42 pin chip installed Needless to say the pin mark ings on the PCB s surface were incorrect Tech s are nothing if not adaptable By Joe Sopko CET I m glad to report that the modification performs as promised BEFORE the Mod the picture would blank at the low end of the screen control would reappear at mid to high
66. s Doors add the washer to the bottom pivots See Fig 3 4 5mm REPLACE 6mm PIVOT 1 SU 36FD2 STAND NEW mm ORIGINAL POSITION of POSITION of EN F PERMANENT is 5 5mm WASHER MODIFICATION TO GLASS DOORS NOT TO SCALE 19mm 3 4 Fig 3 Al SONY CONFIDENTIAL Sony Service Company National Technical Services Se rvice B leti 1 A Division of Sony Electronics Inc csv Park Ridge New Jersey 07656 TV Products Model KV 27FV15 KV 32FS10 KV 32FV15 No 41 7 KV 32XBR250 KV 36FS10 KV 36FV15 KV 36XBR250 Subject Blinking Picture With Local Weather Channel 2314 On the Weather Channel when the program switches from the national to local weather the picture may jump blink or may blank out Solution If the customer should complain about the symptoms above then please check in the Service Mode that VSS 1 If not change VSS to 1 and recheck to verify if the problem is solved if the symptom is still present then change the jungle IC355 on the A Board with the new type below The adjustments for Vertical Horizontal Color and Hue will also needed to be re adjusted Ref Old New Part Number IC355 21315 CXA2131AS T 998 606 67 Reference M Matsuoka FPR U0828 PRINTED IN USA SONY CONFIDENTIAL Sony Service Compan National Technical Servic
67. s connected between the ground pin of IC641 9 Volt Regulator and ground 4 9 Volt Protection The 9 volt line also is monitored for OCP Using the voltage drop across R680 R681 and R644 to control the conduction of Q649 does this When the amount of current drawn on the 9 volt line is sufficient to cause Q649 to conduct Q650 will be turned ON This places a LOW on the inhibit line of IC641 9 Volt Regulator When there is a LOW present at this pin the output of IC641 is disabled 5 Volts The 5 volt line will not be discussed since it is not used in the set Audio B4 The signal from T605 5 and 6 is applied to D641 Bridge Rectifier The negative side of D641 is connected through R643 to ground therefore the Audio B floats slightly above ground level The voltage output from 0641 is filtered by C641 and then sent to CN642 1 and 2 unregulated The audio is used only by the Audio Output Amplifier IC1461 located on the AK board One step in troubleshooting a set that is shut down is to disconnect CN642 If the set still operates then replace IC1461 Audio Output Be sure to discharge the voltage at CN642 1 and 2 before reat taching the connector to CN642 UY5 from IC2006 504 Comb Filter UY5 from 1 3302 IC3307 V Chip IC3303 PIP Processor Audio B 33 AK Board 1461 Audio Output volts 615 gt gt T601 1 PRT T603 PIT
68. tion OVP Over voltage protection is done by rectifying the voltage at T621 6 with D627 This voltage is filtered by C636 and applied to D626 through R638 If this voltage should rise above 6 2 volts D626 begins to conduct When its conduction allows Q622 Protect to turn ON over voltage protection is employed Q622 Protect turns ON and grounds Q621 G which stops the converter from switching D699 is also used for OVP The signal from T621 4 is rectified by D698 This creates a negative voltage across C699 If this negative voltage becomes great enough D699 conducts and the Q621 G voltage is brought lower 11 Secondary Output The power coupled through T621 SRT places a voltage on T621 9 that when rectified and filtered by D628 and C637 is 7 2 volts This voltage is constant due to the regulation circuit on the primary side of T621 SRT This 7 2 volts is applied to Q646 E for backup during the start of regula tion by the regular power supply It is also applied to 622 5 Volt Regulator which regulates its output to 5 volts This 5 volts is sent to CN641 10 which connects to the A board and powers the Tuning Micon and other circuits It is also applied to RY600 Power Relay Checking Q621 Testing a MOSFET device is simple The leads show infinite resistance to each other except for drain to source in one direction because of the presence of a protection diode To prove the device is functional 1 Connect the negative lea
69. tputs a black screen along with the blocked show s rating For example if the Parental Controls are set to Child and the received program is rated TV 14 the screen will be black with TV Rating TV 14 in white letters There is also an additional V Chip IC used on sub tuner video This pre vents blocked programs from being displayed in the PIP window Power Supply Block Overview The power supply in the AA2W chassis is located on the G board AC from the outlet is applied to a series of line filters and protection devices and eventually applied to the standby supply AC rectifier and degauss circuits The Standby supply is a switching supply whose output is ap plied to a 5 volt regulator The output from the regulator exits the G board at CN641 10 It is applied to various components in the set that need to be powered when the set is OFF These include the Micon and the re mote sensor When the set is turned ON by using either the power button or the remote control 5 volts is applied to CN641 11 This 5 volts is used to turn RY600 Power Relay ON When the relay closes a click is heard Closing the relay allows the rectified ac voltage to be applied to the converter circuit The converter begins operation when this voltage is applied The power ON line is also applied to the soft start circuit The soft start circuit holds the voltage low while the power supply filters charge by controlling the voltage present across the control winding
70. y are measured at T603 2 The secondary voltages can be easily checked at CN641 and CN642 Increase the line voltage by ten volts and check each item in the table again Repeat this procedure at 50 and 60 VAC Warning It is not recommended that the power supply be operated unloaded above 60VAC Another problem that may occur is that the switching never starts To troubleshoot this type of problem remove one lead from C615 When you power the set ON you should have a DC voltage of half the Con verter at T603 2 This is where the switching waveform would nor mally be present If the voltage is lower at this point suspect an open related to IC601 2 or leaky component related to IC601 1 If the voltage is high at this point suspect an open related to IC601 1 or a leaky compo nent related to 601 2 Fully unloaded CN641 and CN642 unplugged Secondar Cold Ground A CON Gd 4 5V 18 5V 9 4 BOARD 12V CN1641 SECONDARY CN641 SUPPLIES AUDIO TO AK BOARD CN1463 TO PROTECTION D606 K VCC RECT FROM REGULATOR FROM IC643 4 amp SOFT SOFT START Q645B amp START Q645 E FOLDBACK Q624E FROM BACK UP CONTROL Q646 E WINDING CO NVE RTE R 2CTV26 1186 3 22 00 18 Soft Start Regulation Foldback Overview The three circuits discussed here all have an affect on the voltages across T603 7 and 8 This winding of the PRT is a cross inductance winding or control winding that
71. y the heater pins should have resistance All other pins have infinite pins n limit the resistance to each other and to either heater pins power supply to 1 Amp Used picture tubes that have a heater cathode leakage short have a low Bright red Heater Remove the Replace tube restoration success level green blue Cathode Do not manually Degauss New 27 35 picture tubes are magnetically picture short video input to conditioned for optimum beam landing Strong manual degaussing will One color OR the CRT for destroy this conditioning Applying disc magnets P N 1 452 094 00 to the retrace lines Cathode t the bright bell of the picture tube is the only way to compensate for lost magnetic may be add 9 color If that conditioning The Sony manual degaussing tool can be used to degauss present eher color is still these tubes because of its reduced field intensity P N 7 700 781 01 Retrace lines bright the are diagonal tube is bad lines that run There should from lower left be infinite to the upper resistance right corner between any CRT pin to either Heater in RGB RAINBOW UNREPAIRABLE V Chip Introduction Pursuant to the Commission s rules half of all new television models 13 inches or larger manufactured after July 1 1999 and all sets 13 inches or larger manufactured after January 1 2000 must have V Chip technology Set top boxes that allow consumers to use V Chip technolo

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