Troubleshooting Guide
Contents
1. J No ee Yes Check Replace Are the Audio signal of No Q605 AM line pin28 29 of IC601 normal Yes Check Replace X601 IC601 IC602 Are the Audio signal of pin2 5 of IC651 normal No Yes Check Ro Lo lines Are the Audio signal of pin7 11 of IC651 normal No Yes Check the voltage of pin10 of IC651 Check Replace C660 C664 Speaker NO PICTURE NO SOUND RASTER OK No Does the Auto programme operation Yes No Is the CVBS signal of pin10 fo 1C101 normal Check the voltage 5V 12V 33V of Tuner NG Check Replace 1C101 Yes OK Check Replace ZD182 5V 12V 33V power lines Check IC BUS Go to NO PICTURE Block NO SOUND Block lines SDA SCL OK Check Replace Tuner NO RASTER SOUND OK Abnormal Check the voltage of Normal Abnormal Check Replace T701 Check the voltage of HV Check the Heater pulse of Abnormal SCREEN of CPT pin 9 of T701 Check Replace Normal Normal T701 Check Replace Check Replace CPT Board Connector FR705 FR901 NO PICTURE NO COLOR Is the CVBS signal of pin10 of 1C101 normal2. No Yes Is the CVBS signal of pin16 of 1C201 normal Check Replace 1C101 No Yes Is the CVBS signal of pin 3 of 1C150 normal Check Replace 1C201 No Yes Is the CVBS signal of pin 2 of 1C150 normal Check Replace Q151 No Yes Is the CVBS signal of pin13 of 1C501 normal Check Replace 1C150 No Yes Is the Y signal of pin 27 of 1C501 normal Check Replace Q150 No Yes Are R Y B Y signal of pin 31 32 of IC501 normal Check Replace Ic502 No Yes Are R G B signal of pin19 20 21 of IC501 normal Check Replace 1C502 No Yes Check CPT Board Check Replace 1C501 NO TELETEXT Check the 5V line to be correct Check the voltage 5V of C845 Abnormal Normal Abnormal Check the voltage of C176 Check Replace L154 4 8 5 2V No Check whether video signal is No at pin3 of IC150 or not Check whether video signal is at the pin16 of IC201 or not Check Replace IC201 Yes Yes Check I C BUS lines SDA SCL Check the CVBS line Abnormal OK Check pin19 20 22 23 of IC150 Check Replace 1C150 1C151 Check Replace 1C501 ADJU
3. Test Point TP1 Adjust VL101 1 Connect the measuring equipment to the Main Board as shown in Pol 2 Set RF frequency and output level of RF SIGNAL GENERATOR as shown Table 1 3 Turn on DC power supply 4 Adjust VL101 so that the DC voltage may be indicated 2 6 _0 1Vdc Frequency Modulation Output level 38 9MHz OFF 10mVp p Table 1 SECAM L Adjustment NOTE This adjustment should be performed after PIF adjustment Test Point TP1 Adjust VR101 1 Tune the TV set to receive a SECAM L signal 2 Adjust VR101 so that the DC voltage may be indicated 2 6 _0 1Vdc SECAM L L sound Adjustment Test Point C638 Refer to the Fig 2 Adjust VL102 OSCILLOSCOPE Fig 2 t Noise t MAU Levei HIT F t Before Adjustment After Adjustment 1 Connect the Oscilloscope to the Main Board as shown in Fig 2 2 Set pattern generator as shown Table 2 3 Adjust VL102 so that the Noise level is minimized System Signal Pattern Sound signal Carrier signal SECAM L Color bar Off On Table 2 Vertical Horizontal E W East West Adjustment LINE SVC 1 NOTE These adjustments are already aligned at the time of manufacture for optimum performance Readjustment of them should not be necessary unless IC02 EEPROM is defective Because all the information of these adjustment are memor
4. Te 0 47 ET iw Ai 6 SCREEN l C I d 12V Value of resistor capacitor and inductor NOTICE Since this is basic circuit diagram The value of components and some 1 Resistances are shown in ohm partial connection are subject to K 41 000 Mei 00O OOO change for improvement without notice 2 Unless otherwise noted in schematic All capacitor values less than 1 are expressed in mfd and the values more than 4 in pF 3 Unless otherwise noted in schematic all inductor values more than 1 are expressed in uH and the values less than 1 in Henry H The components marked A conform to VDE or IEC guide lines and are essential for safe operation of the TV receiver While those marked A are required for correct operation Use specified parts only when replacing PRE AMP PAO 4 CX20 106A Observation of voltages and waveforms 1 CPT BOARD Voltages read with VTVM from point to chassis ground line voltage is 230 20 volts Signal pattern is colour bar 2 The schematic shown is represetative only 3 All waveforms are taken using a wide band oscilloscope and a low Capacity probe 4 Check FINE TUNING AGC CONTRAST BRIGHTNESS and COLOUR controls for best picture P9018 C906 4 7 250 R929 470 0 5 make sure that R949 470 0 5 R96 470 0 5 COLOUR and BRIGHTNESS are in mid point and CONTRAST is in 752 5 Waveforms are taken using a sta
5. geometric vertical center of the CPT EW Horizontal Width Adj ust to that a digital circle pattern looks like exact circle EP East west Parabola Adj ver ust so that middle portion of the outermost left and right tical line looks like parallel with vertical lines of the CPT EC East west Corner Adjust so that the vertical line at every 4 corners of the creen looks like parallel with the vertical lines of the CPT ET East west Trapezium Adjust to make the length of top horizontal line same with it of the bottom horizontal line White Balance Adjustment LINE SVC 2 NOTE This adjustment should be performed after screen voltage adjustment 1 Tune the TV set to receive an 100 white pattern 2 Press Number 2 button on remote controller in the SVC Mode press OK button on control board continuously and OK button on remote controller then you can find On Screen Display Refer to the following Fig 4 3 Press PSM RED button on remote controller Standard picture 4 Press PR or PR button for desirous function adjustment 5 Adjust VOL or VOL button for GG31 6 Adjust VOL or VOL button in each status of RG BG for X 288 _8 Y 295 _8 with color analyzer color temperature 9000 K LINE SVC2 1 CH5 RG31 GG31 BG23 DY12 Fig 4 Never change this data this is an important reference data for TV Ref PAL Ur DY15 NOTE If press Number 3 button on the rem
6. 2 control while performing on all over local channels or the voltage at J156 will be 6 4 0 1Vdc in RF level 60 _1dBuV Screen Voltage Adjustment Test Point RK Red Cathode of CPT Board Adjust Screen Control of FBT 1 Tune the TV set to receive a digital pattern 2 Press PSM RED button on remote controller standard picture 3 Connect the probe of oscilloscope to the RK Red Cathode of CPT Board 4 Adjust Screen Volume of FBT so that the waveform is the same as below Fig 6 Focus Adjustment NOTE This adjustment should be performed after warming up for 10 minutes Test Point Observing Display Adjust Focus control of FBT 1 Tune the TV set to receive an inactive channel station 2 Adjust the Focus control of FBT for best overall focus Horizontal Zi FlyBack Time Black level 170Vp p White level GND for de Fig 6 The waveform of RK Red Cathode of CPT Board PURITY amp CONVERGENCE ADJUSTMENT Caution Convergence and Purity have been factory aligned Do not 5 Reconnect the internal degaussing coil attempt to tamper with these alignments However the effects of adjacent receiver components or 6 Position the beam bender locking rings at the 9 o clock replacement of picture tube or deflec
7. ERS ADJUSTMENT VIEWING AREA GREEN 12 While watching the 6 o clock positions on the screen rock the front of the yoke in a vertical up down direction to converge the red and blue vertical lines Fig upper left 13 Temporarily place a rubber wedge at the 12 o clock position to hold the vertical position or the yoke 14 Check the 3 o clock and 9 o clock areas to confirm that the red and blue horizontal lines are converged If the lines are not converged slightly offset the vertical tilt of the yoke move the rubber wedge if necessary to equally balance the convergence error of the horizontal lines at 3 o clock and 9 o clock and the vertical lines at 6 o clock and 12 o clock 15 Place a 1 5 inch piece of glass tape over the rubber foot at the rear of the 12 o clock wedge 16 While watching the 6 o clock and 12 o clock areas of the screen rock the front of the yoke in the horizontal left to right motion to converge the red and blue horizontal lines Fig upper right 3 4 hea LEFT RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE SIZE CHANGE OF THE RED AND BLUE RASTERS ADJUSTMENT VIEWING AREA 17 Temporarily place a rubber wedge at the 5 o clock and 7 o clock positions to hold the horizontal position of the yoke 18 Check the 3 o clock and 9 o clock areas to confirm that the red and blue vertical lines are converged If the lines are not converged sligh
8. ITS MAGNETIC NORTH POSITION 3 If the yoke has the tape version beam bender remove it and replace it with a adjustable type beam bender follow the e Turn the receiver on and obtain a red raster by increasing instructions provided with the new beam bender the red bias control CW and decreasing the bias controls for the remaining two colors CCW 4 Replace the yoke on the picture tube neck temporarily remove the three 3 rubber wedges from the bell of the f Attach two round magnets on the picture tube screen at 3 picture tube and then slide the yoke completely forward o clock and 9 o clock positions approximately one 1 inch from the edge of the mask use double sided tape 8 10 11 12 13 14 15 1 ADJUST YOKE Z AXIS FIRST TO GET EQUAL BLUE COLOR CIRCLES MAGNETS gt RED Referring to above perform the following two steps a Adjust the yoke Z axis to obtain equal blue circles b Adjust the appropriate beam bender tabs to obtain correct purity four equal circles After correct purity is set tighten the yoke clamp screw and remove the two screen magnets Remove the AC power and rotate the receiver 180 degrees facing magnetic south Reconnect the internal degaussing coil Turn the receiver on for 10 seconds make sure the receiver came on to perform internal degaussing and then turn the receiver off Unplug the internal degaussing coil Turn on the receiver and che
9. J802 A F801 ml mm vm mm mm mm mm mm mm rm mm rm mm rm mm rm bm mm rm mm mm pm rm pm rm pm rm mm rm bm rm bm pm rm mm mm pm rm mm rm TO TUNER GND T4 H250V i i 1 A 1 A oo A I zen I 150 982c 151 D02F bi I TVPO6J I I E d e 1 D1354 I D854 S C855 i TVRO6J SE R8541 70854 11 I 2W RS 2128 I I I I D855 1N4148 R01 ene 1 i 10W PWR e a8s2 F I i Ber geet Werer J851 OPTION W ST BY l ix I lt ON OFF JS T Aa D856 1N4003 5v q 12v a804 c3198 Y a801 C3852A S e Ic805 PQOSRF21 270P 500V CK D SW C835 IC351 TDA8350Q 0 SOU 400V D453 RGP15J L453 R457 47K 2W 150 L01J ic ee 270P 500V S SECH CH 250V 777 250V 0 5W H C i D454 Y SE T451 AN pase C455 co 425 022K 4000P nasi 451 CO2B 0 04 CR A740 O 14 A 1 BKV RU4DS 7 5K R702 Ss F AS RS 4W 9 1K 52 C453 Q452 e R704 1W RS 100V C454 ae 0 0033 Ke E Fei 0 5W FB453 Seu D452 C704 125 022K el 4uac 0 047 0 033 R703 D707 200V 400V 4 7K 1N4005GP P N 484 933A S1 2 2 971120 WAVEFORM SOUND VERTICAL HORIZONTAL P803A jaa Kal O N D D832 C7410 1N4148 SET D A 6 015 OSW o 100V AFC EHT AFC ANa T d zD705 0833 3 WT 2 1N4148 SN an l FR705 c707 54 GND d 270P 500V GI 3 45v d D708 Ges d SE mz TVRO6J 0 47 d 100V 0705 nN OLSEN 270P 500V Focus 16v d lt BN SC JE
10. STMENT INSTRUCTIONS A Safety Precautions 1 It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument Never disconnect leads while the TV receiver is on Don t short any portion of circuits while power is on The adjustment must be done by the correct appliances But this is changeable in view of productivity 5 Unless otherwise noted set the line voltage to 230Vac _10 50Hz Test Equipment required 1 RF signal generator with pattern generator 2 DC Power Supply 3 Multimeter volt meter 4 Oscilloscope 5 Color analyzer AUN Main Board Component side view Ne To MULTIMETER Lo 9 MAIN BOARD TDA9811 van mr mr of 19 CH ADJ g 3 TP2 VL102 4 5M ES rl un Se D 62 I VR102 38 9MHz AGC 10mVp p ADJ Y RF SIGNALO d GENERATOR CERAMIC cap qy 2102 zh 10000pF S TP point is on the TUNER foe copper side of PCB TP1 pin23 of C101 O TP2 ping of IC101 540 1Vde TP5 TP3 pin30 of IC101 DC POWER J156 TPS J156 e SUPPLY AGC TP SF Fig 1 Connection Diagram of Equipment for PIF Adjustment PIF Picture Intermediate Frequency Adjustment
11. SYNC eTo IC505 CT PROCESSOR D Za 9 ON OFF i eFrom pin39 I1C351 ABNORMAL 43 VER DRIVE amp E W of IC501 TDA83500 eTo pin8 of IC651 V AMP amp E W S MUTE d IC802 TLP721 From pin10 of FBT T803 SMPS TRANS A OO QOO oo je CH IC803 e e tun It x ZD705 uning voltage 7 5V for Tuner e A ZD182 For IC351 53V e 0000000000000 e E option R IN L IN VIDEO IN IO oO oi voL DK MENU S VHS d ai PR i si pa za ci zs pia O00000 1c153 KC i Lupi 10U ei ei eieiei 6 IC502 TDA4566 ST BY ON OFF e P 8 O O O O E sl R w EXTAL sf Z x01 aM S w 5 O XTAL GE 100 g 58 0 lt 8 IC501 TDA8376 IC503 TDA4665 0000 ei 0000 sv TDA9811 DACA L Ce 100P DACA A Can bai 100P RESET G4 N DAT 3 N CLK Ge FRAME TDA9811 DENON ORORO 7 5 10 146V__1K S DA OUT c631 DvSS Gei 0 04 47 716V DVSUP e e KA e WI Lei y Ki EE c i S DA INGs i i z IIS DA IN Ga o 75 up P ou P GL 2012 PJ101 AUDIO OUT TO CPT EARTH SCART 1 FULL SCART W RGB P N 484 933A S1 1 2 TMENT ORM 971120 SOUND VERTICAL VIF CVBS Freske EXT SOUND HORIZONTAL Seeneew EXT VIDEO HDOO AA IO ei o ei Ei Ei EI HOA lo Gei ei e A MAIN 2 BOARD PRIMARY SECONDARY BGH
12. Troubleshooting Guide NO RASTER Check B voltage at J405 Normal ov Is the voltage at pin8 37 Check Open of IC501 8V No Fuse of AC line Check Replace Check the voltage 5V Yes 12V lines OK Fuse D801 IC801 Does the square ov m waveform from pin40 of Check the voltage of No IC501 appear OK C808 C809 Check Replace y Check I C BUS lines Check Replace Cen es SDA SCL 254 380V D801 Is the waveform of Check the voltage Lower than 6V No collector of Q451 normal of pin9 of IC801 Check Replace Check Replace Yes D802 D805 D807 Q451 T451 R452 Q801 IC801 No Check Replace Q452 Is the waveform of collector of Q452 normal Yes Check Replace T701 Check Replace IC803 D835 D829 Check the 12V 5V lines are shorted NO SOUND PICTURE OK No AM Sound No NICAM or FM Sound NO Check Replace 1C101 Check the Audio signal of pin12 of IC101 normal Check whether Sound system of MENU OSD is correct or not Incorrect Yes Correct Set correct Sound system Check the Audio signal of pin55 of IC601 normal Yes Is the SIF signal of pin20 of IC101 normal
13. ck the purity by holding one 1 round magnet at the 3 o clock and a second round magnet at 9 o clock position If purity is not satisfactory repeat steps 8 through 14 Turn off the receiver and reconnect the internal degaussing coil Convergence Adjustment Caution This procedure DOES NOT apply to bonded yoke and picture tube assemblies Do not use screen magnets during this adjustment procedure Use of screen magnets will cause an incorrect display Remove AC power and disconnect the internal degaussing coil Apply AC Power and set the brightness to the Picture Reset condition Set the Color control to minimum Apply 8V to the pin Adjust the Red Green and Blue Bias controls to get a dim white line Remove the AC power and 8V from the pin 2 ADJUST BEAM BENDER 2 POLE MAGNET TO GET FOUR EQUAL COLOR CIRCLES Reconnect the internal degaussing coil and apply AC power Turn the receiver on for 10 seconds to perform internal degaussing and then turn the receiver off again Unplug the internal degaussing coil Turn on the receiver connect a signal generator to the VHF antenna terminal and apply a crosshatch signal Caution During the convergence adjustment procedure be very careful not to disturb the purity adjustment tabs are accidentally move purity should be confirmed before proceeding with the convergence adjustments Note Make sure the focus is set correctly on this instrument before proceeding w
14. ith the following adjustment 10 Converge the red and blue vertical lines to the green vertical 1i line at the center of the screen by performing the following steps below TABLE a Carefully rotate both tabs of the 4 pole ring magnet simultaneously in opposite directions from the 12 o clock position to converge the red and blue vertical lines b Carefully rotate both tabs of the 6 pole ring magnet simultaneously in opposite directions form the 12 o clock position to converge the red and blue now purple vertical lines with the green vertical line Converge the red and blue horizontal with the green line at the center of the screen by performing the following steps below TABLE a Carefully rotate both tabs of the 4 pole ring magnet simultaneously in the same direction keep the spacing between the two tabs the same to converge the red and blue horizontal lines b Carefully rotate both tabs of the 6 pole ring magnet simultaneously in same direction keep the spacing between the two tabs the same to converge the red and blue now purple horizontal lines with the green horizontal line c Secure the tabs previsouly adjusted by locking them in place with the locking tabs on the beam bender 3 3 ROTATION DIRECTION OF BOTH TABS MOVEMENT OF RED AND BLUE BEAMS OPPOSITE e Q O bpa 06 OPPOSITE OR a pi UP DOWN ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED AND BLUE RAST
15. ized in that IC Adjustment Procedures 1 Tune the TV set to receive a digital circle pattern unless otherwise noted 2 Press OK button on Control Board continuously and OK button on remote controller then you can find On Screen Display Refer to the following Fig 3 3 Press PR or PR button for desirous function adjustment 4 Press VOL or VOL button for correct picture 5 Press OK button to memorize all the adjusted data 6 After finishing adjustment press TV AV button on remote controller then TV is changed from SVC mode to normal mode LINE SVC1l 1 CH5 VL 43 EW 37 VA 21 EP 39 SC 35 EC 29 VS 35 ET 20 HS 21 50HZ This is only displayed according to receiving system PAL SECAM System 50Hz NTSC System 60Hz Fig 3 VL Vertical Linearity Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT VA Vertical Amplitude Adjust so that the circle of a digital circle pattern may be located within the effective screen of the CPT SC Vertical S correction Adjust so that all distance between each horizontal lines are to be the same VS Vertical Shift Adjust so that the horizontal center line of a digital circle pattern is in accord with geometric horizontal center of the CPT HS Horizontal Shift Adjust so that the vertical center line of a digital circle pattern is in accord with
16. ndard colour signal c924 33P 50V Oo amp Gi Of 220 0 5W AS 0944 BF422 470 0 5 RS L941 100U fr Nb 0944 182471 9 0945 BF421 R942 10 c944 33P 50V D A 0961 182471 REMOTE CONTROL BOARD L KC DCD Bee BF421 C964 33P 50V SAA30 10 SCREEN FOCUS ANODE CPT_GND ST BY PRE AMP PR VOL OK MENU P265 P276 P277 P278 P279 P280 P281 pen AN DN PR voL P252A OK MENU C GND RI LI GND VI P2544 CONTROL BOARD PR v L IN VIDEO IN P276 P277 P278 P279 p280 P281 geben geben e de e ebe FUSE T4 0H 250VAC F80 R655 33 0 SW 5V PR VOL OK MENU C GND RI LI GND VI Paora A P252A P254A
17. ote controller in the SVC mode then you can find On Screen Display Refer to the following Fig 5 LINE SVC3 1 CH5 ER 30 NP N10 SP 23 SV 75 Fig 5 Never change these data these are important reference data for TV RF AGC Automatic Gain Control Adjustment Test Point TP5 J156 or Observing Display Adjust VR102 The RF AGC control VR102 was aligned at the time of manufacture for optimum performance over a wide range conditions Readjustment of VR102 should not be necessary unless unusual local conditions exist such as 1 Channel interference in a CATV system 2 Picture bending and or color beats which are unusually due to excessive RF signal input when the receiver is too close to a transmitting tower or when the receiver is connected to an antenna distribution system where the RF signal has been amplified In this case the input signal should be attenuated with pad or filter to a satisfactory level 3 Picture noise caused by broadcast noise or weak signal If the broadcast is clean and the RF signal is at least ImV 60dBu the picture will be noise free in any area Adjusting the VR102 RF AGC control to one end of rotation will usually cause a relatively poor signal to noise ratio Adjusting to the other end of rotation will usually cause a degradation of over load capabilities resulting in color beats or adjacent channel interference For best results adjust the VR10
18. tion yoke may require the position and the other three pairs of tabs 2 4 and 6 pole need to readjust purity any convergence magnets at the 12 o clock position DEFLECTION YOKE 6 POLE PURITY amp CONVERGENCE MAGNETS MAGNET ASSEMBLY PURITY MAGNET 2 POLE LU X AXIS YOKE MAGNE POSITIONING L R P RUBBER L URITY WEDGES PURITY MAGNET 4 POLE GLASS CLOTH TAPE CONVERGENCE MAGNET ASSEMBLY Purity Adjustment This procedure DOES NOT apply to bonded yoke and picture 7 Perform the following steps in the order given to prepare the tube assemblies receiver for the purity adjustment procedure The instrument should be at room temperature 60 degrees F or above for six 6 hours and be operating at low beam current a Face the receiver in the magnetic north direction dark background for approximately 20 to 30 minutes before performing purity adjustments b Externally degauss the receiver screen with the television power turned off CAUTION Do not remove any trim magnets that may be attached to the bell of the picture tube c Turn the television on for approximately 10 seconds to perform internal degaussing and then turn the TV off 1 Remove the AC power and disconnect the internal degaussing coil d Unplug the internal degaussing coil This allows the thermistor to cool down while you are performing the purity 2 Remove the yoke from the neck of the picture tube adjustment DO NOT MOVE THE RECEIVER FROM
19. tly offset the horizontal tilt of the yoke move the temporary rubber wedges if necessary to equally balance the convergence error of the horizontal lines at 6 o clock and 12 o clock and the vertical lines at 3 o clock and 9 o clock 19 Using a round magnet confirm purity at the center right and left sides and corners See Purity Adjustment Procedure 20 Reconfirm convergence and apply a 1 5 inch piece of glass tape over the rubber foot at the rear of the 5 o clock and the 7 o clock wedges PH1601 DOLBY JACK Z103 104 K i i IC602 DPL3519A SAW FILTER DOLBY PRO LOGIC Z101 102 MSP3410 SAW FILTER C10 MSP3400 eTo scart2 eTo scarti RL IF SIGNAL e From u COM a EXT AUDIO IN AUDIO IN From SK201 7 co p A PROCESSOR c rb lt EXT VIDEO IN SCART1 RL GL3812 ees EXT AUDIO IN From SK202 e EXT VIDEO IN SCART2 RL vn ae ISI EC EXT AUDIO IN From front NVM as 69 5 lt EXT VIDEO IN Phone Jack EEPROM ra DATA SW1 5 From pin8 of SCART1 G From pin16 DATA SW2 E j SB of SCART1 From pin8 of SCART2 eege TDA8395 Ke TMENU p SECAM DEC e 36 RESET gt o l0K G WEE Cen P ee CF70203 L H SYNC co TDA8376 CF70209 gt R G B z Ma C1 CHARACTER eme E SE MULTI SC GENERATOR a VIDEO TDA4665 eo pin18 TK DI eFrom pind R G B FB OSD TDA4566 DELAY LINE PROCESSOR TELETEXT option of 1C501 of IC351 V SYNC 48 V
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