SERVICE MANUAL
Contents
1.2. 819 5 P A x m i aen 7 Q g 0 Em 10 n pn mi E Lem p mo m H red Q H Her Bha n 0 5 peg 3 cute eine neta bate c JUC7 B20 This circuit diagram is only for reference 1 Any co
3. H correc SIF in Hor Proc Sync sepa Hor VCO HAFC 1 HAFC 2 H shift Vert Proc V CID V ramp V geometry V Drive PIF Proc PAL NTSC demod Auto VCO alignment gt EXT CVBS Y 8 TVout 2 2 Vpp IF Voc 9 V Fig 13 34 SERVICE MANUAL 4 Block Diagram for TMPA8807 P30 Int3 RXIN P31 Int4 TC3 P63 LED2 P20 nt5 Stop P50 PWM 7 bit TC2 Int P40 PWM 14 bit 22 P51 SCL P52 SDA 69 Gb 6 6 6 69 6 6 6o 69 vo 12 port 14 bit PWM x1 7 PWM 1 8 bit Ext x3 Int x1 Romote preprocessor 16 bit int timer x2 8 bit int timer x2 Watchdog timer Interrupt Ext 5 Int x11 IIC bus interfece Ext x1 Int x1 ROM 32 kB M 48 kB P 56 kB R 64 kB S RAM 2 ROM correction OSD R G B Y BL 1 Font 16 x 18 Display 32 C x 12 L Color 8 uP AVpp 5 V up MPAGND m RGB Vcc 9 V G2 6 60 09 Cut off Drive AKB Black Det D 8009 5V 04 Chroma Proc Character 384 Half tone Test signal Transparent 870X CPU core STOP IDLE mode RGB swil Brightn
4. 2 1 5 until optimal convergence is 2 2 1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting 2 2 2 Temporarily put the first wedge between the picture tube and deflection yoke assembly Move front of the deflection yoke up or down to obtain better convergence in circumference Push the mounted wedge in to fix the yoke temporarily 2 2 3 Put the second wedge into bottom 2 24 Move front of the deflection yoke to the left or right to obtain better convergence in circumference 2 2 5 Fix the deflection yoke position and put the third wedge in either upper space Fasten the SERVICE MANUAL deflection yoke assembly on the picture tube 2 2 6 Detach the temporarily mounted wedge and put it in either upper space Fasten the deflection yoke assembly on the picture tube 2 2 7 After fastening the three wedges recheck overall convergence and ensure to get optimal convergence Tighten the lamp screw holding the deflection yoke assembly 6 POLE MAGNETS 4 POLE ADJUST THE ANGLE MAGNETS VERTICAL LINES TWO TABS AT THE SAME TIME HORIZONTAL LINES CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS Fig 2 4 pole Magnet Movement 6 pole Magnet Movement BLU RED RED BLU GRN RED BLU px Incline the Yoke Up or Down Incline the Yoke Right or Left Circumference Convergence by DEF Yoke Fig 3 3 White Balance Adjustment Generally white balance adjustment
5. 8807 Only AV Switch For TMPA8801 Only 1 for video and 1 for audio monaural 33 SERVICE MANUAL 3 Block Diagram for TMPA8801 P63 LED2 P30 Int3 RXIN P31 Int4 TC3 2 P20 int5 Stop P40 PWM 14 bit P50 PWM 7 bit TC2 Into P51 SCL P52 SDA G 6 6 6 6 6 6 60 63 12 10 port 14 bit PWM x1 7 bit PWM x1 8 bit ADC Ext x3 Int x1 Romote preprocessor 16 bit int timer x2 8 bit int timer x2 Watchdog timer Interrupt Ext x5 Int x11 IIC bus interfece Ext x1 Int x1 ROM 32 KB M 48 kB P 56 R 64 kB S RAN 2 correction P61 LED1 ADC 8 bit P60 ADC 8 bit P53 ADC 8 bit TC1 Int2 050 R G Y BL Font 16 x 18 Display 32 C x 12 L uP 5 V uP MPAGND G 69 Cut off Drive AKB gt o 9 fs i x 09 09 Black Det Monitor out 00 09 5 D gt Color 8 Character 384 Half tone Test signal Transparent 870X CPU core STOP IDLE mode switch Brightness Transparent 8 TINT Chroma Proc F PAL NTSC SECAM Base Band Proc 1H DL Int Ext switch Color Uni color RGB Matrix k Y Proc C Trap Black stretch Y gamma Sharpness uP DVpp 5 V
6. Ports Fig 15 41 SERVICE MANUAL 2 AUDIO POWER AMPLIFIER TDA8943SF TDA8944J 6 W MONO BRIDGE TIED LOAD BTL AUDIO AMPLIFIER 1 General description The TDA8943SF is a single channel audio power amplifier with an output power of 6 W at an 8 O load and a 12 V supply The circuit contains a Bridge Tied Load BTL amplifier with an all NPN output stage and standby mute logic The TDA8943SF comes in a 9 lead single in line SIL medium power package The TDA8943SF is printed circuit board PCB compatible with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Printed circuit board compatible 3 Block diagram SHORT CIRCUIT TEMPERATURE PROTECTION Fig 16 4 Pinning information 42 SERVICE MANUAL 4 1 Pinning MBK941 Fig 17 Pin configuration 4 2 Pin description Table 10 Pin description Symbol Pin Description OUT 1 negative l
7. 20 SERVICE MANUAL MDB high pass corner frequency MDB6C 0x07 No use in simple version 2 20 Hz 3 30Hz 30 300 Hz No use in simple version complementary high pass filter Mdb2dL 0x02 MDB6B MDB low pass corner 5 50 Hz 0x08 frequency 6 60Hz 30 300 Hz No use in simple version Mdb2dh Subwoofer corner corner frequency in 10 Hz steps 0x14 frequency range 50 400 Hz No use in simple version Subwoofer 00 hex loudspeaker channel unfiltered 01 hex a complementary high pass is processed in the loud speaker output channel 02 hex MDB is set to OVERLAP mode Table5 Bus Data item data item data item data item data MODEO 3D GDRV 40 CLTS 40 BSNS 00 MODE1 1F BDRV 40 CLVO 65 MOD 40 MODE2 09 CNTX CLVD 60 STBY 00 MODE3 18 BRTC 40 DEF 01 SVM 00 MODE4 90 COLC 40 AKB 00 VBLK 00 LANG 03 TNTC 48 SECD 18 VCEN 16 BBE 9C TNTCAV 48 HPOS 0C UCOM 00 MDB68 40 COLP F8 VP50 03 VTST 00 MDB6A 30 COLS 40 HIT 27 PYNX 2E MDB6C 0A DCOL 20 HPS 03 PYNN 18 MDB6B 0A SCOL 00 VP60 00 PYXS 22 Mdb2dh 14 SCNT OB HITS 01 PYNS 1E Mdb2dL 02 CNTC 40 VLIN 08 BASC 40 continued 21 SERVICE MANUAL EQU11 64 CNTN 01 VSC 04 BASX 70 EQU12 64 BRTX 25 VLIS 00 TREC 40 EQU13 64 BRTN 15 VSS 00 BALC 40 EQU14 64 COLX 3F HIT69 14 BAS1 64 EQU15 64 COLN 00
8. Blanking Period Picture Period HAFC AFC gain 0 0 3 1 BIT 3 2 in VIDEO mode 0 1 4 7 27 1 O 4 3 1 1 1 Off Off Data Description Blanking Period Picture Period AFC gain 0 0 3 1 BIT 1 0 in TV mode 0 1 4 7 2 7 1 O 4 3 1 1 1 Off Off Volume output data at 1 Volume output data at 25 Volume output data at 50 Volume output data at 100 TA1343 woofer Max No use VCO readjust when Bit 7 0 Enable 1 Disable position select Bit 2 N buzz cancel 0 Nyquist buzz cancel on 1 Off 0 Wide 250kHz AFT sensitivity for channel Bit 1 AFT window SW search 1 Narrow 83kHz for normal operation Bit 0 Over modulation 0 Normal 1 PIF over modulation switch on Bit 5 MIX gain 0 SIF 1MHz convert gain low gain 1 High gain Bit 4 Sync separation 0 Sync separation level 40 1 3696 000 0H 001 1H 010 2H 011 3H AKB pulse position 100 4H 101 5H 110 6H 111 7H 17 continued SERVICE MANUAL R sense G sense B sense Bit PIF frequency 6 5 4 Bit 1 0 AKB mode 00 x 0 00 x 0 00 x 0 20 x 0 5 3F x 1 0 20 x 0 5 3F x 1 0 20 x 0 5 3F x 1 0 001 45 75 MHz 011 38 9 MHz 100 38 0 MHz 00 AKB off 01 ACB cutoff align to targets 10 ADB drive align to targets 11 AKB cutoff drive align to targets 00 Normal 01 Normal Bit 3 2 VCD standby 10 Normal 11 VCD standby 00 Normal 01 Normal Bit 1 0
9. gt 2 Ps Source Select 2 SCARTI SCART Output Select 2 SCART2 Fig 23 Simplified Functional Block Diagram of the MSP34X0G 50 SERVICE MANUAL 7 EEPROM AT24C04 08 16 1 Features Low voltage and Standard voltage Operation 2 7 Vcc 2 7V to 5 5V 1 8 Vcc 1 8V to 5 5V Internally Organized 128x8 1K 256x8 2K 512x8 4K 1024x8 8K or 2048x8 16K 2 wire Serial Interface Schmitt Trigger Filtered Inputs for Noise Suppression Bi directional Data Transfer Protocol 100kHz 1 8V 2 5V 2 7V and 400 kHz 5V Compatibility Write Protect Pin for Hardware Data Protection 8 byte Page 1K 2K 16 byte Page 4K 8K 16K Write Modes Partial Page Writes are Allowed Self timed Write Cycle 10 ms max High reliability Endurance 1 Million Write Cycles Data Retention 100 Years Automotive Grade and Extended Temperature Devices Available 8 lead PDIP 8 lead JEDEC SOIC 8 lead MAP and 8 lead TSSOP Package 2 wire Serial EEPROM AT24C01A 1 128 x 8 AT24C02 2K 256 x 8 AT24C04 4K 512 x 8 AT24C08 8K 1024 x 8 AT24C16 6K 2048 x 8 2 Description The AT24C01A 02 04 08 16 provides 1024 2048 4096 8192 16384 bits of serial electrically erasable and programmable read only memory EEPROM organized as 128 256 512 1024 2048 words of 8 bits each The device is optimized for use in many industrial and commercial applications where low power and low voltage operations are essential
10. IF standby 10 Normal 11 IF standby No use No use No use BIT 3 2 V blanking stop point BIT 1 0 V blanking start point Vertical centering Bit 1 0 Internal ADC Improving NTSC Bit 5 4 3 signal to noise ratio color 18 00 310H 50hz 263H 60hz 01 299H 50hz 254H 60hz 10 295H 50hz 250H 60hz 11 291H 50hz 246H 60hz 00 23H 50hz 22H 60hz 01 33H 50hz 30H 60hz 10 37H 50hz 34H 60hz 11 41H 50hz 38H 60hz 00 32 00 GND 10 B output vailable range 20 0 3F 30 01 R output 11 Monitor RF AGC via ADC continued SERVICE MANUAL No use Normal H SYNC Max Ota 3F Normal H SYNC Min une 3F ASM search H SYNC z 3F ASM search H SYNC Min Qis 3F Bass volume center Bass volume Max Treble volume center Balance volume center BASS IN MUSIC MODE SET Treble in MUSIC mode set Woofer in MUSIC mode set Bass in NEWS mode set Treble in NEWS mode set Woofer in NEWS mode set Bass in THEATRE mode set Treble in THEATRE mode set Woofer in THEATRE mode set TA1343 Max woofer setting The bigger the setting the smaller Max woofer Woofer liner set Prescale FM AM use in simple version Prescale NICAM use in simple version Prescale SCART input No use in simple version NICAM gt MONO level No use in simple versio
11. ede uae 55 REPLACEMENT OF 5 60 APPENDIX 1 CIRCUIT DIAGRAMS 2 FINAL ASSEMBLY DIAGRAMS 3 FIND WIRING DIAGRAMS 4 PRINTED CIRCUIT BOARD LAYOUTS SERVICE MANUAL SPECIFICATIONS Model Number 21E88 Color system PAL NTSC3 58 NTSC4 43 RF system Sound system B G M D K I Video system PAL4 43 NTSC3 58 NTSC4 43 50 60Hz Programs preset 236 0 235 Antenna input 750 unbalanced Picture tube Effective screen dimensions 406 x 305mm Approx Audio output THDs 7 Main channel 3W 3W Power source 220V 50Hz Weight Approx 23 Kg Dimensions 585 x 457 x 484mm Wx Hx D Approx Rated power consumption 87W Designs and specifications are subject to change without notice SERVICE MANUAL SAFETY INSTRUCTIONS AND MAINTENANCE WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE INSTRUCTION BELOW X RAY RADIATION PRECAUTION 1 The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X ray radiation as result of excessive EHT voltage The maximum EHT voltage permissible in any operating circumstances must not exceed the rated value When checking the EHT use the High Voltage Check procedure in this manual using an accurate EHT voltmeter 2 The only source of X RAY radiation in this TV is the CRT The TV minimizes X RAY radiation
12. which ensures safety during normal operation To prevent X ray radiation the replacement CRT must be identical to the original fitted as specified in the parts list 3 Some components used in this TV have safety related characteristics preventing the CRT from emitting X ray radiation For continued safety replacement component should be made after referring the PRODUCT SAFETY NOTICE below 4 Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT anode So ensure that the maximum EHT voltage does not exceed the rated value after service and adjustment SAFETY PRECAUTION WARNING REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY 1 The TV has a nominal working EHT voltage Extreme caution should be exercised when working on the TV with the back removed 1 1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for working on high voltage equipment 1 2 When handling or working on the CRT always discharge the anode to the TV chassis before removing the anode cap in case of electric shock 1 3 The CRT if broken will violently expel glass fragments Use shatterproof goggles and take extreme care while handling 1 4 Do not hold the CRT by the neck as this is a very dangerous practice 2 ltis essential that to maintain the safety of the customer all power cord forms be replaced exactly as supplied from factory 3 Voltage exists between the hot and cold gro
13. 4 Recall Press the RECALL button and the TV will directly skip back to the previous program 25 SERVICE MANUAL 3 On screen display Press the DISPLAY button repeatedly in the TV or AV mode to display the current information on the screen and turn off the display respectively With other OSD pressing the DISPLAY button first can turn it off 4 Volume control 1 Press the VOL VOL buttons to decrease or increase the volume Adjustable range 00 100 2 During normal play press the MUTE button and the sound is eliminated The TV will display a red character on the screen To cancel MUTE you may press the MUTE button again or the VOL buttons 5 NICAM Press the NICAM button to switch the TV among the following mode depending on signals received If without NICAM the button doesn t function 1 If with NICAM bilingual signals received press the NICAM button to switch the TV among the I and II modes 2 If with NICAM stereo signals received press the NICAM button to swith the TV among the and A modes Menus Many operations get start from menu selection When watching TV programs press the MENU button to display menu Use the VOL VOL buttons repeatedly to highlight one of PICTURE SETUP TUNING TIMER and OPTION menus cyclically Use the CH CH buttons to access a menu hand cursor is displayed before the highlighted item the
14. 7 9 6 29 8 1 2VCC comparison voltage bias 0 9 Video output 2 18 7 6 6 09 10 Second SIF signal output 2 03 7 7 6 17 11 Second SIF signal input 2 81 5 2 4 99 12 RFAGC output 0 04 6 1 13 signal output 3 05 7 9 6 2 14 External connection for VCO oscillating LC network 2 76 7 6 15 External connection for VCO oscillating LC network 2 76 7 6 16 Ground 0 0 001 0 00 17 AGC filter 3 13 7 9 6 11 18 Supply voltage input terminal 8 2 1 2 7 19 SIF signal input 3 2 2 1 6 27 20 SIF signal input 3 2 7 6 27 57 SERVICE MANUAL Table 17 Ground Resistance of TMPA8801PSBNG Pins Pin No 1 2 3 4 5 6 Resistance 31 70 31 70 KO 42 87 KQ 0 5 5 KQ 44 25 KO Pin No 7 8 9 10 11 12 Resistance 44 31 KO 0 17 56 KO 0 0 39 79 KO Pin No 13 14 15 16 17 18 Resistance 0 66 KO 39 81 KO 39 85 KO 10 55 KO 12 76 KO 24 70 Pin No 19 20 21 22 23 24 Resistance 24 70 KO 24 67 KQ 24 71 KQ 0 0 24 62 Pin No 25 26 27 28 29 30 Resistance 0 56 KO 24 70 KO 16 65 KO 22 04 KQ 0 3 KO 3 27 KQ Pin No 31 32 33 34 35 36 Resistance 3 29 KO 24 27 KQ 22000 KO 362 3 KO 22000 KO 0 Pin No 37 38 39 40 41 42 Resistance 20 1 KO 22000 KO 22000 0 22000 gt 2000 Pin No 43 44 45 46 47 48 Resistance 13 6 KQ 0 5 KQ 3 6 KQ 223 3 KQ gt 2000 KQ 0 Pin No 49 50 51 52 53 54 Resistance 0 5 KQ 1217 KQ 1396 KO 1352 KO 0 0 Pin No 55 56 57 58 59 60 R
15. CONTRAST 100 characters turn colored SHARPNESS 100 After calling up the menu press the CH CH buttons to select an adjustment and press the VOL VOL or SELECTTI MOVE gt Channel Number buttons to adjust as per the prompt on bottom of the screen Fig 8 Press the LOCK INFO or GAME button to access the related menu and use the way mentioned above to adjust Menu selections are omitted in the following function presentation The buttons on the TV share the same functions with those buttons of the same name on the remote control If your remote control becomes invalid or lost you can use many basic functions by pressing the buttons on the TV Note In the AV mode TUNING menu is not available 26 SERVICE MANUAL Tuning in This section gives descriptions about adjustment of items in the TUNING menu 1 Auto search After selecting ASM in the TUNING menu press the VOL button The TV will search automatically in sequence After auto search the TV will store receivable channels and returns to CH NO 1 Unused channel number is automatically set to BAND SKIP ON Puring search press the VOL button to stop ENE TUNE searching ASM Note During ASM the Color system is generally set to SELECT1 MOVE lt gt AUTO and Sound system to BG Fig 9 2 Search In case the desired channel cannot be preset with the ASM function or you would like to set the desired channels to specific channel numbers
16. The AT24C01A 02 04 08 16 is available in space saving 8 pin PDIP 8 lead JEDEC SOIC 8 lead MAP and 8 lead TSSOP packages and is accessed via a 2 wire serial interface In addition the entire family is available in 2 7V 2 7V to 5 5V and 1 8V 1 8V to 5 5V versions 51 SERVICE MANUAL 3 Pin Configuration 8 lead TSSOP Table 12 8 lead MAP Pin Name Function 0 2 Address Inputs vcc SDA Serial Data w SCL Serial Clock Input ah b SDA WP Write Protect NC No Connect Bottom View Fig 24 8 pin PDIP 8 lead SOIC 4 Pin Description SERIAL CLOCK SCL The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device SERIAL DATA SDA The SDA pin is bi directional for serial data transfer This pin is open drain driven and may be wire ORed with any number of other open drain or open collector devices DEVICE PAGE ADDRESSES A2 A1 A0 The A2 A1 and AO pins are device address inputs that are hard wired for the 24 and the AT24C02 As many as eight 1K 2K devices may be addressed on a single bus system device addressing is discussed in detail under the Device Addressing section The 24 04 uses the A2 and inputs for hard wire addressing and a total of four 4K devices may be addressed on a single bus system The pin is a no connect The 24 08 only uses the A2 input for hardwire addressing and a to
17. for MPAGND Supply Oscillator circuit continued 37 SERVICE MANUAL 55 uP AVDD Power VDD for OSD Oscillator circuit 5V Supply Supply 5 V 56 P56 57 P52 SDA SDA I O IIC bus serial data input output 58 P51 SCL SCL I O IIC bus serial clock input output 59 P50 PWM 7 bit TC2 Int0 IPWM8 output 7 bit D A conversion PWM output TC2 input Timer Counter input INTO input External interrupt input 60 P40 PWM 14 bit IPWM0 output 14 12 bit D A conversion PWM output 61 P20 Int5 Stop INT5 input External interrupt input STOP input STOP mode release signal input 62 P31 Int4 TC3 INT4 input External interrupt input TC3 input Timer Counter input 63 P30 Int3 RXIN INT3 input External interrupt input RXIN input Remote control signal Preprocessor input 64 P63 LED2 LED2 output High current sink open drain output Signal Processor Block Table 9 Pin No Pin Name Function 11 TV AGND GND terminal for Analog block 12 FBP in Input terminal for FBP 13 HOUT Output terminal for Horizontal driving pulse 14 HAFC 1 Terminal to be connected capacitor for HAFC filter This terminal voltage controls H VCO frequency continued 38 SERVICE MANUAL 15 V saw Terminal to be connected capa
18. immediately if any abnormal condition are met such as bad smell belching smoke sparkling abnormal sound no picture sound raster Hold the plug firmly when disconnecting the power cord Unplug the TV set from the wall outlet before cleaning or polishing it Use a dry soft cloth for cleaning the exterior of the TV set or CRT screen Do not use liquid cleaners or aerosol cleaners SERVICE MANUAL ADJUSTMENTS SET UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new picture tube is installed Perform the adjustments in the following order 1 Color purity 2 Convergence 3 White balance Notes The purity convergence magnet assembly and rubber wedges need mechanical positioning For some picture tubes purity convergence adjustments are not required 1 Color Purity Adjustment Preparation Before starting this adjustment adjust the vertical sync horizontal sync vertical amplitude and focus 1 1 Face the TV set north or south 1 2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set 1 3 Operate the TV for at least 15 minutes 1 4 Degauss the TV set using a specific degaussing coil 1 5 Set the brightness and contrast to maximum 1 6 Counter clockwise rotate the R B low brightness potentiometers to the end and rotate the green low brightness potentiometer to center 1 7 Receive green raster pattern signals 1 8 Loosen the clamp
19. is made with professional equipment It s not practical to get good white balance only through manual adjustment For TVs with bus control change the bus data to adjust white balance SERVICE MANUAL CIRCUIT ADJUSTMENTS Preparation Circuit adjustments should be made only after completion of set up adjustments Circuit adjustments can be performed using the adjustable components inside the TV set For TVs with bus control first change the bus data 1 Degaussing A degaussing coil is built inside the TV set Each time the TV is powered on the degaussing coil will automatically degauss the TV If the TV is magnetized by external strong magnetic field causing color spot on the screen use a specific degausser to demagnetize the TV in the following ways Otherwise color distortion will be shown on the screen 1 1 Power on the TV set and operate it for at least 15 minutes 1 2 Receive red full field pattern 1 3 Power on the specific degausser and face it to the TV screen 1 4 Turn on the degausser Slowly move it around the screen and slowly take it away from the TV 1 5 Repeat the above steps until the TV is degaussed completely 2 Confirmation and Adjustment for Voltage Caution B voltage has close relation to high voltage To prevent X ray radiation set B voltage to the rated value 2 1 Make sure that the supply voltage is within the range of the rated value 2 2 Connect a digital voltmeter to the voltage output ter
20. please use the SEARCH function After setting the desired BAND in the TUNING menu select SEARCH and press the VOL VOL buttons The TV searches another lower upper channel To stop search press the MENU button If the selected channel is not the one you want press the VOL VOL buttons again until the desired channel is selected If the TV does not stop searching when finding a channel please use the FINE TUNE function 3 Frequency fine tuning After selecting FINE TUNE in the TUNING menu press and hold down the VOL VOL buttons until you get the best sound and picture effect 4 Skip After auto search there may be some repeated program or inferior signals received Skipping the undesired program position can dramatically quicken channel selection Select SKIP in the TUNING menu then press the VOL VOL buttons to set SKIP ON After the TUNING menu disappears press the CH CH buttons and you will find the channel number skipped If you select the channel number by the Channel Number buttons the channel number has changed to red To resume the channel number that has been skipped repeat the operations mentioned above Then set SKIP OFF 27 SERVICE MANUAL STRUCTURE AND CHASSIS FUNCTION STRUCTURE BLOCK DIAGRAM 1 IF Pro amp VQN01 IF Pro amp SAWF U Remote Remote control Sensor HS0038 Circui for Buttons On The TV EEPROM AT24C16 D702 V230 V231 Fig 10 S
21. protection afforded by them cannot necessarily be obtained by using replacements rated at higher voltages or wattage etc Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols on the circuit diagram and parts list Before replacing any of these components read the parts list in this manual carefully Substitute replacement components which do not have the same safety characteristics as specified in the parts list may create X ray radiation Do not slap or beat the cabinet or CRT since this may result in fire or explosion Never allow the TV sharing a plug or socket with other large power equipment Doing so may result in too large load causing fire Do not allow anything to rest on or roll over the power cord Protect the power cord from being walked on modified cut or pinched particularly at plugs Do not place any objects especially heavy objects and lightings on top of the TV set Do not install the TV near any heat sources such as radiators heat registers stove or other apparatus that produce heat Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and servicing of this TV set Otherwise the resulted damage is not protected by the manufacturer SERVICE MANUAL SAFETY SYMBOL DESCRIPTION f The lightning symbol in the triangle tells you that the voltage inside this product may be strong enough to cause an ele
22. ANUAL MBK936 Fig 19 Pin configuration Table 11 Pin description Symbol Pin Description OUT1 1 negative loudspeaker terminal 1 GND1 2 ground channel 1 Vcc1 3 supply voltage channel 1 OUT1 4 positive loudspeaker terminal 1 n c 5 not connected IN1 6 positive input 1 n c 7 not connected 1 8 negative input 1 1 2 9 negative input 2 MODE 10 mode selection input standby mute operating 45 continued SERVICE MANUAL SVR 11 half supply voltage decoupling ripple rejection IN2 12 positive input 2 n c 13 not connected OUT2 14 negative loudspeaker terminal 2 GND2 15 ground channel 2 Vcc2 16 supply voltage channel 2 OUT2 17 positive loudspeaker terminal 2 TDA8944J Stereo power amplifier Max output power 2x 7W 46 SERVICE MANUAL 4 VERTICAL SCAN OUTPUT STAGE CIRCUIT LA78040 LA78041 Both LA78040 LA78041 are vertical scan output stage power amplifiers But there is a little bit difference between the two amplifiers that is LA78040 has supply voltage of 24V and output current of 1 8Ap p while LA78041 has supply voltage of 30V and output current of 2 2Ap p LA78040 LA78041 Vertical Deflection Output Circuit 1 Features Low power dissipation due to built in pump up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible F
23. Assembly 2 Wired Connector XS161 5 5 g 22 3 Wired Connector XS901 8 gt lt RGB Board Assembly 2 lt m Wired Connector XS402 T XSB06 CRT s Ground Wire Solder i lt Wired Connector XS704 N gt 2 B Wired Connector XS601 XSB08 2 XS702 m a 8 j Degaussing L A Wire Red 2 5 oc 11 a L08dX XS802 Wire Grey Power Switch Assembly PRINTED CIRCUIT BOARD DIAGRAM 1 1082 00 NI 8 5 9 exo 113 SA 1 e GB 496 z 559 PRINTED CIRCUIT BOARD DIAGRAMS 2 9000 O 000009099 ES 25 9 lt 10 TTE PRINTED CIRCUIT BOARD DIAGRAMS 3
24. E 11 7OIRE 14 continued SERVICE MANUAL Black stretch 00 Off 01 Black stretch point 25 IRE 10 5 11 45IRE CLTO Bit 7 Killer off 0 Normal 1 Always killer off Chroma 0 NTSC killer sensitivity 1mVpp Bit 6 P N ID data 1 10mVpp TV amp not Bit 5 C gamma 0 Color gamma off 1 On M Bit 4 3 NTSC matrix Bit 2 1 0 BITO 0 V AGC reference depends on YC VCC BITO 1 V AGC reference depends on integrated regulator 00 USA 105 degree 01 Japan 93 degree 10 DVD 11 000 40 nsec 001 0 010 40 nsec 011 80nsec 100 120nsec 101 160 nsec 110 200 nsec 111 240 nsec No use 00 3usec 10 O1F 3usec 0 V phase delay 0H T TH 00 50 20 096 3F 50 Adjusting difference between horizontal cente V phase 60Hz rs in PAL and NTSC 0 V phase delay 0H 7 TH Adjusting difference between vertical amplitudes in PAL and NTSC V linearity V S correction 0 15 8 096 F 1596 0 16 8 096 F 1696 15 continued SERVICE MANUAL Adjusting difference between vertical linear in PAL and NTSC Shift data of 50 Hz 60 Hz Correction IF mute RFAGC RF AGC 654 100dBu 16 continued es 5 Data Description
25. FILE NO SM CTV O 081 COLOR TELEVISION RVICE MANUAL MODELNO 21E88 CHASSIS NO CN 18EA Please read this manual carefully before service TABLE OF CONTENTS SPECIFICATIONS n usss ka 1 SAFETY INSTRUCTIONS AND 2 X RAY RADIATION PRECAUTION 2 SAFETY PRECAUTION CS S Su aD uu tinc cities ls iesu 2 PRODUCT SAFETY NOTICE ete da etie ad qii aaa un 3 SAFETY SYNBOL DESCRIPTION iactis 4 MAINTENANCE 4 ADJUSTMENT teeth mn a uda 5 SETUP ADJUSTMENT Sorun anae ct uto ans 5 CIRCUIT ADJUSTMENTS ea meh petu dd rea ire D te 8 CONTROL BUTTONS inet ote ee ee 23 CONTROL B UPTONS siesta ek 23 REMOTE CONTRO Y u atenta cite esc 24 BASIGFUNCTIONS tte plastica tate ut 25 STRUCTURE AND CHASSIS FUNCTION DESCRIPTION 28 STRUCTURE BLOCK DIAGRAM Z tette toss iu apu Saa m ets 28 BLOCK DIAGRAM FOR SUPPLY VOLTAGE 5 29 CHASSIS DESCRIPTION tetto pep titu id eae RU ted 30 SERVICE eon pu be eum e eH pea 31 TECHNICAL DATA OP KEY TOS desees iude teta atleti te eei eic 31 SERVICE DATA GOE KEY ICS
26. HIT69S 01 BAS2 20 EQU21 4B TNTX 28 SBY 05 BAS3 50 EQU22 19 TNTN 28 SRY 0C TRE1 64 EQU23 4B ST3 25 BRTS 00 TRE2 20 EQU24 19 SV3 30 RAGC 20 TRE3 50 EQU25 4B ST4 25 HAFC 09 WFL1 64 EQU31 32 5 4 30 V01 37 WFL2 00 EQU32 4B SVD 30 V25 60 WFL3 64 EQU33 32 ASSH 07 V50 6F WON1 01 EQU34 4B SHPX 3F V100 WON2 00 EQU35 32 SHPN 20 woofer 60 FVOL 0A OSDF 64 TXCX 3F STAT 00 NVOL 5F OSD 20 RGCN 1F FLGO 06 EVOL 18 OPT 60 ABL 37 FLG1 08 NICL 0A RCUT 40 DCBS 13 REFP 00 NICH 17 GCUT 38 CLTO 66 RSNS 00 NOIS 01 BCUT 35 CLTM 63 GSNS 00 VATT 70 Notes The data sheet may differ dependent on different models Q The data sheet may differ dependent on different CRTs for the same model The data marked with can be adjusted 22 SERVICE MANUAL CONTROL BUTTONS 1 CONTROL BUTTONS Frontpanel TWAV MENU VOL MENU CHANNEL DOWN UP TV AV SELECT VOLUME 4 lt sa DK 9 m POWER INDICATOR MAIN POWER SWITCH INFRARED SENSOR AV IN on the side panel Fig 5 Front panel Rear panel S VIDEO IN Fig 6 Rear panel 23 SERVICE MANUAL 2 REMOTE CONTROL STANDEY Channel Nurnbar TAV SELECT DGT SELECT MERU SELECT CHANNEL DOWN UP VOLUME DOWN UP DN SCREEN DESPLAY SOUND MODE SELECT RECALL PICTURE WOCE SELECT FAVO
27. IN2 NC 0 07 7 3 5 31 19 NC 0 20 RESETQ 4 76 7 5 24 21 DACA R NC 0 8 3 5 3 54 22 DACA L NC 0 08 3 5 3 52 23 VREF I 0 01 0 001 0 00 24 DACM R 0 17 3 5 3 52 25 DACM L 0 08 3 5 3 54 26 DACM SVB NC 0 18 3 6 3 6 27 SC2 OUT R NC 3 82 7 1 5 92 28 SC2 OUT L NC 3 82 7 1 5 91 29 CREF 1 0 01 0 001 0 00 30 SC1 OVT R 3 82 7 1 5 91 31 SC1 OUT L 3 82 7 1 5 92 32 SAPL A 7 19 7 1 6 04 33 AHVSUP 8 1 3 4 59 34 CAPL M 7 2 7 1 6 04 35 AHVSS 7 2 7 1 0 00 36 ABNDC 0 01 0 001 6 02 37 SC3 ZN L NC 3 74 7 1 6 1 38 SC3 IN R NC 3 77 7 1 6 1 39 SC2 IN L NC 3 77 7 1 6 1 40 SC2 IN R NC 3 77 7 1 6 1 41 SC1 IN L 3 77 7 1 6 1 42 SC1 IN R 3 77 7 1 6 1 43 VREFTOP 2 6 1 6 1 63 44 WONO IN NC 3 78 7 6 1 45 AVSS 0 01 0 001 0 00 46 AVSVP 4 9 0 7 4 53 47 ANA IN1 1 53 7 3 5 27 Continued 56 SERVICE MANUAL 48 ANA IN1 1 53 7 3 5 26 49 ANA IN2 0 09 7 3 5 27 50 TESTEN 0 01 0 001 0 00 51 XTAL 2N 2 35 6 8 5 27 52 XTAL OUT 2 36Hs 6 8 5 3 Table 16 Functions and Service Data of TDA9808T Pins Digital Multimeter Pin No Function Description Reference Positive Negative Voltage V Resistance 20KQ Resistance 20KQ 1 PIF signal input 1 3 23 7 2 6 03 2 PIF signal input 2 3 23 7 2 5 99 3 RFAGC start control level adjust 0 99 6 7 5 85 4 PLL APC filter 2 53 7 9 6 3 5 Audio AGC filter 3 29 7 8 6 17 6 Audio output NTSC 4 5 2 2 34 7 2 5 86 7 Filter 1 79
28. PSDNG NTSC 64K 48K 32K Yes SDIP56 CPDNG CMDNG TMPA8801 8807PSBNG is applied in the chassis as an important TV signal processing chip 31 SERVICE MANUAL TMPA8801 8807CMBNG CPBNG CRBNG CSBNG MCU AND SIGNAL PROCESSOR FOR A PAL NTSC SECAM TV The TMPA8801 8807CMBNG CPBNG CRBNG CSBNG is an integrated circuit for a PAL NTSC SECAM TV A MCU and a TV signal processor are integrated in a 64 pin shrink DIP package The MCU contains 8 bit CPU ROM RAM I O ports iD timer counters A D converters an on screen display controller Weight 8 85 g typ 9 wi que ae 27722 remote control interfaces IIC bus interfaces and the Closed Caption decoder The TV signal processor contains PIF SIF Video Fig 12 multi standard chroma Sync RGB processors MROM TMPA8801 8807CMBNG ROM 32k TMPA8801 8807CPBNG ROM 48k TMPA8801 8807CRBNG ROM 56k TMPA8801 8807CSBNG ROM 64k OTP TMPA8801 8807PSBNG ROM size 64k Weight 8 85 g typ 32 SERVICE MANUAL 2 Features MCU High speed 8 bit CPU TLCS 870 X series Instruction execution time 0 5 TMPA8801 8807 CMBNG 32 Kbytes ROM 2 Kbytes RAM TMPA8801 8807CPBNG 48 Kbytes ROM 2 Kbytes RAM TMPA8801 8807CRBNG 56 Kbytes ROM 2 Kbytes RAM TMPA8801 8807CSBNG 64 Kbytes ROM 2 Kbytes RAM ROM correction 12 1 0 ports 14 bit PWM output 1 ch for a voltage synthesizer 7 PWM output 1 chan 8 bit A D c
29. RITE FFIOGFAM ZOOM CHANNEL SCAM AUTCOIntelliqant GAME SLEEP INFORMATION SETUP CALENDAR LOCK SETUP 28 d Fig 7 Remote control Notes 1 When in operation please point your remote control directly to the infrared sensor 2 Do not expose the remote control to impacts water or disassemble it 3 Do not repeatedly press the buttons on the remote control Allow interval of no less than two seconds 24 SERVICE MANUAL 3 BASIC FUNCTIONS Power On Off 1 Memory power on Plug in the supply socket and press the MAIN POWER SWITCH on the TV The TV enters the former mode before Power off i e the TV directly enters the TURN ON mode if in the TURN ON mode before power off or enters the STANDBY mode if in the STANDBY mode before power off In this case you may press any of the POWER CH CH 0 9 buttons on the remote control on the TV to turn on the TV 2 Power off When the TV in the TURN ON mode press the POWER button to shift the TV to the STANDBY mode press the MAIN POWER SWITCH directly to power off the TV at once Part of circuit on the TV remains active in the STANDBY mode To cut off the power off completely please press the MAIN POWER SWITCH Note Avoid switching the TV on and off frequently Doing so may shorten life span of internal components General Operation 1 Intelligent operation By this function the TV can
30. accomplish many important operation and settings which is convenient for your operation 1 Press the AUTO button and hold it for 2 sec so that the TV automatically completes some settings Such as settings for color sound systems picture sound modes and volume 2 After completion the screen message ASM is displayed At this time press the AUTO button again and the TV enters the ASM mode It returns to CH No 1 after ASM You may watch the TV program now If with TUNING LOCK ON the screen message ASM will not appear and ASM doesn t begin 2 Channel selection 1 Pressing the buttons can select another lower numbered or upper numbered channel 2 Direct selection select a one digit channel number Press the button to choose firstly then press one of 0 9 buttons select a two digit channel number Press the button to choose firstly then enter a first digit and second digit select a three digit channel number Press the button to choose firstly then enter a first digit second digit and third digit Note Each digit should be entered at 3 sec time interval 3 Program scan Press the SCAN button and the SCAN OFF appear on the screen Press the button again and the TV begins to scan from the current channel To stop scan and start the corresponding operation press any other buttons The channel skipped cannot appear on the screen during scan
31. al connection 4 OSD G Mto S OSD signal connection 5 OSD B M to S OSD signal connection 6 OSD Y BL M to S OSD display control 7 OSD I CS OUT M to S OSD half tone control Test pattern signal 8 C Video S to M Composite video signal from internal video switch for CCD 9 C Sync S to M Composite sync signal from sync Separator for CCD 10 HD S to M Horizontal timing pulse regenerated from FBP for OSD 11 VD S to M Vertical timing pulse from sync Separator for OSD 12 CLK MtoS 8 MHz clock 13 AVDD Mto S Reference voltage for C Video interface 14 ADC S to M A D converter monitoring RF AGC R Y and B Y Functions of SP from MCU are controllable through the IIC bus of the internal connections 5 2 Power Supply TMPA8801 8807 has some power supplys and GND pins Power supplies related MCU must be applied at the first Power supplies for H VCC and TV D VCC are the second with at least 100 ms delay after MCU power ON The other power supplies are the last which are recommended to be supplied from a regulator circuit using FBP 5 3 Crystal Resonator TMPA8801 8807 requires only one crystal resonator in stead that a conventional two chip solution requires two resonators at least one for MCU and the other one for SP An oscillation clock with the crystal resonator of TMPA8801 8807is supplied for MCU operation PIF VCO automatic alignment alignment free AFT chroma demodulation and horizontal oscillation The oscillation frequ
32. are present inside the TV Extreme caution should be exercised when working on the TV with the back removed 4 1 After removing the back cover look for the FBT on the main PCB There should be a FCB on the FBT 4 2 Power on the TV and preheat it for 15 min 4 3 Receive a normal TV signal Rotate knob of the FCB until you get a sharp picture Before Adjusting After Adjusting Fig 4 5 Safety Inspection 5 1 Inspection for insulation and voltage resistant Perform safety test for all naked metal of the TV Supply high voltage of 3000V AC 50Hz limit current of 10mA between all naked metal and cold ground Test every point for 3 sec and ensure no arcing and sparking SERVICE MANUAL 5 2 Requirements for insulation resistance Measure resistance between naked metal of the TV and feed end of the power cord to be infinity with a DC 500 high resistance meter and insulation resistance between the naked metal and degaussing coil to be 20 6 SERVICE mode To enter the DESIGN SERVICE mode 9 at Set the volume to 0 Then press and hold the MUTE button on the remote control and press the MENU button on the TV to enter the SERVICE mode In this case red S is displayed on the upper center of the screen To exit from the S mode turn off the TV set by the POWER button on the remote control Caution The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicin
33. citor to generate V saw signal V saw amplitude is kept constant by V AGC function 16 V OUT Output terminal for Vertical driving pulse 17 VCC terminal for DEF circuit Supply 9 V 18 For TMPA8801 Connect to GND via resister YS in Terminal for switching of PIP mode For TMPA8807 ER PIP signal YUV input 1 75 Main signal TV EXT YC GND Ys voltage 19 Cb input Input terminal for Cb signal 20 Y input Input terminal for Y signal Input level 1 Vp p 21 Cr input Input terminal for Cr signal It is recommended that input impedance is low 22 TV DGND GND terminal for Digital block 23 CIN Input terminal for Chroma signal 24 EXT CVBS Y V2 IN Input terminal for Video signal Input level 21 Vp p 25 TV DVCC VCC terminal for Digital block This terminal voltage is clipped about 3 3 V by regulator circuit Supply TV DVCC voltage from HVCC 17 voltage 270 26 TV IN Input terminal for Video signal V1 in Input level 1 Vp p For 8801 fsc out Output terminal for fsc wave signal For TMPA8807 Output level 0 55Vp p typ 27 ABCL Input terminal for ABL ACL control 28 AU out Output terminal for Audio signal For 8801 Ew out Output terminal for East West correction signal For TMPA8807 29 IF VCC 9V VCC terminal for IF circuit Supply 9 V 30 TVout Output terminal for detected PIF signal Output level 22 2 Vp p 31 SIF out Output terminal for detected SIF signal 32 EXT AU i
34. ctric shock Extreme caution should be exercised when working on the TV with the back removed A This is an international hazard symbol telling you that the components identified by the symbol have special safety related characteristics FDA This symbol tells you that the critical components identified by the FDA marking have special safety related characteristics UL This symbol tells you that the critical components identified by the UL marking have special safety related characteristics C UL This symbol tells you that the critical components identified by the C UL marking have been evaluated to the UL and C UL standards and have special safety related characteristics VDE This symbol tells you that the critical components identified by the VDE marking have special safety related characteristics MAINTENANCE 1 Place the TV set on a stable stand or base that is of adequate size and strength to prevent it from being accidentally tipped over pushed off or pulled off Do not place the set near or over a radiator or heat register or where it is exposed to direct sunlight Do not install the TV set in a place exposed to rain water excessive dust mechanical vibrations or impacts Allow enough space at least 10cm between the TV and wall or enclosures for proper ventilation Slots and openings in the cabinet should never be blocked by clothes or other objects Please power off the TV set and disconnect it from the wall
35. cture correction featuring high integration compact circuit with fewer external components The chassis widely used in small and medium TVs high performance to price ratio and high reliability and provides much more convenience for manufacturing and technical service It includes 2IN1 IC TMAP8801PSBNG for PAL NTSC SECAM small signal processing and bus control EEPROM AT24C16 for data memory e 1478040 for vertical output power amplifying TDA8944J stereo TDA8943SF mono for audio power amplifying TDA9808T combined with MSP3410G into NICAM IGR demodulator e Thick film IC STR G5653 for power circuit adjustment and control The following features are available in the chassis Color systems PAL NTSC SECAM Sound systems D K B GIM 236 programs preset e Multilingual on screen display bus control NICAM IGR AV stereo e Selectable picture sound modes Intelligent lock Message board e Telephone directory Game e Biorhythm Calendar inquiry The chassis mainly uses the following ICs and assemblies Table 5 Key ICs and Assemblies d Position Type Description 1 D702 AT24C16 EERPOM 2 N201 TMPA8801PSBNG 201 Small signal micro control unit MCU 3 N301 TDA8943SF TDA8944J Audio power amplifier 4 N601 LA78040 Vertical scan output stage circuit 5 N801 STR G5653 Switch mode power supply control 6 NN01 TDA9808T Audi
36. e standard recommended by the Broadcast Television Systems Committee BTSC The DBX noise reduction or alternatively MICRONAS Noise Reduction MNR is performed alignment free 2 Block Diagram Sound IF1 ADG modulator processing Sound IF2 Other processed standards are the Japanese FM FM multiplex standard EIA J and the FM Stereo Radio standard Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA J The MSP34X0G has optimum stereo performance without any adjustments All MSP34X0G versions are pin and software downward compatible to the MSP34X0G The MSP34X0G further simplifies controlling software Standard selection requires a single transmission only The MSP34X0G has built in automatic Functions The IC is able to detect the actual sound standard automatically Automatic Standard Detection Furthermore pilot levels and identification signals can be evaluated internally with subsequent switching between mono stereo bilingual no interaction is necessary Automatic Sound Selection The ICs are produced in submicron CMOS technology The MSP34X0G is available in the following packages PLCC68 PSDIP64 PSDIP52 PQFP80 and PLQFP64 Loud speaker Processing Subwoofer Headphone o Sound Headphone 1251 gt Processing 1252 o SCART1 SCART2 SCART3 SCART4 MONO gt Prescale
37. ency is very important so that those 36 SERVICE MANUAL of functions work properly so that designing the oscillation frequency accurately is required The spec of crystal is recommended to be within fosc 8 MHz 20 ppm ftemp 8 MHz 40 ppm 20 C to 65 C While RESET of MCU is active the MCU function stops Hardware and software initialization sequence including power supplies control is required because status of any hardware after the RESET period is unknown especially horizontal oscillator which is a very basic timing generator of SP operation 6 Terminal Interface MCU Block Table 8 Pin No Pin Name Interface Ci Function 1 P61 LED1 ADC 8 bit IKWU5 input Key on wake up input AIN5 input A D converter analog input LED1 output High current sink open drain output 2 P60 ADC 8 bit IKWU4 input Key on wake up input AIN4 input A D converter analog input 3 P53 ADC 8 bit TC1 Int2 KWUO input Key on wake up input AINO input A D converter analog input TC1 input Timer counter input INT2 input External interrupt input 4 uP DVSS Power GND Supply 5 Reset Reset signal input watchdog timer output Address trap reset output 6 XOUT Output X tal connecting pins 7 XIN Input 8 TEST Input Test pin for out going test Be tied to low 9 uP DVDD Power VDD 5V Supply Supply 5 V 10 uP VVSS Power GND for Slicer circuit Supply 54 uP Power GND
38. ended 1 No DVD option 1 No 0 Yes Recommended Step length setting for lighting up 1 Large step Recommended 005 mall step gradually during power on continued 11 SERVICE MANUAL Option bit for default language by BIT 3 0 Chinese 1 English AUTO button and initialization BIT 2 PWM output option 0 No 1 Yes BIT 1 Instant on 1 Yes No BITO AV Switch 4053 option 0 No 1 Yes Audio processing IC SOUND BIT 7 0 No 1 Yes menu BIT 6 Woofer option in SOUND menu 0 No 1 Yes BIT5 TA1343 option 0 No 1 Yes BIT 4 MSP3410G option NICAM 0 No 1 Yes MODE4 BIT 3 NJW1161 option SRS IC 0 No 1 Yes NJW1160 option BBE IC amp SRS BIT2 0 No 1 Yes IC BIT 1 NJW1137 option BBE IC 0 No 1 Yes BITO Soft IIC option 0 No 1 Yes Bit 7 Nouse 0 PIF VCO functions PIFVCO 10 during auto search and search Bit 6 VCO adjustments 1 PIFVCO 10 during tum on and PIFVCO 00 in Normal mode Bit 5 Nouse Large amplitude AFT switch when no Bit 4 1 Off 0 On signal 927mVrms at 25kHz dev Bit 3 Audio gain switch 10 500mVrms at 25kHz dev 12 continued SERVICE MANUAL Bit Y MUTE 0 No 1 Yes Bit No use Bit No use OSD Horizontal position of 0S D RCUT R cut off GCUT G cut off BCUT B cu
39. esistance 52 60 KO 62 KO 60 8 KO 22000 gt 2000 Pin No 61 62 63 64 Resistance 56 6 83 80 9 KQ Note Measured when Power off 58 SERVICE MANUAL Table 18 Operating Voltage of TMPA8801PSBNG N201 s Pins 1 2 3 4 5 6 5V 5V 5 2V GND 5V 2 3V 7 8 9 10 11 12 2 3V GND 5V GND GND 1V 13 14 15 16 17 18 1 6V 6V 4 2V 4 8V 8 4V 2 0V 19 20 21 22 23 24 2 4V 2 4V 2 4V GND OV 2 3V 25 26 27 28 29 30 3 4V 2 4V 4 8V 3 5V 9V 5V 31 32 33 34 35 36 1 8V 4 4V 2 8V 2 2V 2 5V 5V 37 38 39 40 41 42 2 2V 4 4V 4 2V GND 1 7V 1 7V 43 44 45 46 47 48 4 2V 5V 1 2V 1 8V 2 5V GND 49 50 51 52 53 54 9V 2 5V 2 5V 2 5V GND GND 55 56 57 58 59 60 5V 0V 5V 5V 5V 4 9V 61 62 63 64 4 1V 5V 5V 0V Table 19 Functions and Service Data of LA78040 78041 Pins GDM8145 Multimeter Pin No Function Description Volta obo o ge of Measure with red probe Measure with black probe Pin V while grounding black while grounding red probe probe 1 Ground 0 0 0 2 Vertical output terminal 9 73 0 58 0 58 3 Pump supply voltage input 24 88 oo 4 In phase terminal 2 22 1 30 1 30 5 Inverting input terminal 2 22 4 58 4 55 6 Supply voltage 24 13 1 55 1 55 7 2 output vertical 2 61 7 09 5 93 59 SERVICE MANUAL REPLACEMENT OF PARTS 1 DESCRIPTION Many electrical and mechanica
40. ess Half tone Transparent C BPF PAL NTSC SECAM 1 H DL Int Ext switch Color Uni color RGB Matrix Base Band Proc TINT Y Proc C Trap Black stretch Y gamma Sharpness 83 2 Audio out IF AGC a E a 68 2 PIF PLL 5 Sy 69 H correc SIF in dcm AGC DET Hor Proc Sync sepa Hor VCO HAFC 1 HAFC 2 H shift Vert Proc V CID V ramp V geometry V Drive PIF Proc PAL NTSC Auto VCO alignment P61 LED1 ADC 8 bit P60 ADC 8 bit PS3 ADC 8 bit TC1 Int2 uP DVpp 5 V IF Vcc 9 V Fig 14 35 SERVICE MANUAL 5 Basic Structure 5 1 Internal Connections TMPA8801 8807 has two pieces of IC chip in one package using Multi Chip Package MCP technology One is a micro controller MCU and the other one is a signal processor SP for a color TV There are some internal connections between these two ICs for handling below signals Table 7 Signal Name Direction Description Signal Name Direction Description 1 SCL MtoS Internal IIC bus SCL 2 SDA Bi direction Internal IIC bus SDA 3 OSD R Mtos OSD sign
41. g As the control data have dramatic effects on functions and performance of the TV service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings 6 2 Adjustments and bus data 08 0603 Table 3 Function Description for Bus Data Audio system options available during auto search and use of AUTO button SECAM gate pulse width 2 2 usec SECAM 2 0 usec Bit4 INHIBIT 1 8 usec MODEO SECAM demodulation inhibit When changing channels Bit3 V MUTE 0 Y MUTE 1 RGB MUTE SECAM 0 No 1 Yes AUTO2 0 PAL 1 Without PAL 0 Memory on 1 Soft on continued 10 SERVICE MANUAL Write in LOGO 0 No 1 Yes NICAM DK for CHINA 0 No 1 Yes With two sets of terminals Bit5 Yes Recommended refresh AV terminals Screen saver 0 No 1 Yes 0 No 1 Yes 0 No 1 Yes Bit1 0 No 1 Yes B G 0 No 1 Yes Rem Small character processing 0 New program Recommended Bit6 program 1 Old program RF NTSC options 0 No 1 Yes Power on message display 0 No Recommended NICAM sound with MDB 0 No 1 Yes O No Bit 1 Single language 1 Yes TA1343 woofer or MDB output 0 Mono output 1 Overlapped to main mode options channel Recommended Childlock vertical bug processing 0 Yes Recommended 1 No Horizontal AFC bug processing 0 Yes Recomm
42. ig 20 2 Block Diagram Package Type TO 220 7H THERMAL PROTECTION GND Ver OUTPUT N OUTPUT STAGE Veo m NON INPUT INVERTING INPUT PUMP UP QUT Fig 21 47 SERVICE MANUAL 5 TDA9808T SINGLE STANDARD VIF PLL WITH QSS IF AND FM PLL DEMODULATOR 1 Features 2 General Description 5 supply voltage 9V supply voltage for The TDA98068T is an integrated circuit for TDA9808T DIP20 only single standard negative modulated vision Applicable for IFs Intermediate Frequencies of IF signal processing and FM demodulation 38 9MHz 45 75MHz and 58 75 MHz with single reference QSS IF in TV and VTR Gain controlled wide band Video IF VIF sets amplifier AC coupled True synchronous demodulation with active carrier regeneration very linear demodulation good intermodulation figures reduced harmonics excellent pulse response Robustness for over modulation better than 105 due to Phase Locked Loop PLL bandwidth control at negative modulated standards VIF Automatic Gain Control AGC detector for gain control operating as peak sync detector Tuner AGC with adjustable TakeOver Point TOP Automatic Frequency Control AFC detector without extra reference circuit AC coupled limiter amplifier for sound intercarrier signal Alignment free FM PLL demodulator with high linearity Sound IF SIF input for single reference Quasi Split Sound QSS
43. l components in this chassis have special safety related characteristics Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols or UL FCC FDA or VDE marking on the circuit diagram and parts list When replacing any of these components substitute the one which has the same safety characteristics as specified in the manual Description of the special markings A The components identified by the A marking have special safety related characteristics AE The components identified by the AE marking are listed by EMC and have special safety related characteristics CB The components identified by the CB marking have been evaluated to the CB standard The components identified by the E marking are listed by EMC The components identified by the G marking have critical characteristics The components identified by the Z marking have important characteristics 60 CIRCUIT DIAGRAM FOR 21E88
44. minal of the main PCB Power on the TV and set the brightness and sub brightness to minimum Ensure that the voltage from the main PCB reads as follows 2 3 Regulate voltage adjustment components on the power section until the B the voltage reaches the rated value Table 1 Test Point Voltage V Negative of VD851 118V 2V Negative of VD852 17V 1V Negative of VD854 11V 1V Negative of VD857 14V sy Positive of C874 9V 0 5V Positive of C878 5V 0 5V Positive of C800 5V 0 25V Note Its impossible to check the power part separately from the main chassis board as the part is mounted on the main chassis board The power components etc should be checked for burnout when power on If burned out do not power on the TV again until the cause is found out SERVICE MANUAL 3 High Voltage Inspection Measure voltages of test points on the main PCB with the digital voltmeter Measure the CRT high voltage with the high voltage testing equipment and heater voltage with the high frequency effective voltmeter The rated values are shown as below Table 2 Test Point Voltage V 25 1 5V BSC60U FBT onl Negative of VD603 nr ony 27 1 5V for BSC62V1 FBT only Negative of VD855A 195 5 0V 25 1 5KV for IRICO SHANGHAI NOVEL LG CHUNGHWAT CRT anode and THAI CRTs 27 1 5KV SAMSUANG BMCC Heater 6 3 0 3Vrms 4 Focus Adjustment Caution Dangerously high voltages
45. mode PLL controlled SIF AGC detector for gain controlled SIF amplifier single reference QSS mixer for high performance Electrostatic Discharge ESD protection for all pins 48 SERVICE MANUAL 3 Block Diagram ueJBeiq zz B 3 yams aynw ir 9 2VHW SSO 18086 Puer oe 3194156 SNIddl 12 Yas vv ANNOS A set 3SION 99v 9 JA HaNn L X0193130 ASVLIOA 4 4 72 O9VA 49 SERVICE MANUAL 6 MSP34X0G MULTISTANDARD SOUND PROCESSOR FAMILY Release Note Revision bars indicate significant changes to the previous edition The hardware and software description in this document is valid for the MSP34X0G version B5 and following versions 1 Introduction The MSP34X0G family of single chip Multistandard Sound Processors covers the sound processing of all analog TV Standards worldwide as well as the NICAM digital sound standards The full TV sound processing starting with analog sound IF signal in down to processed analog AF out is performed on a single chip Figure 10 shows a simplified functional block diagram of the MSP34X0G This new generation of sound processing ICs now includes versions for processing the multichannel television sound MTS signal conforming to th
46. mponents identified by have special safety related characteristics Use replacement components which have the same characteristics as the original parts Specification are subject to change without notice 2 Cold ground L Hot ground FinalAssembly Diagram for 21E88 or White nitro magnetic paint Q04 3 Soldering agent Tin solder ZL Plasticine Protection film 2124 width 250mm Binding wire XJ 100 Notched nut MK Onlyfor Seg Hitachi GS CRTs N Z Japan Standard Tappingscrew4 20BABh Japan Standard Tapping screw4 16BTEBh Japan Standard Tappingscrew3 12VwACh 5 5 Notched nut M5 Notfor Seg Hitachi CRT Washer 1 Model No label M FJ or Z Wire clip A Black 7 sL y E Wire clip A j 7 I Wire clip Ly p S Distance clip 3 2 AV plate Rear terminals p Back cover Main PCB assembly CRT RGB PCB assembly After adjustment of the two FCBs Front cover assembly lock them with white nitro magnetic paint Q04 3 on the shafts CRT assembly Code No Parts Qty Remarks From Wire Connector XS10B of Front Cover Assembly FINAL WIRING DIAGRAM FOR 21E88 Side AVBoard Assembly XPKOB XPK04B Wired Connector XPK03 From Wire Connector XS10A of Front Cover Assembl Main Board
47. n continued 19 SERVICE MANUAL MONO gt NICAM level No use in simple version AFC gain data setting in TV mode 1 Adjust HAFC gain in the lowest two bits of HAF C Bit 2 0 With weak signal received AFC gain 0x10 with strong signal received AFC gain 0x00 Bit 7 Criterion of signal strength gt NOIS Weak signal Bit 0 lt NOIS Strong signal Audio 00 85DBorless 7F 0DB 7 BITS No use No use NICAM chip five equalizer data when the sound mode set to MUSIC No use in simple version B11 for 120Hz B12 for 500 Hz B13 for 1 5KHz B14 for 5KHz B15 for 10KHz NICAM chip five equalizer data when the sound mode set to NEWS No use in simple version B21 for 120Hz B22 for 500 Hz B23 for1 5KHz B24 for 5KHz B25 for 10KHz NICAM chip five equalizer data when the sound mode set to THEATRE No use in simple version B31 for 120Hz B32 for 500 Hz B33 for 1 5KHz B34 for SKHz B35 for 10KHz Highest four bits BBE Low contour OdB to 15dB Lowest four bits BBE process 0dB to 15dB OSD frequency set Bit 1 Chinese 1 Yes 0 No Bit 0 English 1 Yes 0 No 00 hex MDB OFF default No use in simple version MDB effect strength hex maximum MDB No use in simple version 00 hex no harmonics are added default MDB harmonic content 64 hex 5096 fundamentals 5096 harmonics hex 10096 harmonics continued
48. n Input terminal for External Audio signal For 8801 EXT in Input terminal for feedback signal For TMPA8807 33 H correc SIF in Input terminal for H correction and 2 SIF 34 DC NF Terminal to be connected capacitor for DC Negative Feedback from SIF Det output 35 PIF PLL Terminal to be connected with loop filter for PIF PLL This terminal voltage is controlled PIF VCO frequency continued 39 SERVICE MANUAL 36 IF VCC 5 V VCC terminal for IF circuit Supply 5 V 37 S Reg F Terminal to be connected capacitor for stabilizing internal bias 38 Deemph Terminal to be connected capacitor for SIF Det Audio out De Emphasis 39 IF AGC Terminal to be connected with IF AGC filter 40 IF GND GND terminal for IF circuit 41 IF IN Input terminals for IF signals 42 Pin 41 and Pin 42 are both input poles of differential amplifier 43 RF AGC Output terminal for RF AGC control level 44 VCC 5V VCC terminal for Y C circuit Supply 5 V 45 Monitor out Output terminal for CVBS or Y signal selected by BUS video SW 46 Black Det Terminal to be connected with Black Det filter for black stretch 47 APC Fil Terminal to be connected with Chrome PLL filter APC filter for Chroma demodulation This terminal voltage controls frequency of VCXO 48 IKin Input terminal to sense AKB cathode current 49 RGB VCC VCC terminal for RGB circuit 9 v Supply 9 V 50 ROUT Ou
49. o IF demodulator 7 NN02 MSP3410G NICAM audio processor 8 U101 TDQ 5B6M Tuner 30 SERVICE MANUAL SERVICE DATA TECHNICAL DATA OF KEY ICS 1 TOSHIBA 2IN1 IC SERIES 1 General Description Toshiba 2IN1 IC series are super ICs combined small signal processing with 8 bit micro control unit including TMPA8801 8802 8803 8807 8808 8809 8812 8813 8821 8823 8827 8829 with the following features Table 6 Type E W Type Color System ROM Package for ICs with OTP ROM Correction TMPA8801CSBNG TMPA8801PSBNG PAN NTSC SECAM 64K 48K 32K SDIP64 CPBNG CMBNG TMPA8802CSBNG TMPA8801PSBNG NTSC 64K 48K 32K SDIP64 CPBNG CMBNG TMPA8803CSBNG TMPA8801PSBNG PAN NTSC 64K 48K 32K SDIP64 CPBNG CMBNG TMPA8801CSCNG TMPA8801PSCNG PAN NTSC SECAM 64K 48K 32K SDIP64 CPCNG CMCNG TMPA8807CSBNG TMPA8807PSBNG PAN NTSC SECAM 64K 48K 32K Yes SDIP64 CPBNG CMBNG TMPA8808CSBNG TMPA8807PSBNG NTSC 64K 48K 32K Yes SDIP64 CPBNG CMBNG TMPA8809CSBNG TMPA8807PSBNG PAN NTSC 64K 48K 32K Yes SDIP64 CPBNG CMBNG TMPA8813CSNG TMPA8813PSNG PAN NTSC 64K 48K 32K SDIP64 CPNG CMNG TMPA8821CSNG TMPA8821PSNG PAN NTSC SECAM 64K 48K 32K SDIP64 CPNG CMNG TMPA8823CSNG TMPA8821PSNG PAN NTSC 64K 48K 32K SDIP64 CPNG CMNG TMPA8827CSNG TMPA8827PSNG PAN NTSC SECAM 64K 48K 32K Yes SDIP64 CPNG CMNG TMPA8829CSNG TMPA8827PSNG PAN NTSC 64K 48K 32K Yes SDIP64 CPNG CMNG TMPA8812CSDNG TMPA8812
50. onverter 3 ch for a touch key input with key ON wake up CIRCUIT Remote control signal preprocessor Two 16 bit internal timer counter 2 ch Two 8 bit internal timer counter 2 ch Time base timer watchdog timer 16 interrupt sources external 5 internal 11 _ bus interface multi master STOP and IDLE power saving modes TV Processor IF Integrated PIF VCO aligned automatically Negative demodulation PIF Multi frequency SIF demodulator without external Tank coil Video Integrated chroma traps Black stretch Y gamma Chroma Integrated chroma BPFs PAL NTSC SECAM demodulation s at 8 MHz CCD Decoder Digital data slicer for NTSC OSD Clock generation for OSD display Font ROM characters 384 characters Characters display 32 columns 12 lines Composition 16 18 dots Size of character line by line Color of character 8 character by character Display position H 256 V 512 steps BOX function Fringing smoothing Italic underline function Conform to CCD REGULATION Jitter elimination RGB Base Band Integrated 1 H base band delay line Base band TINT control Internal OSD interface Half tone and transparent for OSD External YCbCr interface for DVD RGB cut off drive controls by bus ABCL ABL and ACL combined Sync Integrated fH 640 VCO DC coupled vert ramp output single EW correction with EHT input For
51. oudspeaker terminal Vcc 2 supply voltage OUT 3 positive loudspeaker terminal IN 4 positive input IN 5 negative input SVR 6 half supply voltage decoupling ripple rejection MODE 7 mode selection input standby mute operating GND 8 ground 9 not connected TDA8943SF Mono Bridge Tied Load BTL audio amplifier Max output power 6W 43 SERVICE MANUAL 3 TDA8944J 2 7 W STEREO BRIDGE TIED LOAD BTL AUDIO AMPLIFIER 1 General description The TDA8944J is a dual channel audio power amplifier with an output power of 2 W atan 8 load and a 12 V supply The circuit contains two Bridge Tied Load BTL amplifiers with an all NPN output stage and standby mute logic The TDA8944J comes in a 17 pin DIL bent SIL DBS power package The TDA8944J is printed circuit board PCB compatible with all other types in the TDA894x family One PCB footprint accommodates both the mono and the stereo products 2 Features Few external components Fixed gain Standby and mute mode No on off switching plops Low standby current High supply voltage ripple rejection Outputs short circuit protected to ground supply and across the load Thermally protected Printed circuit board compatible 3 Block diagram SHORT CIRCUIT AND TEMPERATURE PROTECTION MBK933 GND1 GND2 Fig 18 Block diagram 44 4 Pinning information 4 1 Pinning 4 2 Pin description SERVICE M
52. overcurrent detection signal and constant voltage signals 54 SERVICE DATA OF KEY ICS SERVICE MANUAL Table 14 Functions and Service Data of AT24C08 16 Pins 55 Digital Multimeter Pin No Function Description Reference Voltage Positive Resistance Negative Resistance V 20 20 1 Address input 0 0 001 0 00 2 Address input 0 0 001 0 00 3 Address input 0 0 001 0 00 4 Common ground 0 0 001 0 00 5 Clock line 5 7 4 83 6 Data line 4 99 6 9 5 15 7 PW write protect 4 99 9 5 5 31 8 Supply voltage 5 3 5 3 25 Table 15 Functions and Service Data of MSP3410G Pins Digital Multimeter Pin No Function Description Reference Voltage Positive Resistance Negative Resistance V 20 20 1 0 16 7 3 5 3 2 AVD GL OUT NC 2 52 6 8 5 51 3 D CTR I O 1 NC 0 01 7 3 5 57 4 D CTR I O 0 NC 0 01 7 2 5 58 5 ADR SEL 4 79 0 7 4 54 6 STANDBYQ 4 79 0 7 4 54 7 I2C CL 3 56 7 4 44 8 I2C DA 3 9 7 4 44 9 I2S CL NC 2 36 7 2 6 24 10 125 5 24 7 2 6 24 11 I2C DA WT NC 2 36 7 2 6 24 12 I2S DA IN1 NC 0 07 7 2 5 29 13 ADR DA NC 0 07 7 2 5 59 14 ADR WS 0 07 7 2 5 59 15 ADR CL 0 07 7 2 5 59 Continued SERVICE MANUAL 16 DVSVP 4 79 0 7 4 54 17 DVSS 0 01 0 001 0 00 18 I2S DA
53. r random word addressing AT24C16 16K SERIAL EEPROM Internally organized with 128 pages of 16 bytes each the 16K requires an 11 bit data word address for random word addressing 6 Block Diagram SERIAL gt CONTROL H V PUMP TIMING LOGIC I LOAD DEVICE COMP ING ADDRESS COMPARATOR LOAD 1 DATA RECOVERY RW EEPROM DATA WORD ADDR COUNTER SERIAL MUX DourfACK Logic SERVICE MANUAL 8 SWITCH MODE POWER SUPPLY IC STRG5653 G8656 1 General Description The STRG5653 G8656 are part of the STRG5600 G8600 series thick film ICs for switch mode power supply incorporating power MOSFET with a high precise error amplifier The ICs feature fewer external components small size and standard power supply The series STR G8600 use Chip on Chip technology with the same operation principle as STR G5600 Pin configuration function and threshold of STR G8600 are compatible with those of STR G5600 2 Block Diagram 3 Function of Terminal Fig 27 Table 14 Function of Terminal Terminal Symbols Description Functions No 1 D Drain Terminal MOS FET drain 2 s Source Terminal MOS FET source 3 GND Ground Terminal Ground 4 VIN Power supply Terminal Input of power supply for control signals 5 O C P F B Overcurrent Feedback Terminal Input of
54. screw holding the deflection yoke assembly and slide it forward or backward to display a vertical green zone on the screen Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green zone is located vertically at the center of the screen 1 9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is obtained 1 10 Tighten the clamp screw of the assembly temporarily Check purity of the red raster and blue raster until purities of the three rasters meet the requirement SERVICE MANUAL DEFLECTION COIL PURITY CONVERGENCE MAGNET MODULE GLASS CLOTH TAPES Fig 1 2 Convergence Adjustment Preparation ADHESIVE DEFLECTION Yok Before attempting any convergence adjustment the TV should be operated for at least 15 minutes 2 1 Center convergence adjustment 2 1 1 Receive dot pattern 2 1 2 Adjust the brightness contrast controls to obtain a sharp picture 2 1 3 Adjust two tabs of the 4 pole magnet to change the angle between them and red and blue vertical lines are superimposed each other on the center of the screen 2 1 4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal on the center of the screen 2 1 5 Adjust two tabs of the 6 pole magnet to superimpose red blue line and green line 2 1 6 Remember red and blue movement Repeat steps 2 1 3 obtained 2 2 Circumference convergence adjustment
55. t off GDRV G drive BDRV B drive CNTX Contrast Max BRTC Bright center COLC Color center for NTSC TNTC Tint center for NTSC TNTCAV Tint center in VIDEO mode for NTSC COLP Color center for PAL COLS Color center for SECAM DCOL DVD color SCOL Sub color center for DVD SCNT Y sub contrast CNTC Contrast center CNTN Contrast Min BRTX Bright Max BRTN Bright Min COLX Color Max 13 continued SERVICE MANUAL Color Min Tint Max Tint Min Sharp center for NTSC 3 58 TV Sharp center for NTSC 3 58 VIDEO Sharp center for other color system TV Sharp center for other color system VIDEO Sub sharp center in DVD ASSH Asymmetry sharpness SHPX Sharpness Max SHPN Sharpness Min TXCX Text RGB in user contrast Max RGCN 2 214 o gt Text RGB in user contrast Min ABL DCBS Bit 5 Y peak limiter 0 Off 1 On Bit 4 OSD ABL 0 Active 1 Inactive 00 ABL start point OV 01 0 15V Bit 3 2 ABL start point 10 0 30V 11 0 45V 00 0 2V 01 0 4V Bit 1 0 ABL gain 10 0 6 11 0 8V Bit 7 Blank SW 0 H V blanking on 1 H V blanking off Bit 3 2 00 OSD level 80 IRE 01 7OIRE OSD level 10 60IRE 11 50IRE 00 Off 01 Y point 90 IRE Gain Y gamma 10 80IR
56. tal of two 8K devices may be addressed on a single bus system The AO and pins are no connects The AT24C16 does not use the device address pins which limits the number of devices on a single bus to one The AO and A2 pins are no connects WRITE PROTECT WP The AT24C01A 02 04 16 has a Write Protect pin that provides hardware data 22 SERVICE MANUAL protection The Write Protect pin allows normal read write operations when connected to ground GND When the Write Protect pin is connected to Vcc the write protection feature is enabled and operates as shown in table 13 Table 13 WP Pin Part of the Array Protected Status 24 01 24 02 24 04 24 08 24C16 At Vcc Full 1K Full 2K Full 4K Normal Upper Array Array Array Read Half Write 8K Operation Array At GND Normal Read Write Operations 5 Memory Organization AT24C01A 1K SERIAL EEPROM Internally organized with 16 pages of 8 bytes each the 1K requires a 7 bit data word address for random word addressing AT24C02 2K SERIAL EEPROM Internally organized with 32 pages of 8 bytes each the 2K requires an 8 bit data word address for random word addressing AT24C04 4K SERIAL EEPROM Internally organized with 32 pages of 16 bytes each the 4K requires a 9 bit data word address for random word addressing AT24C08 8K SERIAL EEPROM Internally organized with 64 pages of 16 bytes each the 8K requires a 10 bit data word address fo
57. tput terminal for R signal 51 GOUT Output terminal for G signal 52 BOUT Output terminal for B signal 53 TV AGND GND terminal for Analog block 40 SERVICE MANUAL 7 Microcontrollers Descriptions MROM version TMPA8801 8807CMBNG CPBNG CRBNG ICSBNG TV signal processor interface CLK P32 P33 P64 to P67 P70 71 P57 P54 P34 35 A Display Character Jitter Memory ROM Elimination Power Supply Y up AVpp Ring up MPAGND Oscillator On screen display circuit 1 GOS o 68 up DVpp TLCS 870 X Data Memory up DVss CPU core RAM Data Slicer ROM corrective circuit up VVss rA Program Counter Reset Test Pin RESET v Interrupt Controller TEST System Controller x Kk Standby Controller Resonator Time Base 16 bit 8 bit Program Memory Connecting Pins Timing Generator Timer Timer Timer Counter ROM XIN High Clock 2 TC3 Rar frequency Generator Watchdog K Timer Inst Register Inst Decoder DA Converter Key on Video signal Remote Serial Bus PWM wake up output control signal Interface H Z SZ P20 P40 P50 to P53 56 P60 to P61 63
58. tructure 2INI IC TMPA8801PSBNG N201 Line Drive V404 AV OUT AV IN Block Diagram for CN 18EA Chassis Power Circuit 220V 50Hz STR G5653 N801 CRT Video Amplifier V901 V903 Vertical Out LA78040 N602 Horizontal T401 Output T V405 28 SERVICE MANUAL 2 BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM 220 50Hz Interference proof Circuit L802 C801 C802 Degauss ing Circuit RT801 XT801 Bridge Rectifier VD801 VD804 C803 C806 Filter L803 C807 Switch Regulator N801 T801etc IF Pre VIRIL Output Contr ol V101 V501 V503 2in11lC NICAM N201 NN01 NN02 Sampling Amplifier VD820 9 2 11v Regulator 5V 2 i Second 5 ound V883 VD887 C874 Regulator Trap N802 C878 V901 V903 V204 V207 Vertical Output N601 NICAM NNO1 NN02 2in 11C N201 Sound Powe r Amplifier N301 EEPROM D702 Band Contr ol V230 V231 Line Drive V431 29 Regulator V881 VD883 c80 LED RMT Circuit N701 D701 Regulator N121 R128 C125 C126 HV FV SV 111 T402 Vertical Output N601 Horizontal Output V432 Fig 11 Diagram for CN 18EA Supply Voltage System SERVICE MANUAL 3 CHASSIS DESCRIPTION General Description CN 18EA chassis is applied in 21E88 series By use of Toshiba V C D MCU 2IN1 IC for TV small signal processing and bus control the chassis enables TV tuning adjustment control and pi
59. und when the TV is in operation Install a suitable isolating transformer of beyond rated overall power when servicing or connecting any test equipment for the sake of safety SERVICE MANUAL When replacing ICs use specific tools or a static proof electric iron with small power below 35W Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to avoid electronic gun magnetized and decrement in convergence of the CRT When remounting the TV chassis ensure that all guard devices such as nonmetal control buttons switch insulating sleeve shielding cover isolating resistors and capacitors are installed on the original place Replace blown fuses within the TV with the fuse specified in the parts list When replacing wires or components to terminals or tags wind the leads around the terminal before soldering When replacing safety components identified by the international hazard symbols on the circuit diagram and parts list it must be the company approved type and must be mounted as the original Keep wires away from high temperature components PRODUCT SAFETY NOTICE CAUTION FOR YOUR PROTECTION THE FOLLOWING PRODUCT SAFETY NOTICE SHOULD BE READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET 1 Many electrical and mechanical components in this chassis have special safety related characteristics These characteristics are often passed unnoticed by a visual inspection and the X ray radiation
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