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XOCECO TQ2426 Service Manual

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COLOR TELEVISION
TQ2426

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Summary of Contents for XOCECO TQ2426

  • Page 1 COLOR TELEVISION TQ2426...

  • Page 2: Table Of Contents

    CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………..…….… Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..……………………….………….……… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………..……………... Troubleshooting………………………………………………………………………..…… Schematic diagram …………………………………………………………………….….. APPENDIX-A: Main assembly list APPENDIX-B: Exploded view...

  • Page 3: Safety Precautions

    Note: This service manual is only for professional service personnel’s reference. Before servicing the unit, please read the following items carefully. Safety instruction 1. X-RAY radiation precaution 1.1 Excessive voltage will cause harmful X-ray. To avoid this radiation hazard, the high voltage should fall within the limitation.

  • Page 4: Alignment Instructions

    degaussing circuit work. 4. If the CRT with magnetism affects color purity and convergence, when the auto degaussing eraser. if the color purity and convergence are still not very good, then corresponding adjustment should be done. Refer to picture tube adjustment method for adjustment. Alignment instruction 1.
  • Page 5 PROM copy VIF adjustment High voltage check S-TRAP adjustment H VCO adjustment X-ray protect check OSD adjustment Filament voltage check B+ adjustment Picture and sound check RF AGC adjustment Sub brightness check Focus adjustment White balance check Screen-grid voltage white balance adjustment Color Purity, convergence check Scan amplitude, center and...
  • Page 6 3. Factory menu adjustment (FACTORY MENU PAGE) 3.1 VIF adjustment Receive a NTSC signal at will, enter factory menu VCJ ADJ, select VIF VCO, press “VOL+/_”, then display “END” and it means IC has adjust IF to 45.75MHz automatically. 3.2 S-TRAP adjustment Receive a NTSC signal at will, enter factory menu VCJ ADJ, select S-TRAP, press “...
  • Page 7 a) field amplitude adjustment Receive PERCENT OVERSCAN signal of VP403, set user control to “standard” of AV channel, enter RASTER ADJ item, adjust field amplitude V-SIZE, let the vertical reproduction ratio of picture acceptable b) line amplitude adjustment receive PERCENT OVERSCAM single of VP403, set user control to “standard” of AV channel. 13”...
  • Page 8 example: BESTBUY require brightness of window 100IRE≥70 ft.L), if not, enter PICTURE ADJ item. AV channel: ATV CONTRAST COMPONENT channel: YUV CONTRAST DTV channel: DTV CONTRAST Fine adjust the items to let it be satisfied. 4.6 Color purity and convergence check (in normal way) 4.7 AV/S terminals video and sound IN/OUT check 4.8 COMPONENT channel video and sound IN check.
  • Page 9 11. H-POS Line position adjustment 12. H-SIZE Field amplitude adjustment 13. PARA Pincushion adjustment 14. CONTER Angle adjustment 15. Trape Trapezia adjustment 16. CUT R TV-NTSC, AV white balance adjustment 17. CUT G 18. CUT B 19. DRV-R 20. DRV-B 21.

  • Page 10: Working Principle Analysis Of The Unit

    Working principle: The unit adopts the super single IC R2J10165(N102) with I2C bus controlled processor produced by RENEsAS, which includes IF, color decoder, 8-bits MCU, pre-video amplify, H/V deflection, AV switch, audio processing, ect.. The main interfaces are: one AV IN, one S-VIDEO IN, YCbCr, one AV OUTPUT. The signal flow is below: The antenna reception signal RF will be sent to the integrative tuner (contains HF and IF amplifier circuits), which is controlled by SDA and SCL, selects appropriate channel and sends the selected IF...

  • Page 11: Block Diagram

    Block diagram...

  • Page 12: Ic Block Diagram

    IC Block diagram: 1.R2J1016XFP...
  • Page 13 2.STR-W6553A Pin function: STR-W6500 STR-X6500 Name Function [T0220F-6L] [T03PF-7L] Drain terminal Drain of MOSFET Source/Ground terminal MOSFET Source and Ground S/GND Power terminal Control power input SS/ADJ Soft-Start/over current Over current protect and Soft-Start protect timer adjust Feed Back terminal Timing voltage control signal input Gap oscillation control Bottom check terminal...
  • Page 14 3. AN7522N The AN7522 is a monolithic integrated circuits designed for 3.0WX2 channel BTS(8V, 8Ω)output audio power amplifier. 4.TDA8177 Designed for monitors and high performance TVs, the TDA8177 vertical deflection booster delivers flyback voltages up to 70V. The TDA8177 operates with supplies up to 35V and provides up to 3App output current to drive the yoke. The TDA8177 is offered in HEPTAWATT package...
  • Page 15 5.R8A6695SFP...

  • Page 18: Troubleshooting

    Troubleshooting guide 1. no raster, no sound If the power indicator light? There is short circuit primary The light is red, press Press POWER to Check secondary coil POWER can’t turn on turn on and the FU501 power the TV light is blue melted? Check if N102 56#...
  • Page 19 3. with sound, without picture With sound but without picture No raster Have raster Check if B+ Check Check N102 is normal N102 RGB output periphery If H/V circuit V301C# Abnormal works output Check normally? H-frequency board, turner and its periphery Normal Check each...

  • Page 23: Appendix-A: Main Assembly List

    APPENDIX-A: Main assembly list NAME MAIN COMPONENT AND it’S NO. Main board 667.TQD26-01H N102 R2J10165 (353.10165-10) N301 STV8172 (352.81720-20) NV01 AN7522N (352.75220-00) N501 STRW6556 (352.65560-10) TUNER101 ENV56M23D8F (590.40C09-00) T301 FBT/BSC26-N1013A (472.24216-00U) DTV digital processing 667.TQ2092H-69 NH07 R8A66953 (353.66953-10) board Side AV board 667.TQ2426H-29 Keypad board 667.TQ2426H-05...
  • Page 24 603-TQ24260-10 Ver.1.0...

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