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XOCECO LC20H3D Service Manual

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COLOR TELEVISION
LC20H3D

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Summary of Contents for XOCECO LC20H3D

  • Page 1 COLOR TELEVISION LC20H3D...

  • Page 2: Table Of Contents

    CONTENT Safety instructions………………………………………………………………………..… Instructions on adjusting and testing…………………………….…….………………… Trouble shooting……………………………………………………….…………………… Method of software upgrading………………………………………….………………… Brief introduction and working principle of L20H3………………………………..…………. Wiring diagram……………………………………………………………..……………..Serial NO. of parts……………………………………………………………………….… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Troubleshooting guide………………………………………………………………..……...

  • Page 3: Safety Instructions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety instructions 1.Instructions Be sure to switch off the power supply before replacing or welding any components or inserting / plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a)Do not touch here and there by hand at will;...

  • Page 4: Instructions On Adjusting And Testing

    breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling. 2.12. For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual.
  • Page 5 Adjust TV board Check main board Check TV board Combined test for general assembly Connect to central signal source satellite signal, check if various TV functions (station skipping, modulate quantity control etc), check if the output of earphone and speaker are normal Input AV/S terminal signal, check different functions of AV/S terminals Input VGA signal and check if display is normal in...
  • Page 6 5. Adjustment for the TV board Connect the main board and infrared receiving board (as per wiring diagram 203-L15H30-01JL) and press the POWER key on the remote control set. Now the indication lamp of the infrared receiving board is blue or yellow. Measure N301 PIN2 of TV board to be 3.3 V, one terminal of inductor L630 to be 5 V and one terminal of inductor L632 to be 12 V 6.Adjustment of white balance (using the white balancer CA210 and K7253 signal generator specialized for LCD)
  • Page 7 Check if fine tuning is normal. Check if the output of earphone or loudspeaker is normal and if the picture is normal. b).Interface of AV/S Terminals Connect to access the signal of AV/S terminals separately and check if the picture or sound is normal.

  • Page 8: Trouble Shooting

    separately and check if the picture and sound is normal. 8.Preset ex-works In the status of TV enter the factory menu by pushing the factory key and then perform presetting. 9.Ex-works packing Check accessories and then pack them in box. Trouble shooting Before servicing please check to find the possible causes of the troubles according to the table below.
  • Page 9 2.TV set: Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly into the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been switched on.

  • Page 10: Method Of Software Upgrading

    Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal. No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose.

  • Page 11: Brief Introduction And Working Principle Of L20H3

    Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please refer to the Fig. Above (already defaulted by the system, normally no need to change). 4.Switch on TV set the FLASH write program begins to run; 5.After FLASH write is over, push button “cancel”...
  • Page 12 BLOCK DIAGRAM...
  • Page 13 IC BLOCK BA7657F / BA7657S Red 1 input HD 1 input HD Sync signal detector HD 2 input Green 1 input HD output Ground Red output Blue 1 input Ground Green output Red 2 input Composite video input (Sync on Green) Syncsepa Ground Composite sync output...
  • Page 16 PW130...
  • Page 20 TDA4470 Block Diagram Ï Ï L’ switch Loop Offset Ï Ï filter comp. (optional) Ï Ï Ï Ï Ï Ï Ï Control FPLL phase shift Ï Ï Ï switch Ï Ï Ï Ï Ï VIF amp Ï Video Ï Ï Ï...

  • Page 21: Wiring Diagram

    back IR BOARD KEY BOARD back TO LCD PANEL TO LCD PANEL 30ps X701 CNB1 CNB2 DIGITAL BOARD ANALOG BOARD X204 HIGH VOLTAGE VCT3803 X601 TUNER1 PW1306 X614 X603 5ps X602 back or front X102 X501 X603 MSP3420 X605 X602 X203 HIGH VOLTAGE...

  • Page 22: Serial No. Of Parts

    Serial No. of Parts 15" 17" 20" Sell area America America Europe America LCD panel Samsung Samsung Chimei 335-15012-00 335-17050-00 335-2000F-00 Back light board 667-L15H3-14 667-L17H3-14 667-L20H3-14A High frequency board 667-L15H3S-55 667-L15H3-55 667-L20H3-55 Main board 667-L15H3-01 667-L17H3-01 667-L20H3-01 adapter 302-L1510-02 302-AD16A-02 302-AD16A-02 antetype...

  • Page 23: Troubleshooting Guide

    Troubleshooting guide No raster Does the logo appear on the screen Check whether the adapter Check whether X101 is when turning on the set ? supply 12V power to Digital Board. properly inserted. Good Check whether there is R.G.B Check U125965V. Check whether FUSE is melted.
  • Page 24 TV board troubleshooting No picture but have raster. Measure the waveform of R.G.B Hors, Vers at X7. Check whether N1 has Check whether X9 pin 1, pin 2 have 5V power supply. 5V power input. Measure N1 pin 33, pin 35 Replace N2 Replace N1 waveform.

  • Page 25: Exploded View

    EXPLODED VIEW...
  • Page 26 PART LIST OF EXPLODED VIEW DESCRIPTION PART# LABEL 881-63076-27 Transfer axis cover 808-10610-AF0 Screw 851-23010-14 Back cover 780-P03LH-121 Button baffle 808-60865-02 Button 667-L20H3-05 Screw 851-13010-11 Screw 851-34008-51 Speaker 384-40906-00 Remote receiver board 667-L20H3-09 LED column 706-60188-100 LOGO No number Front cover 780-P03L0J0G3 LCD panel 335-2000F-00...

  • Page 27: Part List

    PART LIST PART# DESCRIPTION LOCA.NO. 100-L20H30-51 LC-20H3D 100-L20H30-01 L20H3 335-2000H-00 * DISPLAY SCREEN LC201V02-A3KB 364-41207-00 ANTENNA SOCKET HR-F 384-40906-U0 SPEAKER ST512-05 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 485-10157-00 POWER CORD LAP-31+730 BLACK 2m ! 488-10012-00 BATTERY 7#( made in china 604-L20H37-04 OWNER'S MANUAL(Digistar,0520) 655-4E301-88...
  • Page 28 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13005-81 SCREW P(+) M3X5-D.Zn 852-13012-81 SCREW P(+)M3X12-D.Zn 852-13012-81 SCREW P(+)M3X12-D.Zn 852-43008-85 SCREW F(+)M3X8- BLACK 852-43008-85 SCREW F(+)M3X8- BLACK 852-94010-85 COMPOSE SCREW SJ2836 M4X10-R 852-94010-85 COMPOSE SCREW SJ2836 M4X10-R 859-1A1288-00A...
  • Page 29 364-39101-00 9-PINS CONNECTORS TJC3-09A X603 364-391BD-00 9-PINS CONNECTORS 53047-0910 X601 364-91206-00 S-VIDEO TERMINAL S-402 X606 364-92216-00 AV JACK AV205-1 X608 364-93202-00 AV JACK AV306-2 X604 364-93202-00 AV JACK AV306-2 X607 464-6C647-M0 ELECTROLYTIC CAPACITOR CD110-10V-47uF-M C321 464-6D810-M1 ELECTROLYTIC CAPACITOR CD110-16V-1000uF-M C304 464-6D810-M1 ELECTROLYTIC CAPACITOR CD110-16V-1000uF-M C353...
  • Page 30 342-08470-90 SMD TRANSISTOR BC847AW V605 342-08570-90 SMD TRANSISTOR BC857 AW V301 342-08570-90 SMD TRANSISTOR BC857 AW V302 342-08570-90 SMD TRANSISTOR BC857 AW V303 342-08570-90 SMD TRANSISTOR BC857 AW V601 353-11170-20 SMD IC AS1117M-3.3 N301 353-34200-10 SMD ICMSP3420G-B8-V3 N401 353-62494-20 *SMD ICM62494FP N403 353-70270-10 SMD ICKIA7027F...
  • Page 31 455-12247-H0 SMD RESISTOR FTR0603472JR R631 455-12247-H0 SMD RESISTOR FTR0603472JR R632 455-12247-H0 SMD RESISTOR FTR0603472JR R634 455-12247-H0 SMD RESISTOR FTR0603472JR R638 455-12247-H0 SMD RESISTOR FTR0603472JR R639 455-12268-H0 SMD RESISTOR FTR0603682JR R649 455-12310-H0 SMD RESISTOR FTR0603103JR R324 455-12310-H0 SMD RESISTOR FTR0603103JR R330 455-12310-H0 SMD RESISTOR FTR0603103JR R414...
  • Page 32 455-22075-H0 SMD RESISTOR RC11-1/8W-75-J R626 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R202 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R321 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R322 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R402 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R403 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R406 455-22110-H0 SMD RESISTOR RC11-1/8W-100-J R407 455-22113-H0 SMD RESISTOR RC11-1/8W-130-J R302...
  • Page 33 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C427 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C452 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C460 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C463 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C474 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C475 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C607 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C624 456-2410R-C1 SMD CAPACITOR C1608Y5V1E104ZT C625...
  • Page 34 456-3A33C-11 SMD CAPACITOR 0603CG3R3C500BA C318 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C410 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C411 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C413 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C414 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C417 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C418 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C419 456-A447R-C1 SMD CAPACITOR 06032E474Z100BA C420...
  • Page 35 667-L20H3-01L MAIN PCB ASS'Y 667-L20H3-01L\ MAIN PCB ASS'Y (MANUAL INSERTION ) 667-L20H3-01\ MAIN PCB ASS'Y (MANUAL INSERTION ) 329-61402-00 CRYSTAL HC-49/US 14.31818MHZ G301 364-11212-00 EARPHONE JACK ST-112 X207 364-23203-00 POWER SOCKET Q/LHD01-90 364-341BD-00 4-PINS CONNECTORS 53047-0410 X208 364-341BD-00 4-PINS CONNECTORS 53047-0410 X602 364-351BD-00 5-PINS CONNECTORS 53047-0510...
  • Page 36 342-08470-90 SMD TRANSISTOR BC847AW V902 342-08470-90 SMD TRANSISTOR BC847AW V903 342-08470-90 SMD TRANSISTOR BC847AW V904 342-08470-90 SMD TRANSISTOR BC847AW V905 353-00120-40 SMD IC ATTINY12L-4SC 353-01260-80 SMD IC74LV126D 353-02210-20 SMD ICSN74LS221D N902 353-03580-80 SMD IC LM358D 353-05410-90 *SMD IC 74LVC541AD 353-11170-D0 SMD IC LM1117 MPX-1.8 (M) 353-11170-D0 SMD IC LM1117 MPX-1.8 (M)
  • Page 37 454-03710-MC SMD ELECTROLYTIC CAPACITOR CDPS-10V-100uF-M C128 454-03710-MC SMD ELECTROLYTIC CAPACITOR CDPS-10V-100uF-M C624 454-03710-MC SMD ELECTROLYTIC CAPACITOR CDPS-10V-100uF-M C635 454-03710-MC SMD ELECTROLYTIC CAPACITOR CDPS-10V-100uF-M C643 454-03710-MC SMD ELECTROLYTIC CAPACITOR CDPS-10V-100uF-M C706 454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C901 454-04610-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-10uF-M C913 455-12000-H0 SMD RESISTOR FTR0603000XR...
  • Page 38 455-12222-H0 SMD RESISTOR FTR0603222JR R208 455-12222-H0 SMD RESISTOR FTR0603222JR R709 455-12222-H0 SMD RESISTOR FTR0603222JR R712 455-12230-H0 SMD RESISTOR FTR0603302JR R711 455-12233-H0 SMD RESISTOR FTR0603332JR R221 455-12233-H0 SMD RESISTOR FTR0603332JR R222 455-12233-H0 SMD RESISTOR FTR0603332JR R223 455-12233-H0 SMD RESISTOR FTR0603332JR R302 455-12233-H0 SMD RESISTOR FTR0603332JR R303...
  • Page 39 455-12330-H0 SMD RESISTOR FTR0603303JR R512 455-12347-H0 SMD RESISTOR FTR0603473JR R113 455-12347-H0 SMD RESISTOR FTR0603473JR R911 455-12410-H0 SMD RESISTOR FTR0603104JR R112 455-12410-H0 SMD RESISTOR FTR0603104JR R116 455-12410-H0 SMD RESISTOR FTR0603104JR R505 455-12410-H0 SMD RESISTOR FTR0603104JR R514 455-12410-H0 SMD RESISTOR FTR0603104JR R706 455-12410-H0 SMD RESISTOR FTR0603104JR R719...
  • Page 40 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C137 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C142 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C203 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C205 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C207 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C208 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C209 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C210 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C212...
  • Page 41 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C641 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C642 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C644 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C645 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C646 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C647 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C648 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C649 456-2410R-C2 SMD CAPACITOR C2012Y5V1E104ZT C704...
  • Page 42 666-13206-00 SMD FERRITE BEAD STPB3216-310PT L103 666-13206-00 SMD FERRITE BEAD STPB3216-310PT L106 666-13206-00 SMD FERRITE BEAD STPB3216-310PT L107 666-13206-00 SMD FERRITE BEAD STPB3216-310PT L108 666-13206-00 SMD FERRITE BEAD STPB3216-310PT L112 782-L20H3-010C MAIN PCB 667-L22A1K-14 INVERTER BOARD ASS'Y (INV20-606A) 302-AD16A-02 ADAPTER FSP060-1AD103 ENGLISH! 667-L20H3-05 KEY BOARD ASS'Y 360-10001-00...
  • Page 43 852-24010-84 SCREW SJ2829 M4X10-Y 868-20478-00A CUSHION 535-L20H3-03 WALL MOUNT ASS'Y 615-1A288-00A WALL MOUNT ASS'Y 852-34008-81 SCREW B(+) M4X8-D.Zn 855-B0016-00 EXPANDING BOLT M8X72 855-C4030-00 SCREW 4X30 605-L20H37-00 WALL MOUNT GUIDE (0520) 886-31511-00 WALL MOUNT PACKING BOX 887-21167-00 WALL MOUNT ACCESSORY PACKING BAG ( NEUTRAL ) SL20H30-51A10 SOFTWARE NA Digistar 301-UL20H3-31RG...

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