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LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LJ71A

MODEL : 20LS7D

20LS7D-JA

website:http://biz.LGservice.com

Содержание 20LS7D - - 20" LCD TV

Страница 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LJ71A MODEL 20LS7D 20LS7D JA website http biz LGservice com ...

Страница 2: ... 2 CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 7 TROUBLE SHOOTING 11 WIRING DIAGRAM 17 BLOCK DIAGRAM 18 EXPLODED VIEW 20 REPLACEMENT PARTS LIST 22 SVC SHEET ...

Страница 3: ...Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a ...

Страница 4: ...TV test method followed 2 Demanded other specification Safety JQA Specification EMC JQA Specification SPECIFICATION NOTE Specifications and others are subject to change without notice for improvement 4 General Specification TV No Item Specification Remark 1 Video input applicable system NTSC M ISDB S 2 RF Input Channel 1 VHF 1 12 2 UHF 13 62 3 CATV C13 C38 4 Terr digital 000 999 Logical CH Number ...

Страница 5: ...cal characteristic specifications 5 1 Display area 443 61 H 249 41 V mm 2 Outline dimension 472 0 H x 276 5 V x23 0 D mm Typ 3 Number of Pixels 1366 H x 768 V 1Pixel 3RGB Cells 4 Cell pitch 324 75μm H x 324 75μm V μm 1Pixel 3RGB Cells 5 Color arrangement RGB vertical stripe 6 Weight net 3 Kg Max 7 Operating Environment Temperature 0 50 deg Humidity 10 90 8 Storage Environment Temperature 20 60 deg...

Страница 6: ...deo Input NTSC 3 58 NTSC4 43 PAL PAL60 SECAM No Guarantee 6 D terminal Input Y Pb Pr D4 480i 480P 720P 1080i 576i 576p 720p 50Hz 1080i 50Hz No Guarantee 7 HDMI Input HDMI 8 Audio Input L R Input 3EA CVBS S video D terminal 9 Digital Optical Audio output AAC 5 1c Output Available for Digital TV only PCM 2ch Output 10 Modem 2400bps max 11 Conditional Acess System B CAS System 12 EPG 13 DATA Broadcas...

Страница 7: ...splayed check connecting computer jig and set again 4 Click Connect If Can t is displayed check connecting computer jig and set 5 Click Read tab and then load download file XXXX bin by clicking Read 6 Click Auto tab and set as below 7 click Run 8 After downloading check OK message 3 2 ADC Process 1 COMPONENT input ADC 1 Component Gain Offset Adjustment Convert to Component in Input source Signal e...

Страница 8: ...or not 5 AV2 Select input AV2 CVBS S video and whether picture is displayed or not 6 COMPONENT Select input COMPONENT and whether picture is displayed or not 7 HDMI Select input HDMI and whether picture is displayed or not 4 5 Power Consumption 1 Press EYE button on LG Adjust remocon and check whether LED color is amber or not 2 Press POWER button on LG Ajust remocon to enter Stand by mode 3 Check...

Страница 9: ...280 Area 0 value compulsorily 5 Adjustment Command 5 1 Adjustment Commands LENGTH 84 9 TOOL OPTION 17280 AREA OPTION 0 OPTION 1 6 OPTION 2 2 OPTION 3 2 OPTION 4 0 OPTION 5 9 FACTORY ON E0 00 00 Factory mode on FACTORY OFF E2 00 00 Factory mode off EEPROM ALL INIT E4 00 00 EEPROM All clear EEPROM Read E7 00 00 EEPROM Read EEPROM Write E8 00 data EEPROM Write by some values COLOR SAVE R G B cutoff D...

Страница 10: ... of E2 PROM 5 4 VRAM Read 1 Send CMD 70h to read Video RAM value from MICOM And save its value to 128 Bytes Buffer Common Buffer for the use of EDID 2 Delay 500ms Time to Wait and Read Video RAM from MICOM 3 Be transmitted the contents of MICOM s 128 bytes Buffer to PC 128th Data is the CheckSum of 127 bytes data That s OK if the value of adding 128 bytes Data is Zero 128 Bytes Delay 100ms Data 12...

Страница 11: ...ering or Change defect part of IC100 Q308 Change IC1000 IC1004 Pass Change IC1006 IC1005 Check Output of IC1006 IC1005 Fail Check short of Q308 TU600 IC500 Fail Re soldering or Change defect part of Q308 TU600 IC500 Pass Pass Change IC1002 IC1003 Change LED Assy Check Output of IC1002 IC1003 Pass Check LED Assy Pass Check P306 Connector Fail Check short of IC100 IC400 Fail Fail Re soldering or Cha...

Страница 12: ...Link Cable or Module Pass Fail Change Panel Link Cable or Module Check Inverter Connector or inverter Fail Change Inverter Connector or Inverter Pass Change IC100 Check Output of Q308 Pass Check the LVDS Output of IC100 Pass Check Input source Cable and Jack Fail Change Module Fail Fail Change Q308 ...

Страница 13: ... the input output of R918 Fail Check the P901 Pass Re soldering or change the defect part Check the X100 Check the input output of R127 Pass Check the input output of IC100 Pass Check and Change the Digital board Fail Fail Re soldering or Change the defect part ...

Страница 14: ...eck the input output of R806 Fail Check the J801 Pass Re soldering or change the defect part Check the X100 Check the input output of R121 Pass Check the input output of IC100 Pass Check input source cable and jack Fail Fail Re soldering or Change the defect part ...

Страница 15: ...e defect part Check the X100 Pass Check input source cable and jack Check input source cable and jack Repeat A B process Pass Check the output of TU600 Pass Pass Fail Check 5V of TU600 Re Soldering or change the defect part Check the input output of L702 R954 R948 Fail Change L702 R954 R948 Pass Check input output of IC100 Pass Fail Re soldering of Change defect part Check the X100 ...

Страница 16: ...the source input Check input Output of IC100 Fail Pass Re soldering of Change the defect part Check the X110 Check the input output of IC500 Fail Re soldering or Change the defect part Pass Check the Speaker Pass Check the Speaker wire Fail Change Speaker ...

Страница 17: ...T25026L 12 6631T20010F 13 EAD38509801 11 6631900013B 10 6631900048B 9 EAD38599001 8 6631T20033C 7 EAD38598901 6 T 5 EAD3 EAD3 3 85 5 9 9 9 880 0 1 01 4 6631 2 2 2 R 3 66319000 0 12C 2 EAD3 3 859910 1 Part No No 2 1 2 3 4 7 8 13 9 5 6 11 12 10 ...

Страница 18: ... 18 Connec t t o nex t page Connec t t o nex t page Connec t t o nex t page Connec t t o nex t page BLOCK DIAGRAM 1 Digital ...

Страница 19: ...MX25L4005A EXT_ISP TMDS Sig nal IIC D4 DIGITAL Bo ard Aud io SIDE AV Aud io EEPROM 2k D SUB Tuner TAFT H003F VIDEO SIF L R LVDS Sig nal L R Sc aler Vid eo Dec o rd er LGE9689AD LF L R Po wer Vo l Vo l Ch Ch So urc e Po wer Vo l Vo l Ch Ch So urc e LED G IR LED R G IR rec eiver Y Pb Pr DIGITAL Bo ard SIDE S VIDEO Y C D4 Aud io L R CVBS Aud io L R SIDE CVBS AV2 Y C RS232 2 Analog ...

Страница 20: ... 20 300 200 LV1 550 600 601 551 120 590 591 910 920 900 930 570 560 561 580 520 521 400 531 530 581 EXPLODED VIEW A21 A2 ...

Страница 21: ...T SHIELD SPTE HLS METAL D BOARD SHIELD 570 EBR37252602 Hand Insert PCB Assembly Sub M I LJ71A INTERFACE_1 and INTERFACE_2 580 EAY33982302 Power Supply Assembly YP20106DTV_JAPAN FREE 196 196 YUYANG TELECOM CO LTD 581 EAD38599102 Drawing Assembly switch socket Assy UL1015AWG22 6600F00001D SDDJE11600 590 EBR38656001 PCB Assembly Sub SUB T T LJ71A 2XLS7D JA AJLWLAX IR LED 591 MES38698301 Indicator MOL...

Страница 22: ...10 50V X7R 55TO 125C C124 0CC102CK41A C1608C0G1H102JT 1nF 5 50V C0G 55TO 125C 1 C125 0CK473CK56A C1608X7R1H473KT 47nF 10 50V X7R 55TO 125C C126 0CC560CK41A C1608C0G1H560JT 56pF 5 50V C0G 55TO 125C C127 0CC560CK41A C1608C0G1H560JT 56pF 5 50V C0G 55TO 125C C128 0CK473CK56A C1608X7R1H473KT 47nF 10 50V X7R 55TO 125C C129 0CK473CK56A C1608X7R1H473KT 47nF 10 50V X7R 55TO 125C C13 0CE106BF618 ESM106M016T...

Страница 23: ...R 55TO 125C C404 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C405 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C406 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C407 0CC102CK41A C1608C0G1H102JT 1nF 5 50V C0G 55TO 125C 1 C408 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C409 0CK104CK56A 0603B104K500CT 100nF 10 50V X7R 55TO 125C C5 0CK104CK56A 0603B104K500CT 100n...

Страница 24: ...V 5 2TO6V 40OHM 200MW SOD ZD906 0DZ560009GB BZT52C5V6S F 5 6V 5 2TO6V 40OHM 200MW SOD ZD908 0DZ560009GB BZT52C5V6S F 5 6V 5 2TO6V 40OHM 200MW SOD ZD909 0DZ560009GB BZT52C5V6S F 5 6V 5 2TO6V 40OHM 200MW SOD IC1 0IPRPPH024A TDA8024T 2 7TO6 5V 1 5mA 2 2TO3 2MHZ SO R T IC100 EAN33715803 LGE9689AD LF 300MVTO3 6V 300MVTO2 75V 300MV IC1000 0IMCRKE006B KIA278R33PI 4TO10V 3 3V 1 5W TO200IS ST 4P IC1002 0IP...

Страница 25: ...OHM R15 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R TP ROHM R150 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W 1608 R TP ROHM R152 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W 1608 R TP ROHM R159 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R16 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R TP ROHM R160 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R161 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1...

Страница 26: ...P PLS R320 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 1608 R TP PLS R321 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 1608 R TP PLS R322 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 1608 R TP PLS R323 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 1608 R TP PLS R325 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R326 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W 1608 R TP ROH R327 0RJ5600D677 MCR03EZPJ561 560OHM...

Страница 27: ... R950 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R TP ROHM R951 0RJ1002D677 MCR03EZPJ103 10KOHM 5 1 10W 1608 R TP ROH R952 0RJ1002D677 MCR03EZPJ103 10KOHM 5 1 10W 1608 R TP ROH R953 0RJ5601D477 MCR03EZPF562 5 6KOHM 1 1 10W 1608 R TP RO R954 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R TP ROHM R955 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R TP ROHM R956 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 ...

Страница 28: ...0MM 6631T20033C SMH200 5P SMH200 5P 220mM 2 00MM 5P UL1061 6631T25023R 6631T25023R SMH250 SMH250 140mM 2 50MM 13P 6631T25026L 4P TO TERMINAL 350 650 SMH250 35098T 600mM EAD38509801 8P 650 SMH200 08 SMH200 08 650mm 2 00MM 8P EAD38598801 SMH200 14 TUBE SMH200 14 SMH200 14 100MM 2 EAD38598901 SMH 15 TUBE SMH200 15 YEON HO SMH200 15 Y EAD38599001 10P SHIELD YDH200 10 YEON HO YDH200 10 EAD39242201 1 2 ...

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Страница 45: ...Aug 2007 Printed in Korea P NO MFL38623704 ...

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