1. Manuals
  2. Brands
  3. LG Manuals
  4. LCD TV
  5. 20LS7D - - 20" LCD TV
  6. Service manual

LG 20LS7D Service Manual

Hide thumbs Also See for 20LS7D:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LJ71A
MODEL : 20LS7D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
20LS7D-JA

Advertisement

Table of Contents
loading

Related Manuals for LG 20LS7D

Summary of Contents for LG 20LS7D

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LJ71A MODEL : 20LS7D 20LS7D-JA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    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 ....................- 2 -...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards.

  • Page 4: Specification

    SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range 3. Test method This specification sheet is applied to the 20”/ 23” Wide LCD (1) Performance : LGE TV test method followed Digital TV used LJ71A chassis. (2) Demanded other specification Safety : JQA Specification 2.
  • Page 5 5. Module Specification 5.1. 20”LCD Module (AUO T200XW02 V0) Item Typ. Unit Remark Display area 443.61 (H) *249.41(V) Outline dimension 472.0 (H) x 276.5 (V) x23.0 (D) Number of Pixels 1366 (H) x 768(V) 1Pixel=3RGB Cells Cell pitch 324.75μm (H) x 324.75μm (V) μm 1Pixel=3RGB Cells Color arrangement...
  • Page 6 6. Model Specification Item Specification Remark Analog-terrestrial Broadcasting system NTSC-M RF Input Channel VHF : 1~12 UHF : 13~62 CATV : C13~C38 Digital-terrestrial Broadcasting system ISDB-T RF Input Channel 000~999 CH. Logical CH Number Digital-BS/SC Broadcasting system ISDB-S RF Input Channel 000~999 CH.

  • Page 7: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 1. Application Range This specification sheet is applied to 20”/ 23” LCD TV which is manufactured in TV (or Monitor) Factory or is produced on the basis of this data. filexxx.bin (7) ..OK 2. Specification 1) The adjustment is according to the order which is designated and which must be followed, according to the plan which can be changed only on agreeing.
  • Page 8 4. Total Assembly line process 4.5. Power Consumption 1) Press “EYE” button on LG Adjust remocon and check 4.1. Adjustment Preparation whether LED color is amber or not. 2) Press “POWER” button on LG Ajust remocon to enter - Above 30 minutes H/run in RF no signal Stand-by mode.
  • Page 9 (If Pressed “EYE” button on LG ADJUST REMOCON, Color of Power LED will be Amber) 2) Press “IN-STOP” button on LG ADJUST REMOCON. It is executed 3~15 procedure automatically by Software program.(If pressed “IN-STOP” button, Color of “...
  • Page 10 5.2 EEPROM DATA READ (1) Signal Table Delay 100ms 128 Bytes (2) Command Set Adjustment contents CMD(hex) ADH(hex) ADL(hex) Details EEPROM READ 0-Page 0~7F Read 0-Page 80~FF Read 1-Page 0~7F Read 1-Page 80~FF Read 2-Page 0~7F Read 2-Page 80~FF Read 3-Page 0~7F Read 3-Page 80~FF Read * Purpose : To read the appointment Address of E...

  • Page 11: Trouble Shooting

    TROUBLE SHOOTING 1. No Power (LED indicator off) : [A] Process Fail Check 12V or Check short of Main B/D ST_5V of Power B/D. or Change Power B/D. Pass Fail Fail Check short of Re-soldering or Change Check Output of IC100, Q308.
  • Page 12 2. No RASTER : [B] Process Fail Check LED status Repeat A PROCESS. On Display Unit. Pass Fail Check Panel Link Change Panel Link Cable or Module. Cable or Module. Pass Fail Check Inverter Change Inverter Connector or Inverter. Connector or inverter.
  • Page 13 3. No RASTER on DTV Signal Repeat [A,B] process Pass Fail Check the input/ Check the P901. output of R918. Pass Fail Check the input/ Re-soldering or Change the defect part. output of R127. Pass Fail Check the input/ Re-soldering or change the defect part. output of IC100 Check the X100 Pass...
  • Page 14 4. No Raster on Component Signal Repeat [A, B] process. Pass Fail Check the input/ Check the J801. output of R806. Pass Fail Check Re-soldering or Change the defect part. the input/output of R121. Pass Fail Check the Re-soldering or change the input/output of IC100.
  • Page 15 5. No Raster on HDMI Signal Repeat [A, B] process. Pass Fail Re-soldering or change the Check the input/ defect part, Check the X100. output of IC100. Pass Check input source cable and jack. 6. No Raster on AV (Video, 7.
  • Page 16 8. No sound Fail Check the input Change the source input. Source. Pass Fail Re-soldering of Change the defect part. Check input/Output Check the X110 of IC100. Pass Fail Re-soldering or Change Check the input/ the defect part. output of IC500 Pass Fail Change Speaker.

  • Page 17: Wiring Diagram

    WIRING DIAGRAM - 17 -...

  • Page 18: Block Diagram

    BLOCK DIAGRAM 1. Digital - 18 -...
  • Page 19 2. Analog - 19 -...

  • Page 20: Exploded View

    EXPLODED VIEW - 20 -...

  • Page 21: Exploded View Parts List

    Frame Assembly 20LS7D-JA LJ71A 20” METAL MAIN SHIELD ASSY EBR38656501 PCB Assembly,Sub SUB T.T LJ71A 20LS7D-JA AJLWLAX CONTROL MEY38698401 Knob “MOLD ABS HF-350U MAIN/SMPS 6 20LS7D-JA 20” Control knob(JAPAN) EBR36653601 Hand Insert PCB Assembly,Sub SUB M.I LJ71A H2XLCD-H5JK AJPWLAX B-CAS MCK38699101 Cover MOLD HIPS 51SF 20LS7D-JA HIPS 51SF 20”...

  • Page 22: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 08. 06. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORs C124 0CC102CK41A C1608C0G1H102JT 1nF 5% 50V C0G -55TO+125C 1 C125 0CK473CK56A C1608X7R1H473KT 47nF 10% 50V X7R -55TO+125C 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R -55TO+125C C126 0CC560CK41A...
  • Page 23 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C176 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R -55TO+125C C406 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R -55TO+125C C407 0CC102CK41A C1608C0G1H102JT 1nF 5% 50V C0G -55TO+125C 1 C177 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R -55TO+125C C178...
  • Page 24 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs 0DSON00138A MMBD301LT1G 600MV 30V - - 1.5pF 200MW SOT23 0IPRPPH024A TDA8024T 2.7TO6.5V 1.5mA 2.2TO3.2MHZ SO R/T D100 0DS181009AA KDS181 1.2V 85V 300MA 2A 4NSEC 150MW SOT23 IC100 EAN33715803 LGE9689AD-LF 300MVTO3.6V,300MVTO2.75V,300MV...
  • Page 25 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1029 0RJ6801D477 MCR03EZPF682 6.8KOHM 1% 1/10W 1608 R/TP RO R150 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W 1608 R/TP ROHM R152 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W 1608 R/TP ROHM R1031 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1608 R/TP ROHM...
  • Page 26 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R226 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W 1608 R/TP ROH R321 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 1608 R/TP PLS R322 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 1608 R/TP PLS R227 0RJ3301D677 MCR03EZPJ332 3.3KOHM 5% 1/10W 1608 R/TP RO...
  • Page 27 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R700 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W 1608 R/TP ROHM R951 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W 1608 R/TP ROH R702 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W 1608 R/TP ROH R952 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W 1608 R/TP ROH...
  • Page 28 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L901 6210TCE001A Filter,Bead HB-1S2012-080JT 8OHM 2X1.25X1MM SW5005 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF R 6600F00001D SDDJE11600 AC 2C1P 250VAC 10A ON-OFF HORIZO CONNECTOR OTHERs J801 6630GG00114 UEX-DC-043 D-SUB 14P 1.27MM STRAIGHT FEMALE J900...
  • Page 45 Aug., 2007 P/NO : MFL38623704 Printed in Korea...

This manual is also suitable for:

20ls7d-ja

Table of Contents