LG 37LC6D Service Manual
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LG 37LC6D Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LA75C
MODEL : 37LC6D
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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37LC6D-UM
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Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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  • Page 1: Service Manual

    North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD TV SERVICE MANUAL CHASSIS : LA75C MODEL : 37LC6D 37LC6D-UM MODEL : 37LG10 37LG10-UM CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. 6 X 1 ? V '...

  • Page 2: Table Of Contents

    TROUBLE SHOOTING.............................. 33 ALIGNMENT................................38 CIRCUIT DIAGRAM ..............................47 EDID WRITE ................................66 SYSTEM BLOCK DIAGRAM............................ 69 10 APPEARANCE INSPECTION ..........................71 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 3 1. PRODUCT OVERVIEW AND SPECIFICATIONS 1.1 SPECIFICATION Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Product Overview And Specifications

    1.2 Panel Specifications Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: Mechanical Function

    OEM Qisda 2C.40GK0.001 SPEAKER Z37LC6D-UM COV30057201 5F.MUMV0.031 OEM Qisda AUO MODULE T370XW02-VC Z37LC6D-UM ABJ56904904 6K.0GL02.041 Cabinet Assembly 37LC6D LA75C 37” Qisda OS LG LOGO ACQ56905403 6K.0GL03.012 Cover Assembly,Rear Z37LC6D LA75C 37” Qisda V0, B/C ASSY EBR57525401 5E.0GK03.001 PCB Assembly,Sub SUB T.T IR ASSY Z32LC6D-UM QISDA ODM MES49416701 4B.0GK01.001...
  • Page 12 2.2.1 Disassembly part: Base/Rear Cover/Keypad BD/IR BD/Main BD/Power BD/Side AV BD Step1: Remove Base Step2: Remove Rear Cover Step3: Remove Keypad BD and IR BD Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 Step4: Remove Power BD Setp5: Remove Main TOP SHD Ground wire Ground wire Setp6: Remove Main BD、Main BD BOM SHD Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 Step 7: Remove Side AV BD Step 8: Arrange the wire small cable clip big cable clip tape short electric tape long electric fireproof tape Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 2.2.2 Disassembly Part: Speaker Step 1: Remove Base Step 2: Remove Rear Cover Step 3: Remove Speaker Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 2.2.3 Disassembly Part: Bezel/Panel Step1: Remove Base Step2: Remove Rear Cover Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Step3: Remove Frame & PCBA Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 SHD *9 MAIN BOTTOM SHD –MAIN BD*4 EMI wire of IR –FRM DOWN*1 SCRW TAP RH W/FL M3*12L B-ZN 8F.00555.120 speaker—bezel*2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 PLASTIC NECK—NECK SKELETON*8 8F.EA226.130 SCRW TAP TRU M4*12L B-ZN 8-10 Plastic neck—plt base*5 SCRW TAP BIND M3*8L B-ZN 8f. SA324.8r0 hdmi—connector cover*2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 SCRW MACH PH W/FL M4*14L B-Z PANEL—FRM TOP*2 8F.1G326.140 PANEL—FRM DOWN*2 SCRW TAP PH W/FL PT M3*12L IR BD-BEZELx1 8f.UG324.120 Back cover—bezel*11 FRM TOP—bezel*2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 FRM DOWN—bezel*4 Stand cvr—bezel*1 Connector cover—back cover*4 Speaker COVER—bezel*2 Stand cvr-BACK COVER*2 Total Screw Type: 12 Total Screw Q’TY: 115 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 OPERATION FOR PACKING. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Fw Download Method

    Procedure of USB Download (Service Only, App. code) This method will update application code only. Step 1. Plug in USB with LG.ECC file in root directory. Step 2. USB Downloading appears on TV screen. Step 3. Download finished. Remove USB and restart TV.

  • Page 25: Introduction Of D/L Jig For Sub-Micron

    To Computer USB to I2C D/L PCBA D-sub 15 male to D-sub 15 male cable USB type “A” to type “A” cable Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Step 1 : connect D/L board to USB port. Install USB driver of D/L board. Step 2 : Install execution file of D/L Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Step 3 : Execute D/L program Step 4 : Press Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Step 5 : Select “Disable” Step 5 : Select “USB port” Step 5 : Select “WT61P8” Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Step 6 : Load FW “*.hex” Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Step 7 : Execute “Auto”. Then starting to D/L FW to sub-Micron Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Step 8 : Auto Programming and Auto Verify. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Step 9 : Check the D/L information whether there is any mismatch. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 Step 1: Enter Factory Set Menu Step 2: Enter icon “Version Information” Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 “MCU” Step 3: Enter Step 4: Read “SW Version” and “Build Date” Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Trouble Shooting

    Step 2. At setup menu, select Image Path for Software to download and click Update boot sector. Finally, click ok go back to iDev home menu. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 Step 3. Click down bottom. Step 4. Plug in RS-232 down-load cable. Press keypad “Volume →” and “menu” simultaneously, and then press “power on” bottom. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 MB & PB 12V +24V LCD_ON Path Check Panel Change D/L Fireware Panel to U1 Path Change U1 Change Power Board Change U1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 Check U17 Vcc & Check Path from Signal Path connector to U1 Check Path from U17 to U1 Download Firmware Again Change U1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: No Sound

    Check U9007 Vcc & path & Input path Check EEPROM ckt and re-write Check U9002 Vcc & Input output pin Check Speaker Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Alignment

    Plug in test pattern or select “Factory Utility” in factory mode, activate “Burn In Mode”. (See picture 3~4) c) Warm up at least 1 hour. Picture 1 Picture 2 Picture 3 Picture 4 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 First, correct signal level is a must. Front-end video digital level is calibrated and implemented as default in software. Since analog signals are processed via ADC, we need to calibration three signals “AV-CVBS” “PC” Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only...
  • Page 42 ↑ y ↑ Red offset ↑ x ↑ Green offset ↑ y ↑ Blue offset ↑ x ↓ y ↓ Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Press first item in factory menu “Auto Calibration” → “Calibrate Video” to execute calibration. (See picture 5~6) c) The signal level from equipment (without any load) show as picture 7. Picture 5 Picture 6 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 Press first item in factory menu “Auto Calibration” → “Calibrate PC” to execute calibration. (see picture 8~9) c) The signal level show as picture 10-1~10-3. (respective R, G and B signals) Picture 8 Picture 9 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 Picture 10-1 Picture 10-2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 46 Press first item in factory menu “Auto Calibration” → “Calibrate Component SD” to execute calibration. (See picture 11~12) c) The signal level show as picture 13-1~13-3. (respective Y, Cb and Cr signals) Picture 11 Picture 12 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 Picture 13-1 Picture 13-2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 Since the maximum luminance should be confirmed in the condition of maximum contrast and brightness, we can define an alternative to check luminance based on experienced value. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only...

  • Page 49: Circuit Diagram

    CIRCUIT DIAGRAM 7.1 Main Board Schematics 7.1.1 AV1, Component 1 and Component Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 7.1.2 PC Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 7.1.3 HDMI and HDMI switch Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 7.1.4 HDMI ESD Protection Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 7.1.5 SD and HD Video Input Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 7.1.6 Power Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 7.1.7 LVDS and GPIO Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 7.1.8 Sub MCU Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 57: Audio Processor

    7.1.9 Audio Processor Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Audio Amplifier

    7.1.10 Audio Amplifier Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 7.1.11 HD780 Power and Ground Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 7.1.12 DDR Interface Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 7.1.13 Tuner and Demodulator Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 7.1.14 IO & Reserved & Test Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 7.1.15 Key & IR & Remote & Side Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 7.2 Power Board Schematics Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 7.3 Keypad BD Schematics Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 7.4 IR BD Schematics Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 7.5 Side AV BD Schematics Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 68: Edid Write

    EDID WRITE 8.1 Summary 8.2 Write HDMI EDID data Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 8.3 EDID DATA 37” PC 37” HDMI1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 37” HDMI2 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 71: System Block Diagram

    Zoran 770/780 Switch ATSC + De-interlace + Com 2 Scaler+ LCD Panel Video Decoder D-sub HDMI1 TMDS HDMI Switch HDMI2 HDMI3 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 72: Audio Signal Flow

    Audio In STV8358FSX Audio In Sound Side Processor TQFP100 Com 1 Audio In STA333W Audio Amplifier Com 2 Audio In Audio In Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 73: 10 Appearance Inspection

    ① Must be no flash, weld lines, flow marks, shiny spots. Cosmetics of Back Cover ② The gates should look gook. Make it sink on surface. ③ Surface texture pattern must be same with the sample given by LG. Other follow LG ID spec. cosmetics ①...
  • Page 74 Add Kensington Lock hole on lower left corner. Kensington Lock Cable Cable management should not be too loose, or too tight. management Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Jul., 2008 P/NO : MFL39166213 Printed in Korea...

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