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LG 32LH20D Service Manual
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LG 32LH20D Service Manual

LG 32LH20D Service Manual

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SERVICE MANUAL

CHASSIS : LB91A
MODEL : 32LH20D
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL60020303 (0904-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
32LH20D-AA
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Summary of Contents for LG 32LH20D

  • Page 1: Service Manual

    Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD TV SERVICE MANUAL CHASSIS : LB91A MODEL : 32LH20D 32LH20D-AA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL60020303 (0904-REV00) Printed in Korea...
  • Page 4 SAFETY PRECAUTIONS NOTE: Use with this receiver only the test fixtures specified in this service manual. Electrostatically Sensitive (ES) Devices.
  • Page 5 Removal At IC Connections Replacement At Other Connections...
  • Page 10 filexxx.bin Please Check the Speed : To use speed between from 200KHz to 400KHz filexxx.bin (8) ……….OK...
  • Page 16 2009.01.31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MSTAR-S6 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 17 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MSTAR_S6 MAIN_2 Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 18 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. DDR2 DDR2 Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 19 EAX59793902(0) ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TUNER Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 20 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. INTERFACE INTERFACE Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 21 2009.01.31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 22 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI HDMI Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 23 2009.01.31 EAX59793902(0) ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 24 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER POWER Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 25 EAX59793902(0) 2009.01.31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright ⓒ 2009 LG Electronics Inc. All right reserved. Only for traning and service purposes LGE Internal Use Only...
  • Page 27 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 28 Power No Video/ replace voltage? No audio Board ( 5V,12V,20V MAIN B/D or 24V…) Replace Power Board and repair parts Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 29 Normal Contact with signal distributor Picture? or broadcaster (Cable or Air) Check Normal Tuner soldering Picture? Close Replace Main B/D Close Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 30 Request repair for external device/cable RGB/ Check external External device device and Replace Main B/D HDMI/DVI /Cable error cable normal Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 31 (Check normal operation of Main B/D normal? External Input, Component, HDMI/ RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 32: Power Error

    If mechanical power switch off → Doesn’t turn on by remote control → Doesn’t appear LED light Please refer to the A21 Page Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 33 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 34: Audio Error

    Power Board Cancel OFF and describe Replace Power Board and repair parts Check Disconnection Replace MAIN Board Speaker disconnection Replace Speaker Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 35 External Input Connect and check Normal signal error) other external audio? Check and fix device external device Check and fix external device Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 36 Signal? Operation Output signal Connector solder (Key PCB + tool ) Close Close Repair/Replace Move Local switch B/D Power problem Section Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 37: Function Error

    - S/W Version RGB,HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 38 ※ Describe the basis of the description (For models without any fix information, in “Part related to nose” in the Owner’s provide the description) Manual. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 39 Zoom part with Replace module exterior damage damage Cabinet Replace cabinet damage Remote controller Replace remote controller damage Stand Replace stand dent Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 40 AV / Component / RGB, HDMI-PC/ HDMI-DTV AV Audio out / No Audio (SPDIF) USB / Remocon Problem USB no connect / Remocon Intelligent Sensor Intelligent Sensor Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

  • Page 41: Nand Flash

    Replace MAIN B’D IC102 Replace MAIN B’D IC103 Replace MAIN B’D Replace MAIN B’D IC100 NAND FLASH Serial Flash IC300, IC301 DDR2 Memory Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 42 MAIN B’D L810 = 12V ? Replace MAIN B’D Q805 Check LVDS Cable Replace Main Board OK ? Replace LVDS Cable Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 43 Replace MAIN B’D IC1103 MAIN B’D L1113 = 1.8V ? Replace MAIN B’D IC1105 MAIN B’D X1101 Clock ? Replace MAIN B’D X1101 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 44 Replace MAIN B’D IC1103 MAIN B’D L1113 = 1.8V ? Replace MAIN B’D IC1105 MAIN B’D X1101 Clock ? Replace MAIN B’D X1101 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 45 Replace MAIN B’D JK402 Video Signal ? Check MAIN B’D C217 Replace Video Signal ? MAIN B’D C217 Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 46 Replace MAIN B’D JK404 Video Signal ? Check MAIN B’D C211 Replace Video Signal ? MAIN B’D C211 Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 47 C201 (Pb) Replace C202 (Pr) MAIN B’D C200 or C203 or C201 or C202 Video Signal ? Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 48 C215 (Pb) Replace C216 (Pr) MAIN B’D C214 or C209 or C215 or C216 Video Signal ? Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 49 Check MAIN B’D C207 (Video) Replace R2030 (HSYNC) MAIN B’D C207 or R2030 or R2031 R2031 (VSYNC) Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 50 Check MAIN B’D C2016 (RED) C2017 (GREEN) Replace C2018 (BLUE) MAIN B’D C2016 or C2017 or C2018 Video Signal ? Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 51 Check the ADJUST MENU (Refer to Adjustment Spec) EDID OK ? Replace MAIN B’D IC601 (HDCP KEY) Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 52 MAIN B’D JACK Check JK600 -> HDMI1 JK601 -> HDMI2 JK602 -> HDMI3 JK603 -> HDMI4 Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 53 L705 Pin #1 Check P700 Cable Replace MAIN B’D IC701 L704 Pin #2 PWM Signal ? Replace MAIN B’D IC 701 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 54 2009. 2 . 1 Digital TV No Audio Problem LCD TV Symptom 14/25 Revision Digital TV Video OK ? Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 55 Analog TV Video OK ? Check MAIN B’D Replace MAIN B’D IC100 R2046 Signal (SIF) MAIN B’D Replace MAIN B’D IC1102 L1101 Signal (SIF) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 56 Replace MAIN B’D JK402 MAIN B’D C2011 (Right Sound) Replace MAIN B’D IC 100 C2012 (Left Sound) signal ? Check MAIN B’D C229, C230 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 57 Replace MAIN B’D JK402 MAIN B’D C2008 (Right Sound) Replace MAIN B’D IC 100 C2009 (Left Sound) signal ? Check MAIN B’D C2008, C2009 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 58 Replace MAIN B’D JK402 MAIN B’D C229 (Right Sound) Replace MAIN B’D IC 100 C230 (Left Sound) signal ? Check MAIN B’D C229, C230 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 59 Replace MAIN B’D JK402 MAIN B’D C2013 (Right Sound) Replace MAIN B’D IC 100 C2014 (Left Sound) signal ? Check MAIN B’D C2013, C2014 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 60 Replace MAIN B’D JK401 MAIN B’D C2015 (Right Sound) Replace MAIN B’D IC 100 C2016 (Left Sound) signal ? Check MAIN B’D C2015, C2016 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 61 Check the ADJUST MENU Download EDID EDID OK ? (Refer to Adjustment Spec) Check the HDMI Cable Replace MAIN B’D IC100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 62 Check the SPDIF Cable Check MAIN B’D JK403 Replace MAIN B’D JK403 Check MAIN B’D R2305 PWM Signal ? Replace MAIN B’D IC 100 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 63 JK406 Pin #1 5V ? Check MAIN B’D Replace MAIN B’D IC808 R826 5V ? Check MAIN B’D Replace POWER B’D R848 12V ? Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 64 24/25 Revision Check MAIN B’D P5001 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 65 25/25 Revision Check MAIN B’D P5001 Replace it Wafer & Connector Check IR B’D P1 Wafer Replace IR B’D & Connector Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only...

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32lh20d-aa