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LG M237WD Service Manual
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LG M237WD Service Manual

Lcd monitor tv
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See also: Owner's Manual
LCD MONITOR TV

SERVICE MANUAL

CHASSIS : LD84J
MODEL : M237WD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/Latin America
Europe/Africa
Asia/Oceania
M237WD-PMJ
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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Summary of Contents for LG M237WD

  • 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 MONITOR TV SERVICE MANUAL CHASSIS : LD84J MODEL : M237WD M237WD-PMJ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ...............12 TROUBLE SHOOTING ................15 BLOCK DIAGRAM...................24 DESCRIPION OF BLOCK DIAGRAM .............25 EXPLODED VIEW .................. 26 SVC. SHEET ....................Copyright 2009 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright 2009 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    Copyright 2009 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright 2009 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    50,000 HRS with 90% Confidence level Lamp Life 40,000 Hours (Min) Using Altitude 5,000 m (for Reliability) 3,000m(for FOS) Copyright 2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 C: Interval between top of active area and bezel Bezel D: Interval between bottom of active area and bezel Copyright 2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 Size (W x D x H) 271.2 x 193.2 x 108.4 Tilt Degree -5~15degree Tilt force 0.8~3.5kgf Appearance General Refer to Standard of LG(56)G1-1020 Copyright 2009 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 1600* 1200 75.0 60.0 162.0 1920* 1080 66.587 59.934 138.5 10.3 RGB EDID Data - Analog EDID_Product ID :22251 Copyright 2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 HDTV 1080P 1920* 1080 56.250 148.5 HDTV 1080P 1920* 1080 67.43 / 67.5 59.94 / 60 148.35/ 148.50 HDTV 1080P Copyright 2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 ***: year ex) when year 2008 : input “12” **** : CHECK SUM (deferent along Serial No, week, year) Copyright 2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...

  • Page 12: Adjustment Instruction

    *Manual ADC process using Service Remocon. After enter Service Mode by pushing “INSTART” key, execute “Auto- RGB” by pushing “ ” key at “Auto-RGB”. filexxx.bin Copyright 2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 • Measurement Condition : (100~240V@50/60Hz) • Confirm DPM operation at the state of screen without Signal 4.5 DDC EDID Write Model Name(M237WD-PMJ): • Connect D- sub Signal Cable to D-Sub Jack. Adjustment pattern (COMPONENT ) • Connect DVI Signal Cable to DVI Jack.
  • Page 14 0~7F Read 2-Page 80~FF Read 3-Page 0~7F Read 3-Page 80~FF Read *use: To read the appointment Address of E Copyright 2009 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...

  • Page 15: Troubleshooting

    Voltage Level 3.3V Check X101 Clock Replace X 101 12MHz Replace IC 106 Flash Memory Wave form of X101 Copyright 2009 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 Check L VDS Cable for damage or ope n Replace Ca ble con ductors . Check L CD Module Control board (Refer to Module CAS) Copyright 2009 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 #8(TXEC+) , #9(TXEC-) , #20(TXOC+) , #21(TXOC-) Check L CD Module Control board Refer to Mo dule CAS Wave form of X400 Copyright 2009 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Component Video Trouble Shooting

    Wave form of Comp Pb Wave form of Comp Pr Wave form of C129 Wave form of C126 Wave form of C124 Copyright 2009 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...

  • Page 19: Rgb Video Trouble Shooting

    Wave form of R673(Vsync) Wave form of R673(Vsync) Wave form of R105/C122 Wave form of R104/C121 Wave form of R119/C119 Copyright 2009 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...

  • Page 20: Av Video Trouble Shooting

    C137, C134, C135 C137, C134, C135 IC101 has problem Wave form of R625(S-video) Wave form of R626(S-video) Wave form of R611(CVBS) Copyright 2009 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...

  • Page 21: Hdmi Video Trouble Shooting

    Check HD CP Key NVRAM (IC105) Replace IC105 Power & I2 C Sig nal (#5, #6) Replace Ms tar (IC101) Copyright 2009 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Replace IC 500 L502, L503, L504, L505 Check Sig nal from IC101 Replace IC 101 (R130, R131, R1021, R1022) 2009 Copyright LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 Appendix 1. GPIO Path. 2009 Copyright LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...

  • Page 24: Block Diagram

    BLOCK DIAGRAM Copyright 2009 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...

  • Page 25: Descripion Of Block Diagram

    - Input 5V,15V from Power Board is converted to 3.3V,2.6V,1.8V,1.25V,1.2V by Regulator and DC/DC Converter Supply power to Module,Audio Amp and IC Copyright 2009 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: 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. - 26 - LGE Internal Use Only Only for training and service purposes...

  • Page 27: Schematic Diagram

    SCHEMATIC DIAGRAM MAIN Copyright 2008 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 Copyright 2008 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 TUNER/ DEMODULELATOR Copyright 2008 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 LVDS/ CONTROL Copyright 2008 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 INTERFACE Copyright 2008 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 POWER Copyright 2008 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 HDMI / DVI Copyright 2008 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 Copyright 2008 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 LED_IR_HP Copyright 2008 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 CONTROL KEY Copyright 2008 LG Electronics. Inc. All right reserved. - 36 - LGE Internal Use Only Only for training and service purposes...
  • Page 37 Jan., 2009 P/NO : MFL49414510 Printed in Korea...

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