LG 42LH30 Service Manual
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LG 42LH30 Service Manual

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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : LA92A
MODEL : 42LH30
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
North/Latin America
Europe/Africa
Asia/Oceania
42LH30-UA
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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Summary of Contents for LG 42LH30

  • 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 : LA92A MODEL : 42LH30 42LH30-UA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................14 BLOCK DIAGRAM.................. 20 EXPLODED VIEW .................. 21 SVC. SHEET ....................Copyright © 2009 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Product Safety

    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

    Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the Copyright © 2009 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only...
  • 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

    2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : 0 ~ 85 % Copyright © 2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P Copyright © 2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P Copyright © 2009 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...

  • Page 9: Adjustment Instruction

    - xb 00 60 [Change input source to RGB(1024*768)] - ISP Download(Option) - ad 00 10 [Adjust 1024*768 RGB] - ad 00 90 End adj. Copyright © 2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 6) If ADC calibration is failure, after recheck ADC pattern or condition retry calibration. Error message refer to (v) Copyright © 2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: White Balance Adjustment

    00 1f -> Gain adj. complete *(wb 00 20(start), wb 00 2f(end)) -> Off-set adj. wb 00 ff -> End white balance auto adj. Copyright © 2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only...
  • Page 12 Test-pattern: ON, OFF. Default is inner(ON). By selecting OFF, you can adjust using RF signal in 216 Gray pattern. Copyright © 2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 1) Push "IN-START" key in service remote controller. 2) Select "Tool Option 1" and Push “OK” button. 3) Punch in the number. (Each model has their number.) Copyright © 2009 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only...

  • Page 14: Troubleshooting

    Check IC704 output voltage Replace IC704. 3.3V Check Mstar LVDS output Replace Mstar(IC100) or Main board. R812, R813,..., R821 Copyright © 2009 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Check IC1005(19”, 22”) Check CVBS signal. Replace Tuner. TU1001 #19 Pin Check Mstar LVDS output Replace Mstar(IC100) or Main board. Copyright © 2009 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...

  • Page 16: Component Video

    C113, C108, C114, R146, R149 If no problem, check signal line. Check Mstar LVDS output Replace Mstar(IC100) or Main board. Copyright © 2009 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 Replace Main board. If no problem, check signal line. Check Mstar LVDS output Replace Mstar(IC100) or Main board. Copyright © 2009 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 Check Connector & P600 Replace connector if found to be damaged. Check speaker resistance Replace speaker. and connector damage. Copyright © 2009 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 Check SIF buffer signal. Check SIF Signal line. Follow procedure All source audio Replace Mstar(IC100) trouble shooting guide. or Main board. Copyright © 2009 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...

  • Page 20: Block Diagram

    BLOCK DIAGRAM Half-NIM Tuner Copyright © 2009 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...

  • Page 21: 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. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Copyright © 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Jan., 2009 P/NO : MFL41946814 Printed in Korea...

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