LG 42LH20R Service Manual

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Owner's manual (270 pages)

User's manual & specification (270 pages)

Manual de usuario (124 pages)

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SERVICE MANUAL

CHASSIS : LP91A

MODEL : 42LH20R

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

North/Latin America

Europe/Africa

Asia/Oceania

42LH20R-MA

Internal Use Only

http://aic.lgservice.com

http://eic.lgservice.com

http://biz.lgservice.com

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Summary of Contents for LG 42LH20R

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 : LP91A MODEL : 42LH20R 42LH20R-MA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Page 2: Table Of Contents
PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ..............9 TROUBLE SHOOTING ................14 BLOCK DIAGRAM...................17 EXPLODED VIEW .................. 18 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
LDC Module 983 x 576 x 46 Unit : mm (Maker : LGD) 0.227 x 0.681 18 EEFL Coating Copyright © 2009 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
Page 7 56.25 148.5 HDTV 1080P 1920* 1080 67.432 59.94 148.350 HDTV 1080P 1920* 1080 67.5 60.00 148.5 HDTV 1080P Copyright © 2009 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
Page 8: Hdmi Input
148.5 HDTV 1080P 1920 x 1080 24.00 74.25 HDTV 1080P 1920 x 1080 33.75 30.00 74.25 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
1) Connect the download jig to D-sub(RGB) jack Click “(1)Read” tab, and then load download file(XXXX.bin) by clicking “Read”. - LH20/ LH30 Filexxx.bin Filexxx.bin Copyright © 2009 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
Page 11 ENTER( 6) ADC adjustment is executed automatically . 7) When ADC adjustment is finished, this OSD appear Copyright © 2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
Page 12: White Balance Adjustment
R/G/B gain and change the others 11) When adjustment is completed, Enter “COPY ALL”. 12) Exit adjustment mode using EXIT key on R/C. Copyright © 2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only...
Page 13 Dynamic Colour : Off (If you miss the upper condition, the coordinates of W/B can be lower than the spec.) Copyright © 2009 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
Page 14: Troubleshooting
Or Inverter Or Inverter Pass Check Output of IC802 Change IC802 Fail Pass Check LVDS Cable Change Module Fail Copyright © 2009 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
Page 15 Change the defect part Fail Of IC800 Pass Repeat [A], & [B] Process Repeat [A], & [B] Process Copyright © 2009 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
Page 16 Change the defect part. Of IC600. Pass Change Speaker. Check The Speaker. Fail Pass Check The Speaker Wire. Copyright © 2009 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
Page 18: 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. - 18 - LGE Internal Use Only Only for training and service purposes...
Page 28 Jan., 2009 P/NO : MFL60021513 Printed in Korea...

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42lh20r-ma

LG 42LH20R Service Manual

Table of Contents

SERVICE MANUAL

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