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LG 42LV375H Service Manual

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LED LCD TV

SERVICE MANUAL

CHASSIS : LD03X
MODEL : 42LV375H
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL63263134 (1105-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LV375H-ZA
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 42LV375H

  • 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 LED LCD TV SERVICE MANUAL CHASSIS : LD03X MODEL : 42LV375H 42LV375H-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL63263134 (1105-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ..............7 TROUBLE SHOOTING GUIDE..............14 BLOCK DIAGRAM.................. 20 EXPLODED VIEW .................. 21 SCHEMATIC CIRCUIT DIAGRAM .............. Copyright © 2011 LG Electronics. Inc. All rights 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 © 2011 LG Electronics. Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    0.4845 mm x 0.4845 mm Back Light EDGE LED Display Colors 16.7 M colors Coating 3H(Hard coating), AG Copyright © 2011 LG Electronics. Inc. All rights reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 1920x1080 33.75 60.00 HDTV 1080i 1920x1080 33.72 59.94 HDTV 1080i 1920x1080 56.250 HDTV 1080p 1920x1080 67.5 HDTV 1080p Copyright © 2011 LG Electronics. Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Hdmi Input

    59.8 84.75 WXGA HDCP 1280*1024 63.595 60.0 108.875 SXGA HDCP/FHD model 1920*1080 67.5 60.00 138.625 WUXGA HDCP/FHD model Copyright © 2011 LG Electronics. Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Adjustment Instruction

    - Pattern level : 0.7 ± 0.1 Vp-p RS-232C Po rt - Image Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port Copyright © 2011 LG Electronics. Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 Check the model name Instart menu. -> Factory name displayed. (ex 42LE7500-ZA) e. Check the Diagnostics. (DTV country only) -> Buyer model displayed. (ex 42LE7500-ZA) Copyright © 2011 LG Electronics. Inc. All rights reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 4.2.1. Equipment & Condition - Jig (commercial check JIG) - Special 232C Cable for commercial check Jig - Power only mode Copyright © 2011 LG Electronics. Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 Error message refer to 5). 0x00 00 0x01 0x02 0F 0x03 01 0x04 45 0x05 6E 0x06 3E 0x07 Copyright © 2011 LG Electronics. Inc. All rights reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: White Balance Adjustment

    00 10 -> Gain adj. ja 00 ff -> Adj. data LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 jb 00 c0 Checksum: Changeable by total EDID data.
  • Page 12 After final inspection, press IN-STOP key of the Adjustment remote control and check that the unit goes to Stand-by mode. After final inspection, Always turn on the Mechanical S/W. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 12 - LGE Internal Use Only...
  • Page 13 1. RF input: Mono, 1 KHz sine wave signal, 100 % Modulation 2. CVBS, Component: 1 KHz sine wave signal 0.4 Vrms 3. RGB PC: 1 KHz sine wave signal 0.7 Vrms Copyright © 2011 LG Electronics. Inc. All rights reserved. - 13 - LGE Internal Use Only...

  • Page 14: Trouble Shooting Guide

    Check Q1504 application circuit (12V). or replace Q1504. Check LVDS FFC Cable. Replace Cable. Check LCD Module Control board. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Check Power of IC2802 (3.3 V / Check IC2800/ IC2803. Check IC2800/ IC2803. 1.8 V / 5 V). Copyright © 2011 LG Electronics. Inc. All rights reserved. - 15 - LGE Internal Use Only Only for training and service purposes...

  • Page 16: Rgb Input

    Check the register & Bead C127, C128, C129 L905/L906/L907 etc... Re-download EDID data or Check EDID Data. Replace IC901. Replace IC100. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 JK802 Pin 16, 17 Check Switch IC(IC800) output Replace IC800. signal. Check the IIC line IC800 to IC100. Replace IC100. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 IC502 operate normal. Replace IC502. IC500 operate normal. Replace IC500. IC100 operate normal. Replace IC100. Replace main board. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 Check the +5 V_ST Line. Replace the IC706. Check the IC705. Replace the IC705 Check the LED Clock Ass’y. Copyright © 2011 LG Electronics. Inc. All rights reserved. - 19 - LGE Internal Use Only Only for training and service purposes...

  • Page 20: Block Diagram

    BLOCK DIAGRAM Copyright © 2011 LG Electronics. Inc. All rights 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 rights reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 & FLASH Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 & AUD_IN/LVDS Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. BCM3556 & VIDEO Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HONG YEON HYUK DDR Memory THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 I R / E t h e r n e t THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. rol&IR/LED Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. NEC MICOM Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 2 0 1 0 . 1 2 . 2 0 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 A V I n t e r f a c e THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 2 0 1 0 . 1 2 . 2 0 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. UART&Switch Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR ETHERNET HUB THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 TUNER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. r ( F u l l N i m ) Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. P r o : I d i o m OiDiom Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS WAFER DS OUT Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR AUDIO AMP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 2 0 1 0 . 1 2 . 2 0 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR SCART&HP THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 2 0 1 0 . 0 1 . 2 3 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR PCMCI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

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