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LG 40LX770H Service Manual

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Download this manual See also: Owner's Manual
LED TV
SERVICE MANUAL
CHASSIS : LA5GG
MODEL : 40LX770H
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69373701 (1510-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
40LX770H-UA
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 40LX770H

  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LA5GG MODEL : 40LX770H 40LX770H-UA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69373701 (1510-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ..............8 TROUBLE SHOOTING GUIDE ............... 19 BLOCK DIAGRAM .................. 27 EXPLODED VIEW .................. 28 SCHEMATIC CIRCUIT DIAGRAM ........... APPENDIX - 2 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

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

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. - 5 - Copyright © LG Electronics. Inc. All rights reserved. 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 : ~ 85 % - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 HDTV 1080P 1920*1080 26.97 23.97 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.716 29.976 74.176 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    ▪ Manual adjustment for ADC calibration and White balance ▪ Shipment conditions, Channel pre-set 4.2.6. Inspection - In INSTART menu, check these keys. - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 ▪ Since embedded EDID data is used, EDID download JIG, HDMI cable and D-sub cable are not need. ▪ Adjust remocon - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 00 00 00 FC 00 4C 47 20 54 56 20 52 56 55 0A 20 20 20 LA5GG/J 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 ⓔ Checksum(LG TV): Changeable by total EDID data. ⓔ Checksum(LG TV): Changeable by total EDID data. ⓔ1 ⓔ2...
  • Page 11 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 LA5GG 00 00 00 FC 00 4C 47 20 54 56 20 52 56 55 0A 20 20 20 ⓔ Checksum(LG TV): Changeable by total EDID data. ⓔ Checksum(LG TV): Changeable by total EDID data. ⓔ1 ⓔ2...
  • Page 12 ▪ W/B Adj. must begin as start command “wb 00 00” , and finish as end command “wb 00 ff”, and Adj. offset if need - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 ▪ Press Adj. key on the Adj. R/C, then select Tool option * Tool option can be reconstructed by Software 10-19 20-35 36-49 50-79 80-119 Over 120 - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 5.4.1. Using RS232 Command Command Set ACK Transmission [A][l][][Set ID][][20][Cr] [O][K][x] or [N][G] 5.4.2. Check the menu on in-start - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Connect oscilloscope, you can see this waveform * Remark: Inspect in Power Only Mode and check SW version in a master equipment - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 (2) Turn to the Pro:Idiom channel (No. 96-1) (3) Check the video & sound ** Only displayed at “POWER ONLY” mode - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 METAL GND - Hi-pot TEST = POWER CORD GND & LIVE & NEUTRAL ▪ LEAKAGE CURRENT: At 0.5 mArms - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 (2) Select "Tool Option 1" and push "OK" key. (3) Punch in the number. (Each model has their number) - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Trouble Shooting Guide

    Check Q2302 application circuit or Check Q2302 output Voltage(13.2V) replace Q2302 Replace Cable Check LVDS Cable Check LCD Module Control board - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Replace L8907 or IC8900 Check tuner 1.8V power L8907 Replace Main IC(IC101) or main Check Mstar LVDS output board - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Check IF Signal TU8900 #6, 8, 16 Pin replace tuner. Check X101 Replace X101 and application circuit Replace IC101 - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Main chip (M14+) have some troubles. After checking thoroughly all path once again, You should decide to replace M14+ or not. - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Replace L5602,L5603,L5604,L5605 L5602,L5603,L5604,L5605 Replace IC5600 Check IC5600 After checking audio signal line, you should decide to replace item or not. - 23 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 This board has big problem because Main chip (M14+) have some troubles. After checking thoroughly all path once again, You should decide to replace M14+ or not. - 24 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 This board has big problem because Main chip (M14+) have some troubles. After checking thoroughly all path once again, You should decide to replace M14+ or not. - 25 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Check the speaker output wafer P5600. to replace item or not. Can you see the normal waveform? Check the connector & Speaker - 26 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Block Diagram

    BLOCK DIAGRAM - 27 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Exploded View

    Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 28 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M14+ Symbol A M14-Peripheral Copyright 2015 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14+ Symbol B THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M14-Display In/Out Copyright 2015 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14+ Symbol C THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M14-AV In/Out Copyright 2015 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14+ DDR3-(DE) THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 33 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14+ DDR3(DE) THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 34 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR VCC & GND THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 11/05/31 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 35 LX770H 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 36 LX770H 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HDMI THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 37 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR AV JACK THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 38 LX770H 2014.11.15 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR UART THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 39 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR IR / KEY THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 40 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 41 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR AUDIO[ST] THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 42 LX770H 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LVDS THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 43 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS LX770H 2014.11.15 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 44 LX770H 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR eMMC THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 45 2014.11.15 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. DATA Demod LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 46 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR ETHERNET HUB THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 47 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR X66791502.cir/086.sht 15/08/27 @suppr THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. EXT. SPK @compC @refer @partN Copyright 2015 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PTC / RJ45 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 49 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR +5V_ST Step Up THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 50 LX770H 2014.11.15 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. bLAN LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 51 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PHY / RJ45 LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 52 LX770H 2015.3.11 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR PRO:IDIOM THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2015 LG Electronics Inc. All rights reserved. Only for training and service purposes...