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LG 42LY770M Service Manual
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LG 42LY770M Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LA4BY
MODEL : 42LY770M
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL68080465 (1410-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LY770M-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 42LY770M

  • 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 : LA4BY MODEL : 42LY770M 42LY770M-UA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL68080465 (1410-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ............... 8 TROUBLE SHOOTING GUIDE ............... 20 BLOCK DIAGRAM ................. 26 EXPLODED VIEW .................. 27 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 % 1) Temp. : -20 ~ 60 deg Storage Environment 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

    (1) Tool option menu, USB Download (S/W Update, Option and Service only) (2) Manual adjustment for ADC calibration and White balance. (3) Shipment conditions, Channel pre-set - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 (2) Connect each other LAN Port Jack. (3) Play Test (F9) button and confirm OK Message. (4) Remove LAN cable. - 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 0A 20 20 20 20 20 20 20 Chassis MODEL NAME(HEX) e. Checksum(LG TV): Changeable by total EDID data. LA4BY 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 e.
  • Page 11 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 LA4BY 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 e. Checksum(LG TV): Changeable by total EDID data. e. Checksum(LG TV): Changeable by total EDID data. HDMI1...
  • Page 12 3) If R gain or B gain is over 255, Readjust G gain less than 172, Conform to R gain is 255 or B gain is 255 - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 (1) Press Adj. key on the Adj. R/C, and then check Tool option. 36-49 * Tool option can be reconstructed by Software 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 5.4.2. Check the menu on in-start Step 4) If the system finds any AP like below PIC, it is working well. - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 6.1.1. Equipment & Condition ▪ Jig (Speaker out JIG) or Oscilloscope ▪ Power only mode - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 MAIN ASSY make sure that the insertion direction is right. When checking the RJP(<-->) be sure to use a direct cable. - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 (3) Check whether it is same their address numbers or not between b-LAN Label and (4) MAC Address on the pc. - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 METAL GND - Hi-pot TEST = POWER CORD GND & LIVE & NEUTRAL ▪ LEAKAGE CURRENT: At 0.5 mArms - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 (2) Adj. Computer (During auto adj., RS-232C protocol is needed) (3) Adjust Remocon (4) Video Signal Generator MSPG-925F 720p/216-Gray (Model: 217, Pattern: 78) - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Trouble Shooting Guide

    Check IIC line or replace IC8701 Communication status Check IR input state of IC8701 Check IR board 57pin Re-download PTC Micom - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 TU8900 Pin#4, 12 Check IF Signal Replace TU8900 TU8900 Pin#6, 14 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 This board has big problem because Main chip (LG1311, IC101) have some troubles. After checking thoroughly all path once again, You should decide to replace Main IC or not. - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Check TU8900 Pin 6, 14 Replace Tuner Check Audio AMP output Replace L5602,L5603,L5604,L5605 L5602,L5603,L5604,L5605 Replace IC5600 Check IC5600 Replace IC101 - 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 (LG1311, IC101) have some troubles. After checking thoroughly all path once again, You should decide to replace Main IC 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 (LG1311, IC101) have some troubles. After checking thoroughly all path once again, You should decide to replace Main IC or not. - 25 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Block Diagram

    BLOCK DIAGRAM - 26 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Exploded View

    Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 27 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 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 2014 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 M14 Symbol B THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M14-Display In/Out Copyright 2014 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 C THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M14-AV In/Out Copyright 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 2014.05.12 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14 DDR3-M0 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 32 2014.05.12 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR M14 DDR3-M1 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 33 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 34 LY770M-UA 2014.07.10 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 35 LY770M-UA 2014.07.14 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 36 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 37 LY770M-UA 2014.07.10 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 38 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 39 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 2014 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 AUDIO[ST] THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 41 LY770M-UA 2014.05.12 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 42 2014.05.12 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LOCAL DIMMING THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 43 LY770M-UA 2014.05.12 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 44 2014.05.12 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 45 2014.07.14 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 46 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR X66144103.cir/086.sht 14/10/24 @suppr THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. EXT. SPK @compC @refer @partN Copyright 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 48 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR 5V_ST/12V_ST THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 49 LY770M-UA 2014.07.10 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 50 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 51 LY770M-UA 2014.05.12 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 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...
  • Page 52 LY770M-UA 2014/10/14 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PILLOW LGE Internal Use Only Copyright 2014 LG Electronics Inc. All rights reserved. Only for training and service purposes...

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