Download
Share
Print this page
LG 42LY750H Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. LED TV
  5. Centric 42LY750H
  6. Service manual
LG 42LY750H Service Manual

LG 42LY750H Service Manual

Hide thumbs Also See for 42LY750H:

Advertisement

Quick Links

Download this manual
LED TV
SERVICE MANUAL
CHASSIS : LB4BC
MODEL : 42LY750H
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL68104712 (1406-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LY750H-TA
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

Advertisement

loading

Related Manuals for LG 42LY750H

Summary of Contents for LG 42LY750H

  • 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 : LB4BC MODEL : 42LY750H 42LY750H-TA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL68104712 (1406-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    ADJUSTMENT INSTRUCTION ..............8 TROUBLESHOOTING GUIDE ..............16 BLOCK DIAGRAM ................. 24 EXPLODED VIEW .................. 25 SCHEMATIC CIRCUIT DIAGRAM .............. - 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

    (Movie/Photo/Music List) and SVC DVB-T/T2 Ethernet (2EA) RS232C(1EA) Ext. Speaker Out (1EA) Ext. Speaker out Ext.Volume Control(1EA) Ext. volume control - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 31.469 59.94 800*600 37.879 60.31 1024*768 48.363 60.00 1152*864 54.348 60.053 1280*1024 63.981 60.020 1360*768 47.712 60.015 1920*1080 67.5 - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Adjustment Instruction

    (2) Service Option Default Ref) ADC adj. RS232C Protocol_Ver1.0 (3) USB Download (S/W Update, Option, Service only) (4) ISP Download (Option) - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 ▪ If you want manual connection, Instart→ menu→ Network Setup→ Network Setting→Press OK Press Wired or Wireless connection key, then Network will be connected. - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 Check whether the key was downloaded or not at ‘In Start’ menu. (Refer to below). => Check the Download to CI+ Key value in LGset. - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX] LB3BC 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. ▪ RS-232C Command used during auto-adjustment. RS-232C COMMAND ⓔ1...
  • Page 12 ON, OFF. Default is inner(ON). By selecting OFF, you can adjust using RF signal in 204 Gray pattern. - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 3) You must remove the pairing with the TV Set by select "Mute" key on the Adjustment remote control. - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 2) Press any key on SVC Remote-control. 3) Check the LED status of the Check JIG. - IR LED(OK condition: blinking) (LED #1) - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 (2) Select "Tool Option 1" and push "OK" key. (3) Punch in the number. (Each model has their number) - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Troubleshooting Guide

    Check IIC line or replace Communication status. IC8700. Check IR input state of IC8700 Check IR board. 13pin. Re-download NEC Micom - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Check tuner 3.3V power L6502. Replace L6502. Check tuner 1.8V power IC6501 Replace IC6501. 2pin : 1.8V Check MTK LVDS output. Replace IC105. - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Replace TU6500. TU6500 Pin#3,4. Check DIF Signal Replace TU6500. TU6500 Pin#10,11. Check X100 and application Replace X100. circuit. Replace IC105. - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 This board has big problem because Main chip (MTK) have some troubles. After checking thoroughly all path once again, You should decide to replace MTK or not. - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 This board has big problem because Main chip (MTK) have some troubles. After checking thoroughly all path once again, You should decide to replace MTK or not. - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Replace L5402, L5403, L5404, L5405. L5403, L5404, L5405. Check IC5400. Replace IC5400. Check C352. (SIF signal to IC105) Replace IC105. - 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 (MTK) have some troubles. After checking thoroughly all path once again, You should decide to replace MTK or not. - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 This board has big problem because Main chip (MTK) have some troubles. After checking thoroughly all path once again, You should decide to replace MTK or not. - 23 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Block Diagram

    BLOCK DIAGRAM - 24 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 25 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. E x t e r n a l S P K . Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. POWER Copyright © 2014 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. Audio_AMP Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. E t h e r n e t H U B 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 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MID_MAIN_1 Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 2 0 1 4 . 0 2 . 1 2 xxLY750H-TA ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
  • Page 32 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. UART Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. FLASH_EMMC Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 2 0 1 4 . 0 2 . 1 2 xxLY750H-TA ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
  • Page 35 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MID_MAIN_3 Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. B l a n k Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
  • Page 38 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. CI_SLOT Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. HDMI Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR/KEY Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. USB/WIFI Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. C o m p o n e n t / a u d i o i n Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only...
  • Page 43 2 0 1 4 . 0 2 . 1 2 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR...
  • Page 44 2 0 1 4 . 0 2 . 1 2 xxLY750H-TA ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
  • Page 45 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. NEC_MICOM Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 46 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. ETHERNET/RH45 Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 2 0 1 4 . 0 2 . 1 2 xxLY750H-TA FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR EXT.
  • Page 48 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PRO:IDIOM Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 2 0 1 4 . 0 2 . 1 2 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS Copyright © 2014 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

This manual is also suitable for:

42ly750h-ta