LG 55UF680 Series Service Manual
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LG 55UF680 Series Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LD59L / LD5ZM
MODEL : 49/55UF680*
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69305902 (1510-REV01)
North/Latin America
Europe/Africa
Asia/Oceania
49/55UF685*
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
49/55UF680*-ZA
49/55UF685*-ZB
Printed in Korea

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  • 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 : LD59L / LD5ZM MODEL : 49/55UF680* 49/55UF680*-ZA 49/55UF685* 49/55UF685*-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69305902 (1510-REV01) Printed in Korea...
  • Page 2 ADJUSTMENT INSTRUCTION .............. 11 BLOCK DIAGRAM .................. 21 EXPLODED VIEW .................. 28 SCHEMATIC CIRCUIT DIAGRAM ........... APPENDIX TROUBLE SHOOTING GUIDE ..........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

    SAT10&7 68.5E, INTELSAT15 85.2E, INTELSAT1R 50.0W, INTEL- SAT903 33.5W, INTELSAT904 60.0E, NILESAT 7.0W, NSS12 57.0E, THOR 0.8W, TURKSAT 42.0E,YAMAL201 90.0E, OTHER - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 : 1/2, 2/3, 3/4, 5/6, 7/8 DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10 Input Voltage AC 100 ~ 240V 50/60Hz - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 HDTV 1080P 1920*1080 26.97 23.976 74.176 HDTV 1080P 1920*1080 33.75 30.000 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 50.00 594.00 UDTV 2160P(DVB) UHDonly(Port1) 4096*2160 135.00 59.94 593.41 UDTV 2160P UHDonly(Port1) 4096*2160 135.00 60.00 594.00 UDTV 2160P UHDonly(Port1) - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 UDTV 2160P UHD only 4096*2160 53.95 23.97 296.703 UDTV 2160P UHD only 4096*2160 54.00 24.00 297.00 UDTV 2160P UHD only - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Adjustment Instruction

    Widevine → CI → HDCP20 ▪ Play: Press Enter key ▪ Result: Ready, Test, OK or NG ▪ Printer Out (MAC Address Label) - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Equipment Setting

    4) Check the model name Instart menu. → Factory name displayed. (ex 47LB650V-ZA) 5) Check the Diagnostics.(DTV country only) → Buyer model displayed. (ex 47LB650V-ZA) - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Manual Adjustment

    ⓒ Month, Year: Controlled on production line: ex) Monthly : ‘01’ → ‘01’, Year : ‘2015’ → ‘19’ EDID Block 1, Bytes 128-255 [80H-FFH] ⓓ Model Name(Hex): LGTV ⓔ Checksum(LG TV): Changeable by total EDID data. ⓕ Vendor Specific(HDMI) 61 5D 5E 5F 29 3D 06...
  • Page 14 38 2D 40 58 2C HDMI1 HDMI2 00 FD 00 3E 1E 0A 20 00 FC 00 4C 47 0A 20 - 14 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 If it doesn’t change the value, the sensor is also C0 18 defected one. D0 00 01 1D 00 51 D0 1E You have to replace it. - 15 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: White Balance Adjustment

    4) Select Model in “V-com adj. Program” and begin “V-com adj.”. 5) When V-com adj. is complete(OK). 6) Remove probe and RS-232C to USB cable to complete adjustment. - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 B Gain Medium R Cut G Cut B Cut R Gain G Gain Warm B Gain R Cut G Cut - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Back light of IOP module moving. (3) Confirm the Local Dimming mode. (4) Press “exit” Key. - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 - After final inspection, press In-Stop key of the Adjustment remote control and check that the unit goes to Stand-by mode. - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 (2) Select "Tool Option 1" and push "OK" key. (3) Punch in the number. (Each model has their number) - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Block Diagram

    BLOCK DIAGRAM 1. LM14A - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 2. I2C - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 FILTER IF_N ADC_I_INN AM2 [VIFM] [IF_N] 7 TUNER_SIF AK1[SIFP] [TU_SIF_TU] 8 TU_CVBS AC6[CVBS0] [TU_CVBS_TU] 9 IF_AGC AK3[IF_AGC] [IF_AGC_TU] 3 - 23 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 4. Video/Audio In - 24 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Audio Out

    5. Audio Out - 25 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 6. HDMI CEC_REMOTE - 26 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 7. USB / WIFI / M-REMOTE / UART - 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 LD5ZM (LM14A+URSA11) LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 30 2015-01-23 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN1_SYSTEM 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 31 2014-11-06 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN2_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 32 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A DDR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 2015-01-08 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN4_EXT_IN/OUTPUT 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 2014-11-13 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A_GND LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 2014-11-13 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR PCMCI 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 2015-01-23 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A_PWR_1_13V_only LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LM15U_PWR_2_ALL 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 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 2015-01-14 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 © 2015 LG Electronics. Inc. All rights reserved. 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. JACK_COMMON_H_W/O HP LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR/KEY LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 UF64/6800 2015-01-21 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 43 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. SCART JACK_H SCART_JACK_H LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 44 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LAN_H 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 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR NTP_AMP 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 46 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR SCART AMP 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 2014-11-06 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TU_CIRCUIT LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 48 2015-01-05 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR TU_SYMBOL_H 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 49 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 50 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Vx1 51P LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 LM14A 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 52 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR CLIP&Vx1_CAP 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 53 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Tuner_GND_for UF64 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 54 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR URSA11 INPUT 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 55 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. URSA11_DDR 15/01/21 LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 56 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR URSA11_GPIO 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 57 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR URSA11_DCDC THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 15/01/21 LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 58 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. URSA11_Power LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 59 LD59L (LM14A) LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 60 2015-01-23 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN1_SYSTEM 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 61 2014-11-06 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN2_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 62 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A DDR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 63 2015-01-08 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR MAIN4_EXT_IN/OUTPUT 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 64 2014-11-13 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A_GND LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 65 2014-11-13 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR PCMCI 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 66 2015-01-23 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM14A_PWR_1_13V_only LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 67 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LM15U_PWR_2_ALL 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 68 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MICOM LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 69 2015-01-14 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 © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 70 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. JACK_COMMON_H_W/O HP LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 71 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR/KEY LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 72 UF64/6800 2015-01-21 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 73 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. SCART JACK_H SCART_JACK_H LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 74 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LAN_H 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 75 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR NTP_AMP 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 76 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR SCART AMP 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 77 2014-11-06 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TU_CIRCUIT LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 78 2015-01-05 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR TU_SYMBOL_H 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 79 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 80 2015-01-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. T-Con LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 81 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. EPI WAFER LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 82 LM14A 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 83 2014-09-16 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR LM14A_ONLY 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 84 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Tuner_GND_for UF64 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 86: Troubleshooting Guide

    Trouble shooting guide LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 87 Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GCSC System for these model. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 88 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 89 No Video/ Normal voltages of Power replace No audio voltage? Board ( 13V) MAIN B/D Replace Power Board and repair parts LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 90 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 91 Request repair for external device/cable Check external External HDMI Replace Main/T-con B/D device and device/Cable error cable normal LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 92 (Check normal operation of Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 93: Power Error

    Measure voltage of each output of Power B/D Normal? ※ Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 94 Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 95 Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 96 Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 97: Function Error

    (Power B/D don’t have problem) If R/C operate, Normal Close Explain the customer operating? cause is interference from light in room. Replace R/C LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 98 Down load the Firmware * If you conduct the loop at 3times, change the MR15. * INSTART MENU14.RF remote control Test3. Firmware download LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 99 Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value is “NG”? Close Change the Wifi assy LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 100 - S/W Version HDMI/ DVI, Optical Check and fix Replace Main B/D Fix in Recognition external device/cable accordance error with technical information LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 101 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 102 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 103 A-3/5 Defected Type caused by T-Con/ Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 104 Remote control operation checking method Motion Remote operation checking method D. Function error Wifi operation checking method LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 105: Video/Normal Audio

    After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 106 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 107: Channel Tuning

    <ALL MODELS>  Advanced Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 108 <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 109 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 110 Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 111 Check Link Cable(EPI) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 112 Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..) 4.Video error (Classification of MODULE or Main-B/D!) LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 113 Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack A - 1/5 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 114 Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 115 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 116 Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage A - 4/5 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 117 Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect A - 5/5 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 118 Revised Content Check front Power Indicator date <ALL MODELS> ST-BY condition: On or Off Power ON condition: Turn Off LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 119 Established B. Power error _No power symptom date Revised Check power input voltage Content date <ALL MODELS> Check the DC 13.2V. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 120: Entry Method

    Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 121: Audio Error_No Audio/Normal Video

    1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select TV Speaker LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 122 3.Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 123 3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 124 Checking order to check motion remote/wifi Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 16 A23/A24 LGE Internal Use Only Copyright ⓒ 2015 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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