LG 55UG870T Service Manual

Hide thumbs Also See for 55UG870T:

Owner's manual (65 pages)

Manual (39 pages)

Owner's manual (33 pages)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

Table of Contents

Quick Links

Download this manual

LED TV

SERVICE MANUAL

CHASSIS : LB53V

MODEL : 55UG870T

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL68704903 (1503-REV00)

North/Latin America

Europe/Africa

Asia/Oceania

55UG870Y

Internal Use Only

http://aic.lgservice.com

http://eic.lgservice.com

http://biz.lgservice.com

55UG870T-TA

55UG870Y-TA

Printed in Korea

Table of Contents

Need help?

Do you have a question about the 55UG870T and is the answer not in the manual?

Questions and answers

Summary of Contents for LG 55UG870T

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 : LB53V MODEL : 55UG870T 55UG870T-TA 55UG870Y 55UG870Y-TA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL68704903 (1503-REV00) Printed in Korea...
Page 2 ADJUSTMENT INSTRUCTION .............. 13 BLOCK DIAGRAM .................. 23 EXPLODED VIEW .................. 34 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 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
Audio Input DVI Audio, Component, AV1 SPDIF out SPDIF out USB Input For My Media(Movie/Photo/Music List) or For SVC - 6 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 7 HDTV 1080I 1920*1080 33.75 60.00 74.25 HDTV 1080I 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 8 593.41 UDTV 2160P 8 bit / YCbCr 4:2:0 4096*2160 135.00 60.00 594.00 UDTV 2160P 8 bit / YCbCr 4:2:0 - 8 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 9: Hdmi Input
HDTV 2160P 2D to 3D, Top & Bottom(half), Side by Side(half) (8 bit, YCbCr 4:2:0) 135.00 60.00 594.00 HDTV 2160P - 9 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 10 56.25 50.00 148.50 Side-by-side(half) Secondary(HDTV 1080P) Top-and-Bottom Primary(HDTV 1080P) 67.43 / 67.50 59.94 / 60.00 148.35/148.50 Side-by-side(half) Secondary(HDTV 1080P) - 10 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 11 2D to 3D, Side by Side(half), Top & Bottom 1920*1080 33.71 29.97 74.18 HDTV 1080P 2D to 3D, Side by Side(half), Top & Bottom - 11 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 12 Single Frame Frame Column Side by Side Top & Bottom Checker board 2D to 3D Sequential Packing Interleaving Interleaving iii. - 12 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 13: Adjustment Instruction
(2) Connect each other LAN Port Jack. (3) Play Test (F9) button and confirm OK Message. (4) Remove LAN cable. - 13 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 14 3.6. WIFI MAC ADDRESS CHECK (1) Using RS232 Command H-freq(kHz) V-freq.(Hz) Transmission [A][I][][Set ID][][20][Cr] [O][K][X] or [NG] (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: Manual Adjustment
60 3E 1E 88 3C 00 0A 20 20 20 20 20 20 00 00 00 FC ⓔ Checksum(LG TV): Changeable by total EDID data. 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 A0 ⓕ...
Page 16 * Checksum for Non 3D model (HDMI 1/2/3) HDMI Deep Color On HDMI Deep Color Off Input FFh (Checksum) FFh (Checksum) HDMI1 HDMI2 HDMI3 - 16 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 17 * Checksum (HDMI 1/2/3) HDMI Deep Color On HDMI Deep Color Off Input FFh (Checksum) FFh (Checksum) HDMI1 HDMI2 HDMI3 - 17 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 18: White Balance Adjustment
* Checksum (HDMI 1/2/3) HDMI Deep Color On HDMI Deep Color Off Input FFh (Checksum) FFh (Checksum) HDMI1 HDMI2 HDMI3 - 18 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 19 - After Aging Start, Keep the Power ON status during 5 Minutes. - In case of LCD, Back-light on should be checked using no signal or Full-white pattern. - 19 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 20 ▪ AUO, INX, Sharp, CSOT, BOE (Cool :13000 K) Cool Medium Warm Target (3) Don't wear a 3D Glasses, Check the picture like below. - 20 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 21 - After final inspection, press In-Stop key of the Adjustment remote control and check that the unit goes to Stand-by mode. - 21 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 22 2) Select "Tool Option 1" and push "OK" key. 3) Punch in the number. (Each model has their number.) - 22 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 27 4. URSA9 Data_Format_0 Data_Format_1 I2C_SCL6 I2C_SDA6 HTPDn_IN LOCKn_IN - 27 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 34: Exploded View
Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Stand Base Stand+Head Stand Neck - 34 - Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
Page 35 2014-12-17 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 36 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM15U POWER 11/05/31 LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 37 2014-12-18 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN3_DDR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 38 2014-11-20 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 39 2014-1-21 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM15U_GND LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 40 2014-10-17 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 41 2014-00-01 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LM15U_PWR_1_UHD LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 42 2014-11-26 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 43 2014-12-30 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 44 2014-11-04 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 45 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. JACK_COMMON_V JACK_COMMON_V LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 46 2014-12-25 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 47 2014-12-10 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. USB3_HUB LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. 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. SCART_JACK_V SCART_JACK_V 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 LAN_V THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LAN_V LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 50 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR STM_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 51 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 52 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 53 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR HP_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 54 JAPAN B-CAS 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 55 2014-12-30 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 56 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR 67_01 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. TU_SYMBOL_V_DVB LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 57 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 58 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 59 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR Vx1 41P 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 60 2014-11-17 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 61 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR RS232C 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 U_LVDS 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 63 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 4th layer 2013.12.17 URSA7_DDR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 64 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2013.12.17 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 65 2013.12.17 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. U_Power LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 66 FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2013.12.17 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 67 ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR UG87 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 70 Main processor_(LM15U), DDR Memory eMMC Memory Micom for Key/IR sensing T-CON B/D Audio AMP Audio B/T Wifi <SIZE: 254X183> Local Key +IR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 71 Micom for Key/IR sensing Power Audio AMP From PSU FRC IC_(URSA9) DDR memory Audio B/T Wifi <SIZE: 300X183> Local Key +IR Local Key +IR LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 72 Micom for Key/IR sensing Power Audio AMP From PSU FRC IC_(URSA9) B/T Wifi DDR memory Local Key +IR Local Key +IR Audio <SIZE: 300X183> LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 73 Main PCB T - CON IR Jog Key ASSY BT/Wifi Combo ASSY BT/Wifi Combo ASSY IR Jog Key ASSY To Main LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 74 Main PCB T - CON BT/Wifi Combo ASSY IR Jog Key ASSY BT/Wifi Combo ASSY IR Jog Key ASSY To Main LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 75 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 rights reserved. Only for training and service purposes...
Page 76 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 rights reserved. Only for training and service purposes...
Page 77 Power Normal No Video/ replace Board ( 3.5V,12V, voltage? No audio MAIN B/D 24V…) Replace Power Board and repair parts LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 78 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 rights reserved. Only for training and service purposes...
Page 79 Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 80 (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 rights reserved. Only for training and service purposes...
Page 81: 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 rights reserved. Only for training and service purposes...
Page 82 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 rights reserved. Only for training and service purposes...
Page 83 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 rights reserved. Only for training and service purposes...
Page 84 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 rights reserved. Only for training and service purposes...
Page 85: Function Error
(Power B/D don’t have problem) If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 86 Down load the Firmware * If you conduct the loop at 3times, change the M4. * INSTART MENU14.RF Remote control Test3. Firmware download LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 87 Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 88 Reconnect the Normal Replace Check the Camera Ver. is “NULL”? operation? Camera module Main B/D INSTART menu Close Change the Camera module LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 89 - S/W Version HDMI/DVI, Check and fix Fix in Replace Main B/D Optical Recognition external device/cable accordance error with technical information LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 90 “Part related to nose” in the Owner’s (For models without any fix information, Manual. provide the description) LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 91 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 rights reserved. Only for training and service purposes...
Page 92 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5 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 rights reserved. Only for training and service purposes...
Page 93 Remote control operation checking method D. Function error Motion Remote operation checking method Wifi operation checking method LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 94 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 rights reserved. Only for training and service purposes...
Page 95 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. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 96: 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 rights reserved. Only for training and service purposes...
Page 97 <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 rights reserved. Only for training and service purposes...
Page 98 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 rights reserved. Only for training and service purposes...
Page 99 TV 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 rights reserved. Only for training and service purposes...
Page 100 Check Link Cable(VX1) 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 rights reserved. Only for training and service purposes...
Page 101 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 rights reserved. Only for training and service purposes...
Page 102 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 rights reserved. Only for training and service purposes...
Page 103 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 rights reserved. Only for training and service purposes...
Page 104 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 rights reserved. Only for training and service purposes...
Page 105 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 rights reserved. Only for training and service purposes...
Page 106 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 rights reserved. Only for training and service purposes...
Page 107 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 rights reserved. Only for training and service purposes...
Page 108 B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 3.5V date <ALL MODELS> Check the DC 24V, 12V, 3.5V. LGE Internal Use Only Copyright © 2015 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 109: 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 rights reserved. Only for training and service purposes...
Page 110: Checking Method
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 rights reserved. Only for training and service purposes...
Page 111 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 rights reserved. Only for training and service purposes...
Page 112 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 rights reserved. Only for training and service purposes...
Page 113 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 rights reserved. Only for training and service purposes...

This manual is also suitable for:

55ug870y 55ug870t-ta 55ug870y-ta

LG 55UG870T Service Manual

Quick Links

Need help?

Questions and answers

Summary of Contents for LG 55UG870T

Page 3: Safety Precautions

Page 4: Servicing Precautions

Page 6: Specification

Page 9: Hdmi Input

Page 13: Adjustment Instruction

Page 15: Manual Adjustment

Page 18: White Balance Adjustment

Page 23: Block Diagram

Page 34: Exploded View

Page 69: Troubleshooting Guide

Page 81: Power Error

Page 85: Function Error

Page 96: Channel Tuning

Page 109: Entry Method

Page 110: Checking Method

This manual is also suitable for:

LG 55UG870T Service Manual

Quick Links

Need help?

Questions and answers

Related Manuals for LG 55UG870T

Summary of Contents for LG 55UG870T

This manual is also suitable for:

Table of Contents