LG 86QNED99TPB Service Manual
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LG 86QNED99TPB Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UB14Y
MODEL : 86QNED99TPB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71808634 (2106-REV00)
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
Copyright © 2021 LG Electronics Inc. All rights reserved. Only training and service purposes.
86QNED99TPZ

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Summary of Contents for LG 86QNED99TPB

  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
  • Page 2 SOFTWARE UPDATE ................16 BLOCK DIAGRAM ................. 18 EXPLODED VIEW .................. 20 ASSEMBLY / DISASSEMBLY GUIDE ........... 22 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Safety Precautions

    When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics Inc. All rights reserved. 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. Only for training and service purposes.

  • Page 6: Specification

    USB Input My Media(Movie/Photo/Music List) or SVC SPDIF out (1EA) Optical Audio out Ethernet Connect AV Input CVBS, Audio LR Only for INDIA - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 8K Model Only. 7680*4320 1188 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 UHD DeepColor is On (UHD, 8K 120Hz models only), 2560*1440 182.99 119.99 497.7 Support only when UHD Deep- Color is On - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 11 General LED Mini LED General LED Mini LED Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 12 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 13 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 16 (6) After finishing the update, it will show a pop-up below the picture. (7) Click “Yes” : Tv will be turn off and on itself - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 “The latest version of the SW is available for your TV. Do you want to update now” (3) [Yes] : update starts. [No] : Close the pop-up, check out later - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: Block Diagram

    BLOCK DIAGRAM 1. E60 - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 2. F20 - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 20: Exploded View

    It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 EXPLODED VIEW (CABLE) - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 - Lay down on the work table. (one hand should hold the lower - Place your hand at 1/3 of the bottom of the module third of the module) When workers move and handle. - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 1) Place your hand at 1/3 of the bottom of the Set When workers move and handle 2) Lay down on the work table (one hand should grap the lower third of the module) - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 (3) Remove the bracket by pressing the side of the power cord bracket, pulling the power cord line upwards, and then pressing the side of the code to remove the power cord. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 (7) Disassemble the latch using Plastic scraper to remove the upper latch 6EA. (outside → inside) Top(Left) Top(Right) Plastic scraper Plastic scraper Plastic scraper Plastic scraper - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 Latch : 12EA (3) Connect the power cord and combine the power cord bracket from the left. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 (4) Assemble B/C Screw. Screw : 23ea - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 28: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 ☞A9 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 1. Reconnection 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 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External HDMI device and device/Cable Replace Main/T-con B/D error cable normal Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Replace (Check normal operation of HDMI/ Screen Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 35: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check Power ST-BY 7.8V voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 Normal Replace Main B/D Check Power B/D voltage? voltage ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Power off by panel noise wash function complited. (OLED) POWER_OFF_BY_FAN_ Power off by FAN operation status. CTRL_ERROR POWER_OFF_BY_TEMPER Power off by Temperature Sensor operation status ATURE_SENSOR_ERROR Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Screen normal of Power Board voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 (In case of Connect and check External Input Normal other external signal error) audio? device Check and fix external device Check and fix external device Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 40: Function Error

    Replace Main B/D (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 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 Down load the Firmware * If you conduct the loop at 3times, change the MR21. * INSTART MENU  14.RF Remote control Test  3. Firmware download Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Main B/D INSTART menu is “NG”? ☞A15 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in Recognition external device/cable accordance error with technical information Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Cable Make the Connect network function ‘on’ Close Close Change Voice Cable Connection Recognition Change Main B/D Is OK? Ass’y Close Re-connect Close Cable Close Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 “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) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Exchange Module (1) ~ (3) A-6/11 ~ 8/11 Module Exchange T-Con (1) ~ (2) A-9/11 ~ 10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Magic Remote/WiFi operation checking method How to use the Service remote control A16-A18 Check items after Main B/D replacement E. Etc Adjustment Test pattern - ADJ Key Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Content Check Back Light On with naked eye date If the Black light LED assemble is ‘OK’, you can see the lights on each points. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 2. Enter into White Balance. 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51  All settings  Programmes Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 Revised Content Version checking method date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 Appendix : Exchange Power Board (PSU) #11 Check parts by symptom No Light No picture/Sound Ok A - 11/11 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 68 5. LED voltage Check : P204 (VLED pin) P201 - 65V (58.5V~78.0V) P202 - 7.8A (0A~7.8A) EAY65898121(Master) P601 SK100 (AC input) All condition meets, Power Board OK. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 69 LED blank 7 times Local data error (Checksum & Data Length) Slim Direct V-sync signal error LED blank 8 times V-sync signal is low Slim Direct Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 71: 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 72 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 73 2. Check the standby 3.5V on the terminal. (③) 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. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 74 Checking order to check motion remote/wifi F20_PWM_OUT Checking order +13V_FAN 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the 3.5V on the terminal 1 pin. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 75 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 76 Digital EYE function ON/OFF For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 77 Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 78 - Record the R, G, B (GAIN, Cut) value of the color temperature before main board replacement. After replacing the main board, key in the recorded value. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 79 You can view 11 types of patterns using the ADJ Key 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!) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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