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LG OLED88ZXPUA Service Manual
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LG OLED88ZXPUA Service Manual

Chassis : eax1z
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OLED TV
SERVICE MANUAL
CHASSIS : EAX1Z
MODEL : OLED88ZXPUA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71717001 (2003-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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG OLED88ZXPUA

  • 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 ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 11 ASSEMBLY / DISASSEMBLY GUIDE ........... 13 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

    Optical Audio out Rear(1EA) HeadPhone(1EA) HeadPhone out Rear(1EA) USB Input(3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD Ethernet Connect (1EA) Ethernet Connect - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 31.5 27.02 SDTV 480P 720*576 31.25 SDTV 576P 1280*720 44.96 59.94 74.17 HDTV 720P 1280*720 74.25 HDTV 720P 1280*720 37.5 74.25 HDTV 720P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 8K Model Only. 7680*4320 1188 8K Model Only. 7680*4320 2376 8K Model Only. 7680*4320 263.74 59.94 2376 8K Model Only. 7680*4320 2376 8K Model Only. - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Software Update

    (5) After finished the update, below Pop-up appear (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: 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. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 EXPLODED VIEW(CABLE) - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 When moving the set, do not hold the head part (red dotted line part) by hand, move it by holding the stand (green line part). When moving the set, Handling by more than 4 persons. * Refer to the picture below. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 (1-3) Unscrew Screw(A) 1EA for DC Cable Fixer, and disconnect the DC Cable. Stand Cable Cover Stand Cable Cover DC Cable Fixer DC Cable - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 * The Sound Reflector is attached to the stand only by a magnet. Thus, Make sure that the Sound Reflector does not fall off to the floor when it is removed. Sound Reflector Sound Reflector - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 (4-1) Lift the Head part and separate it from the Stand. The Shaft is fully released status. (※ The Shaft is not separated from the Stand) - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 (5-2) Separate the Back Cover by lifting the bottom of the Back Cover. (Carefully separate the upper holder joints.) Back Cover inner holder joints - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 (5-3) Back Cover disassembly completed. - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 (6-2) Separate the Cable Fixer, Pass the DC Cable through the holes, and pull down. Stand Cable Cover Stand Cable Cover Cable Fixer - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 (7-2) Separate the Power Box from Stand by pulling the DC Cable and the Power Code Cable. * Pull out gently while pulling the left and right simultaneously to avoid damage or missing the cable. Power Box - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Make sure that the Guide Pem-nut on the Power Box is inserted into the Stand inner Guide Rail. For normal assembly, the left and right sides must be inserted to the end at the same time. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 (8-1) Unscrew Screw(F) 12EA on top of Power Box and separate Power Box Top Cover. Power Box Top cover - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 [Assembly Guide] (1-1) Cover the Power Box Top Cover and Screw the Screw(F) 12EA. Power Box Top cover - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 * For normal assembly, the left and right sides must be inserted to the end at the same time. (2-2) Screw the Power Box Fixation Screw(E) 3EA on the back of the Stand. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Tighten the cable fixer. (3-2) Tighten the Stand Cable Cover. (Vertical direction 1EA, Horizontal direction 1EA) Cable Fixer Stand Cable Cover Stand Cable Cover - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 * When pressing the Latch part, Make sure that you hear a ‘Tap' sound and make a normal connection. (4-2) Screw the Back Cover Fixation Screw(D) 9EA. Back Cover inner holder joints - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Head. ※ T h e head of th e shaft does n ot protrude fr om th e stand surface. - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 ※Check the DC Cable before assemble Reflector to Stand. Cable does not protrude Cable protrudes to the outside (NG) to the outside (OK) Sound Reflector - 28 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 (7-3) Assemble the Main Cover and the Power Cover. Matching color of Cable and Label DC Cable Fixer Fixing Cable Cable Fixer Stand Cable Cover Stand Cable Cover - 29 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 ☞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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 Check various voltages of Check and No Video/ Power Board Board (Main) Normal replace No audio (12V,20V) voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Replace Main/T-con B/D Component device/Cable cable error normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 (Check normal operation of Replace Main HDMI/ Screen External Input, Component, B/D, Module normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Measure each output voltage 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Reboot by SW down load function UNKNOWN No meaning (same as initial value) COMP_END OLED threshold voltage degradation(Compensation) completes. PNWASHDONE Power off by panel noise wash function complited. (OLED) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Screen normal voltage or not Power Board Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Replace Main B/D (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 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Download the Firmware • If you conduct the loop at 3times, change the Magic remote control. Instart Menu → 12.RF Remote control Test → Receiver Firmware Download Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 (3.5V) Voltage? Instart menu Main B/D ☞A14 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Replace the Wifi assy Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Recognitionerror - S/W Version HDMI/ Check and fix DVI, Optical Fix in Replace Main B/D Recognition external device/cable accordance error with technical information Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 “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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Defected Type caused by Cable / Main Board / Module Examples of Symptoms (Module) A-6~9/10 Examples of Symptoms (Power Board) A-10/10 Continue to the next page Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Wifi/Motion remote operation checking method Voice Recognition operation checking method How to use the Service remote control A16~18 E. Etc Check items after Main B/D replacement Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Revised Content Check Vx1 Lock date Check a voltage of R30325 when TV is on. Vx1 is OK if the voltage is 0V(Low). Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 All settings  Programmes  Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Revised Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1/EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 VX1 cable connection problem CABLE Color spread VX1 cable connection problem Due to foreign substance withi nVx1 CABLE Screen stop cable PIN A - 2/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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 - 3/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 61 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 - 5/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 63 Source-driver issue MODULE Image broken White dot cause by panel issue MODULE White dot MODULE Line dim Vertical line cause by source-driver IC A - 6/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Horizontal line Module is damaged MODULE Line defect Module is damaged Un-repairable cases MODULE Press damage In this case please exchange the module A - 7/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 In this case please exchange the module difference MODULE Green light Compensation error when power on/off Color difference between screen cause MODULE Color difference by compensation error A - 8/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 66 Module is damaged MODULE No image (Can’t fix it) Burnt MODULE Burnt (Can’t fix it) Screen Mura MODULE Mura (Can’t fix it) A - 9/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 67 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 10/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 69 B. Power error _No power symptom date Revised Check power input voltage and ST-BY 7.8V Content date Check a voltage of DC 12VM (ST-BY : 7.8V, Normal : 12V) Copyright © 2020 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 71 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 72 3.Connect the tester P20102 to the speaker terminal and if you hear the ‘Chik~ Chik~’ SPK_L-_TW sound when you touch the GND and output terminal, the speaker is normal. SPK_L+_TW Copyright © 2020 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 74 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_WIFI on the terminal 13, 19, 24 Pin Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 75 Voice Recognition operating checking method date 1. Menu > General > AI Service 2. Voice Recognition Help and Settings 3. Settings 4. Active ‘Use Hands-free Voice Control’ Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 76 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 77 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 78 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 79 - 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.