LG OLED77ZXPTA Service Manual
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LG OLED77ZXPTA Service Manual

LG OLED77ZXPTA Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EBX1Y
MODEL : OLED77ZXPTA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71696245 (2009-REV01)
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.
OLED77ZXPVA

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  • 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 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 12 ASSEMBLY / DISASSEMBLY GUIDE ............ 13 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.

  • Page 4: Servicing Precautions

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

  • Page 6: Specification

    DVB-S (QPSK) : 2 ~ 45Msymbol/s - Viterbi DVB-S mode : 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 - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Component Input

    1920*1080 33.75 60.00 74.25 HDTV 1080I 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.43 59.94 148.50 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 107.89 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 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 241.5 only when 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 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (6) Turn OFF the TV and On. Check the updated SW Version (8) After TV turned on, Check the updated SW Version and and Tool Option. Tool Option. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: 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. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 (2) stand screw 4 EA(2-Pole 2 EA + 2 EA) after Place on a flat pad. (3) Remove a AV Cover / Wall Mount Cover. Wall Mount Cover AV Cover - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 (5) Ready to open back cover after recognizing back cover latch point 20 EA. (6) The latch for Back cover assembly is separated in the order of Side → bottom → Center → Top . - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 And disassembly the latches by pushing up on the close side to the latch on the inside of the back cover. - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 * Back Cover Handling Guide - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 OLED77ZX Latch 20 Point (Push about 50mm above the hole.) (4) Tighten the Screw 12 EA(Back side 8 EA + bottom side 4 EA) - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 Wall Mount Cover AV Cover (6) Tighten screw 4 EA(2-Pole 2 EA + 2 EA). (7) Tighten the Stand Cover 2 EA. PUSH PUSH - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 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 21 ☞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 22 Check various voltages of Check and No Video/ Normal Power Board Board (Main) replace No audio voltage? (12V,20V) MAIN B/D Replace Power Board and repair parts Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 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 24 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 (Check normal operation of Replace Main HDMI/ Screen External Input, Component, normal? B/D, Module 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 26: Power Error

    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 27 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 28 Check & Change OLED Module Power off by resume fail when dc on case. POWER_OFF_BY_RESUME_FAIL Check & Change Main B/D If occur the resume fail, TV will be rebooted. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 POWER_OFF_BY_PNWASHDONE Power off by panel noise wash function completed. POWER_OFF_BY_COOLING Power off for cool down the OLED t-con. POWER_OFF_BY_EDID_WRITE Power off by EDID write done. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 31 (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 32: 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 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 34 (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 35 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 36 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 37 “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 38 Revised date 18/18 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Defected Type caused by Cable / Main Examples of Symptoms (Module) A-6~9/10 Board / Module 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 40 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 41 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 42 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 43  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 44 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 45 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 46 Revised Content Connection diagram date *OLED77ZXPTA 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 47 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 48 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 49 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 50 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 51 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 52 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 53 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 54 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 55 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 56 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 57 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 58 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 59 P202 P205 P204 Power To Module P202 P204 P205 23.5V 23.5V(EVDD) 23.5V(EVDD) ON 23.5V(EVDD) OFF 23.5V(EVDD) ON -> 21.5V 23.5V(EVDD) ON -> 21.5V 23.5V(EVDD) OFF Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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 61: 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 3. Connect the tester P20102 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 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 64 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 65 Voice Recognition operating checking method date 1. Menu > General > AI Service 2. Voice Recognition Help and Settings 4. Active ‘Use Hands-free Voice Control’ 3. Settings Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 67 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 68 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 69 - 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.

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