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LG OLED55BXPUA Service Manual
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LG OLED55BXPUA Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EAX2B
MODEL : OLED55/65BXPUA
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71717401 (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.
OLED55/65BXAUA

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Summary of Contents for LG OLED55BXPUA

  • 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 ........... 12 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 3 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 - 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 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 (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 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 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 2. Remove screw 4ea, disassemble stand from back cover. * Push the latch, separate the stand cover to the top. Screw : 4 EA - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 4. Remove screw 4 EA, disassemble back cover from module. * Put hand on the marked area( ), separate the back cover to the top. Latch : 12ea Screw : 4 EA - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 5. Remove screw 1ea, disassemble Wifi/Jog assy. Screw : 1ea 6. Remove the latch 2ea, disassemble IR assy. Latch : 2ea Slide - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 7. Remove all sort of cable. 8. Disassemble speaker. - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 9. Remove screw 12ea, disassemble Main PCB and PSU. Screw : 12ea 10. Remove screw 7ea, disassemble stand guide and stand fixer. Screw : 7ea - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 11. Remove screw 4 EA, disassemble VESA Bracket Screw : 4ea - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 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 20 ☞A4 & A2 Always check & record S/W Version and White Balance value Replace Main B/D Re-enter White Balance value before replacing the Main Board Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Check and replace Check Power Board Normal No Video / Main B/D output to Main (20V, 12V ) No audio Voltage? Replace Power B/D or repair parts Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 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 23 Input device/Cable device and cable error normal Request repair for external device/cable External Check external HDMI Replace Main B/D device/Cable device and cable error normal Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 (Check normal operation of Screen Main B/D / External Input, Component, HDMI screen? normal? Module AV and HDMI by connecting Jig, pattern Generator ,Set- top Box etc. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Measure each output voltage of Power B/D ☞A10/A11 Normal Normal Check ST-BY (7.8V) Replace Main B/D Normal? voltage? voltage? Replace Power B/D Close Replace Power B/D Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 Normal Replace Main B/D Check Power B/D voltage? output 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 27 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 28 Power Board or not Replace Power Board or repair parts Select Internal TV Speaker Check Speaker Replace Main B/D Disconnection cable connection Connect Speaker cable Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 (In case of External Input Connect and check signal error) Normal other external Check and fix external audio? device device Check and fix external device Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 31 Download the Firmware •If you conduct the loop at 3times, Instart Memu change Magic remote control  12.RF Remote control Test  Receiver Firmware Download Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 “NG”? Voltage? Instart menu Main B/D ☞A16 Close Check & Repair Wi-Fi cable connection ☞A4 Wi-Fi MAC Close is “NG”? Replace the Wi-Fi assy Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 - Fix information information? Recognition error - S/W Version HDMI/DVI, Check and fix Replace Main B/D Optical Recognition Fix in external device/cable error accordance with technical information Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 “Part related to nose” in the Owner’s (For models without any fix information, Manual. provide the description) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Revised date 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 36 Example of Symptom (Module) A-7/10 Example of Symptom (Module) A-8/10 Example of Symptom (Module) A-9/10 Example of Symptom (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 37 Remote control operation checking method D. Function error Wi-Fi/Motion Remote operation checking method How to use the Service remote control A17-A19 E. Etc Check items after Main B/D replacement Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Check a voltage of R7624(Red) after turn on the TV. If the voltage is high, BDP issue.(NG) If the voltage is low, Vx1 is locked.(OK) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 2. Enter into ‘12.White Balance’ 3. After recording the R, G, B (Gain, Cut) value of each Color Temp(Cool/Medium/Warm), re-enter the value after replacing Main board. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 All Settings  Programmes  Programme Tuning & Settings  Manual Tuning 3. Check the signal level. 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 41 A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date Version 1. Press ‘IN START’ button on Factory Service remote control. 2. Check S/W Version Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 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 43 Residual image, Light spot date 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 44 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Screen darkness to disconnection of the FFC cable pin. G Color G color transient due to poor FFC cable Cable connection Excessive A - 1/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Vx1 cable connection problem Cable Color spread Vx1 cable connection problem Due to foreign substance withi nLVDS Cable Screen stop cable PIN A - 2/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 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 48 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 49 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 50 Source Driver issue Module White dot White dot cause by panel issue Module Line Dim Vertical Line cause by source drive IC A - 6/10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Horizon line Module has damaged Module has damaged Module Line Defect 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 52 In this case please exchange the module difference Compensation error when Power On/off Module Green light 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 53 Module has 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 54 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 55 B. Power error _No power symptom date Revised Content Check 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 56 Check 12VM line for ST-BY Voltage Power To Main B’d 55/65BX ST-BY status : 7.8V, Power on(DC On) status : 12V P201 P252 P251 Power To Module Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 POWER OFF MODE checking method date 1. Press ‘IN START’ button on Factory Service remote control 2. Check the entry into ‘3. Power On/Off Status’. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 59 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 3. AS checking the Pre-Amp of IR B/D(③) , 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 61 ① ③ ② Checking order 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the 3.5V on the terminal 1, 6. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 63 Digital EYE function ON/OFF For some Model, access to the Test Pattern Used for screen tilting change (Access to the old PDP control mode) TILT Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Connects to external input 1,2,3 AV1,2,3 (Added function) Connects to Component 1,2 COMP1,2 (Added function) HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) Connects to DVI DVI (Add function) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 - 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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