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LG OLED55B9PUA Service Manual
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LG OLED55B9PUA Service Manual

LG OLED55B9PUA Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EA92B
MODEL : OLED55B9PUA
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71409504 (1903-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 © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
OLED65B9PUA
CONFIDENTIAL

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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 ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 17 DISASSEMBLY GUIDE ................18 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: Application Range

    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 SDTV, DVD 480I(525I) 720*576 15.62 13.5 SDTV, DVD 576I(625I) 50Hz 720*480 31.47 59.94 SDTV 480P 720*480 31.5 27.02 SDTV 480P 720*576 31.25 SDTV 576P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 UDTV 2160P 4096*2160 134.86 59.94 593.4 UDTV 2160P 4096*2160 UDTV 2160P 4096*2160 1188 UDTV 2160P 4096*2160 1188 UDTV 2160P 2560*1440 88.78 241.5 2560*1440 497.7 - 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 1. Main - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 2. I2C - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 3. Tuner - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 4. Video & Audio IN - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 14: Audio Out

    5. Audio OUT - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 6. HDMI CEC_REMOTE - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 7. USB / Wi-Fi / M-Remote / UART - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: 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. - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: Disassembly Guide

    2. Remove screw 4ea, disassemble stand from back cover. * Push the latch, separate the stand cover to the top. Screw : 4 EA - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 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 - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 5. Remove screw 1ea, disassemble Wifi/Jog assy. Screw : 1ea 6. Remove the latch 2ea, disassemble IR assy. Latch : 2ea Slide - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 7. Remove all sort of cable. 8. Disassemble speaker. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 9. Remove screw 12ea, disassemble Main PCB and PSU. Screw : 12ea 10. Remove screw 7ea, disassemble stand guide and stand fixer. Screw : 7ea - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 11. Remove screw 4 EA, disassemble VESA Bracket Screw : 4ea - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 24: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 ☞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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 “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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 - 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 “Part related to nose” in the Owner’s (For models without any fix information, Manual. provide the description) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Check a voltage of R7632 after turn on the TV. If the voltage is low, Vx1 is locked.(OK) If the voltage is high, BDP issue.(NG) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 P-ONLY -> HDMI HOT -> CH + or - 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 10/10 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 63 Stand-by condition : Red Power On condition : Turn Off ※ Power indicator control Menu  All Settings  General  Standby Light  ON/ Off Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 Check 12VM line for ST-BY Voltage ST-BY status : 7.8V, Power on(DC On) status : 12V Power To Main B’d P201 P251 Power To Module Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 66 Checking method in menu when there is no audio date 1. Press ‘MENU’ button. 2. Select ‘All Settings’ 3. Select ‘Sound’ menu and ‘Sound Out’. 4. Select Internal TV Speaker. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 67 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 69 +3.5V_ST KEY2 KEY1 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 70 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 71 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 72 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 73 - 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 74 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: Main Board

    24 Marking Check UK74,UK75 28Pin 28Pin 12Pin 12Pin 28Pin UK77,UK78 Cable Connection SK79 Includes 49UJ63 SM80/SM86 16/18Y/19Y 17Y/18Y 16Y/17Y 16Y/17Y/18Y/19Y (UH) (UH/SJ) (SJ/UJ/UK/SK) (UH/UK/UM (LH/LJ/LK/LM) Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 76 UJ65/UJ68, UJ63/UJ67 LJ61/LJ68, LJ55/LJ58 SK80/SK85/SK95 UK78/UK75/UK77/SK79 ‘18 UK63/UK64/UK65/UK68/UK7050 LK57, 32/43/49LK54, 32LK61/62, 43/49LK61 ‘18 OLED B8, C8, E8, G8, W8 SM80/SM85/SM86 ‘19 UM73/UM74/UM75/UM76/UM79/UM80 LM57/LM63 ‘19 OLED B9/C9/E9/W9 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 77 ▶ Power Board Muitl Gender JIG “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 78 - 20V Power Board : Change the switch to 24V of Smart Jig Voltage - 13.2V/18V Power Board : Change the switch to 24V of Smart Jig Voltage Power B/D Smart Jig Voltage Switch 13.2V/18V Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 79 ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 80 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 81 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 82 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 83 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 84 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 85 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 86 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 87 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 88 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 89 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 90 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 91 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 92 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board can be judged as defective. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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