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LG OLED55B9PTA Service Manual
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LG OLED55B9PTA Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EB91E
MODEL : OLED55B9PTA / PVA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70442905 (1903-REV00)
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
OLED65B9PTA / PVA
CONFIDENTIAL

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Summary of Contents for LG OLED55B9PTA

  • Page 1 CHASSIS : EB91E MODEL : OLED55B9PTA / PVA OLED65B9PTA / PVA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70442905 (1903-REV00) Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 20 DISASSEMBLY GUIDE................21 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 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 UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 135.00 60.00 UDTV 2160P UHD DEEP COLOUR ON - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 297.00 UDTV 2160P 3840*2160 56.25 25.00 297.00 UDTV 2160P 3840*2160 67.5 30.00 297.00 UDTV 2160P 4096*2160 53.95 23.97 296.703 UDTV 2160P 4096*2160 UDTV 2160P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (8) After TV turned on, Check the updated SW Version and Tool Option (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM 1. MAIN - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 2. I2C - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 3. POWER - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 4. TUNER - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 5. VIDEO / AUDIO IN - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 6. AUDIO OUT AMP_MUTE SIDE_HP_MUTE - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 7. HDMI CEC_REMOTE - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 8. USB / Wi-Fi / M-Remote / UART - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 9. EPI 68Pin Interface - 19 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.
  • Page 21 Total Screw No. : 33 EA 1. Disassemble stand cover from back cover. * Push the latch, separate the stand cover to the top. Latch : 2 EA - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 2. Remove screw 4 EA, disassemble stand from back cover. Screw : 4 EA 3. Remove screw 1 EA, disassemble power cord from back cover. Screw : 1 EA - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 ), separate the back cover to the top. Screw : 4 EA, Latch : 12 EA 5. Remove screw 1 EA, disassemble Wifi/Jog assy. Screw : 1 EA - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 6. Remove the latch 2 EA, disassemble IR assy. Latch : 2 EA Slide 7. Remove all sort of cable. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 8. Disassemble speaker. 9. Remove screw 12 EA, disassemble Main PCB and PSU. Screw : 12 EA - 25 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 10. Remove screw 7 EA, disassemble stand guide and stand fixer. Screw : 7 EA 11. Remove screw 4 EA, disassemble VESA Bracket Screw : 4 EA - 26 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 27: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 28 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 29 ☞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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 30 Check various voltages Check and Normal No Video/ of Power Board (Main) replace voltage? (20V, 12V…) No audio MAIN B/D Replace Power Board and repair parts Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 31 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 32 Replace Main B/D error cable normal Request repair for external device/cable Check external External HDMI device and device/Cable Replace Main B/D error cable normal Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 (Check normal operation of HDMI/ Screen screen? Main B/D / External Input, Component, normal? RGB and HDMI/DVI by Module connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 34: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY (7.8V) voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 36 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection connecting Speaker Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 38 (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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 39: 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40 Replace MR19 Close Down load the Firmware * INSTART MENU12.RF •If you conduct the loop at 3times, Remocon Test Receiver change the MR19. Firmware download Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 “NG”? Voltage? 1pin Main B/D ☞A14 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 Recognition error signal - 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 43 “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 44 Revised date 16/16 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 45 Exchange Main Board (2) A-2/5 <Appendix> Exchange Power Board (PSU) A-3/5 Defected Type caused by T-Con/ Power / Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 46 Wifi operation checking method How to use the Service remote control A15-A17 Check items after Main B/D replacement E. Etc Adjustment Test pattern Update Download Guide Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 47 Check Vx1 lock Content date R7624 : 0[V] Check a voltage of R7624 after turn on the TV. If the voltage is low, Vx1 is locked.(OK) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 48 2. Enter into White Balance of item 12. 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 49 All Settings  Programmes  Programme Tuning & setting When the signal is strong, use the  Manual Tuning  Antenna DTV attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 50 OLED TV 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 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 52 Revised Content OLED TV 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 53 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 54 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 55 LVDS cable connection problem CABLE Color spread LVDS 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 56 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 57 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 58 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 59 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 60 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 61 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 62 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 63 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 64 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 65 Content date Check the DC 12VT line for ST-BY Voltage Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P201 P251 Power To Module Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 66 Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 (Power On/Off Status) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 67: 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 68 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 69 3.5V_WiIFI 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 70 Checking order to check motion remote/wifi SUME_JACK WIFI_DM Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 3.5V_WiIFI 2.Check the 3.5V on the terminal 19 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 71 Standard Repair Process Detail Technical Manual Error Established D. Function error 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 72 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 73 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 74 - 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 75 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A19 (1/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 76: Main Board

    24 Marking Check UK74,UK75,UK77,UK78 28Pin 28Pin 12Pin 12Pin 28Pin SK79 Cable Connection SM80/SM81/SM86 Includes 49UJ63 16/18Y/19Y 16Y/17Y 17Y/18Y 16Y/17Y/18Y/19Y (UH) (UH/SJ) (SJ/UJ/UK/SK) (UH/UK/UM A19(2/19) (LH/LJ/LK/LM) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 77 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/SM81/SM85/SM86/SM90/SM95/SM98 ‘19 UM71/UM73/UM74/UM75/UM76/UM79/UM80 LM57/LM63 ‘19 OLED B9/C9/E9/W9 A19 (3/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 78 “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A19 (4/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 79 - 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 A19 (5/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 80 ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A19 (6/19) 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. A19 (7/19) 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. ▶ When the NG LED turns on, the Power Board can be judged as defective. A19 (8/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 83 ▶ 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 A19 (9/19) 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 A19 (10/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 85 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A19 (11/19) 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) A19 (12/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 87 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A19 (13/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 88 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A19 (14/19) 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 A19 (15/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 90 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A19 (16/19) 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 12Pin connector ▶ When the NG LED turns on, the Power Board A19 (17/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 92 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A19 (18/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 93 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A19 (19/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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