LG 50UM7300AUE Service Manual
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LG 50UM7300AUE Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA93Y
MODEL : 50UM7300/7310PUA
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71442710 (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.
50UM7300AUE
CONFIDENTIAL

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Renato moreira
February 11, 2025

Tenho uma tv lg 50um7500psb...foi trocado a placa fonte mas a tv nai liga nada ...

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1 comments:
Mr. Anderson
February 12, 2025

The LG 50UM7300AUE TV may not turn on after replacing the power supply board due to several possible issues:

1. Power Input Voltage Check - Ensure that the AC input voltage (100~240V AC) is correctly supplied to the power board at connector SK100.

2. Standby Voltage (ST-BY 7.8V) Check - Verify that the standby voltage is present. If missing, the power board may still be defective or not properly connected.

3. PWR-ON Signal Check - Measure the PWR-ON voltage at P801:
- If the TV is on, it should be above 3V.
- If the TV is in standby mode, it should be 0V.

4. 13.2V DC Output Check - At D201 center pin:
- If the TV is on, it should read 13.2V.
- If in standby, it should read 7.8V.

5. Main Board Communication Issues - If the power board is functioning correctly but the TV still does not turn on, the main board may not be sending the correct power-on signal due to:
- No I2C response from CPU (causing shutdown after 15 seconds).
- Abnormal CPU operation or reset failure.
- Main SoC command preventing power-on.

6. Power Detect Failure - If the power board detects unstable AC power, it may shut down automatically. Ensure stable AC voltage and recheck connections.

7. Defective Replacement Power Board - If all checks pass but the issue persists, the replacement power board might be faulty.

If the issue remains unresolved after these checks, replacing the main board may be necessary.

This answer is automatically generated

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Summary of Contents for LG 50UM7300AUE

  • 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 ................. 12 EXPLODED VIEW .................. 13 DISASSEMBLY ..................14 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

    AV and DVI use same jack ; SPDIF out(1EA) Optical Audio out Rear (1EA), HeadPhone HeadPhone out USB Input EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 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 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 4096*2160 53.95 23.98 296.7 UDTV 2160P 4096*2160 UDTV 2160P 4096*2160 56.25 UDTV 2160P 4096*2160 61.43 29.97 296.7 UDTV 2160P 4096*2160 67.5 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Component Input

    HDTV 1080I 1920*1080 33.75 74.25 HDTV 1080I 1920*1080 56.25 148.5 HDTV 1080P 1920*1080 67.43 59.94 148.5 HDTV 1080P 1920*1080 67.5 148.5 HDTV 1080P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Software Update

    (7) Click [Yes] : TV will be DC OFF -> ON (8) After TV turned on, Check the updated SW Version and Tool Option - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 [CLOSE] : Close the pop-up (4) If you want to cancel update, click (1.1) CANCEL UPDATE (5) [NO] : Keep updating [Yes] : Cancel updating - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: Block Diagram

    BLOCK DIAGRAM 1. Main IC - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 DISASSEMBLY GUIDE (SET) “A” P801 P201 P1000 P5800 P4000 “B” “C” - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 P7600 “D” - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 “E” - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 (Step 4) Case Top Screw disassemble (back side screw) and Case Top disassemble Top/Side down * top 5ea / side L 5ea / side R 6ea / down(side) 7ea - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 (Step 7) Optical Sheet disassemble (DS, Prism middle, Prism down, DP) (Step 8) DPS, LED Fixer disassemble & Reflector Sheet disassemble * rotate DPS (6ea) * push LED fixer in back (4ea) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 * Required LED Array Quantity Inch Q'ty 3 ea 4 ea 4 ea 5 ea 5 ea * Finish the Attached LED Array (4ea) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 21: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 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 23 ☞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 24 ☞A18 Check various Check and No Video/ voltages of Power Normal replace No audio Board (13.2V…) voltage? MAIN B/D Replace Power Board and repair parts Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 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 26 /Cable device and error normal cable Request repair for external device/cable Check external External device device and Replace Main/T-con B/D HDMI /Cable cable error normal Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 Replace screen? Screen (Check normal operation of Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 Replace Main B/D Normal? Abnormal Check for all 2- phase Replace Power B/D power out Abnormal Fix A/C cord & Outlet and check each 2 phase out Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 31 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 (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 33 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 34 Replace MR19 Close Down load the Firmware * If you conduct the loop at 3times, change the MR19. * INSTART MENU14.RF Remocon Test3. Firmware download Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 INSTART menu Voltage? 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value is “NG”? Close Change the Wifi assy Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Exchange Module (1) ~ (3) Inverter/ Module A-8/11 A-9/11 ~ Exchange T-Con (1) ~ (2) A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Check items after Main B/D replacement E. Etc Adjustment Test pattern – ADJ Key How to use JIG (Power B/D Diganostic Smart Jig Multi Gender Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 Check LCD back light with naked eye Content date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2019 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 TUNER input signal strength checking method Content date <ALL MODELS>  Advanced Channels Channel Tuning Manual Tuning 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 44 Version checking method Content date <ALL MODELS> 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 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Revised Content connection diagram (1) date <ALL MODELS> 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 47 A. Video error_Color error symptom date Revised Content Check Link Cable(EPI) reconnection condition date 43/49/55/65UM73 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 48 A. Video error_Color error symptom date Revised Content Check Link Cable(EPI) reconnection condition date 50UM73 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 49 A. Video error_Color error symptom date Revised Content Check Link Cable(EPI) reconnection condition date 70UM73 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 50 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 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 - 3/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 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 - 5/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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 62 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) 114 V 139 V SK100 (AC input) all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 63 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) 100.8V 123.2V SK100 (AC input) all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) SK100 (AC input) 152 V 185 V all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 5. LED voltage Check : P801, Pin 1-7 Picture Condition : VIVID (Back light 100) SK100 (AC input) 273.6V 334.4V all condition meets, Power Board OK. Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 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 2.Check the standby 3.5V on the terminal 16 pin (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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 69 Checking order to check motion remote/wifi KEY1_JACK Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 22 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 70 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 71 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 72 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 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 You can view 6 types of patterns using the ADJ Key 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 75 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 76: 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 77 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 78 ▶ 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 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 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 80 ▶ 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 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. ▶ 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 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 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 ▶ 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 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 ▶ 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 88 ▶ 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 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 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 91 ▶ 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 92 ▶ 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 93 ▶ 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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