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LG 55UK6700PVD Service Manual
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LG 55UK6700PVD Service Manual

Chassis ub83p
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LED TV
SERVICE MANUAL
CHASSIS : UB83P
MODEL : 55UK6700PVD / YVD
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70425802 (1802-REV00)
Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
55UK6540PTD / 6900PTD
CONFIDENTIAL

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  • Page 1 CHASSIS : UB83P MODEL : 55UK6700PVD / YVD 55UK6540PTD / 6900PTD CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70425802 (1802-REV00) Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 23 DISASSEMBLY GUIDE ................25 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

    PC(HDMI Ver. 1.4), Support HDCP Audio Input DVI Audio, Component, AV SPDIF out SPDIF out USB Input For My Media(Movie/Photo/Music List) or For SVC Ethernet Connect(1EA) Ethernet Connect - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Cvbs Input

    1920*1080 33.75 60.00 74.25 HDTV 1080I 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.43 59.94 148.50 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 30.00 UDTV 2160P 4096*2160 112.5 50.00 UDTV 2160P When HDMI1,2,3 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON 4096*2160 60.00 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 3840*2160 67.5 30.00 297.00 UDTV 2160P UHD model only 4096*2160 53.95 23.97 296.703 UDTV 2160P UHD model only 4096*2160 UDTV 2160P UHD model only - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (7) Click [Yes] : TV will be DC OFF → ON. and Tool Option. (8) After TV turned 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. EXTERNAL - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 2. EPI / CDES - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 3. Vx1 - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 4. TUNER LNB_TX - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 5. VIDEO & AUDIO IN/OUT - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 6. HDMI 2.0 - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 7. USB / Wi-Fi / M-Remote / UART(Debug) - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 8. I2C Map - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 9. GPIO(LM18A) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 10 GPIO(MICOM - ABOV) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 11. POWER 1 - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 10. POWER 2 - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 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. - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 25: Disassembly Guide

    DISASSEMBLY GUIDE 1. Unlock screw("1": 12 EA, "2": 6 EA) to separate back cover assembly from module. 2. Detach cable and tape. - 25 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 3. Unlock screw("3": 4 EA) to separate Back cover bottom assembly from module. 4. Separate connectors "5"(10 EA) from Main/Power PCB and module. Separate "6" Speaker(2 EA) from module. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 6. Unlock screw("8": 4 EA) to separate VESA Bracket, 4 EA. Unlock screw("9": 4 EA) to separate Stand supporter, 4 EA. And detach "10"(Insulation sheet). - 27 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 7. Remove cable "10" from IR assy and pull the IR assy. Pull direction 8. Remove cable "12" from Wifi assy and separate Latch "13"(2 EA). - 28 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 29: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 30 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 31 ☞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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 32 ☞A18 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (13.2V…) MAIN B/D Replace Power Board and repair parts Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 34 Replace Main/T-con B/D 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 Screen Replace (Check normal operation of Main /T-con normal? External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 36: Power Error

    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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 Check A/C cord Error? Abnormal Check for all 3- phase Abnormal Replace Power B/D power out Fix A/C cord & Outlet and check each 3 phase out Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 38 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40 (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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 41: 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 Replace MR18 Close Down load the Firmware * If you conduct the loop at 3times, change the M4. * INSTART MENU14.RF Remocon Test3. Firmware download Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 43 “NG”? Voltage? 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 44 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition accordance error with technical information Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 45 “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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 46 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 47 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 48 Check items after Main B/D replacement E. Etc Adjustment Test pattern – ADJ Key T-Con PMIC voltage measurement point How to use JIG (Power B/D Diganostic Smart Jig Multi Gender Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 49 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 50 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 52 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 53 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 54 Revised Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 55 A. Video error_Color error symptom date Revised Content Check Link Cable(EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 56 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 57 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 58 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 59 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 60 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 61 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 62 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 63 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 64 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 65 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 66 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 67 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 68 Local Dimming - UK75 D-GND D-GND ① ① Pwr_ON PDIM2 Pwr_ON PDIM2 D-GND D-GND A-GND A-GND A-GND A-GND PDIM1 Drv_ON PDIM1 SCLK SK100 (AC input) VSINC Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 69 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 70: 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 71 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 72 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 73 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 74 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 75 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 76 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 77 - 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 78 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 79 PM VCC 4.75 5.25 ⑬HVDD ④VCOM2 PMCI JIG Point ⑨VGH EVEN LS VGL -15V -14.25 -15.75 HVDD 8.23V 7.82 8.64 VDD EPI 16.8V 15.96 17.64 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 80 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 31 (1/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 81: Main Board

    UK75 24 Marking Check UK78 28Pin 28Pin 12Pin 12Pin 28Pin Cable Connection Includes 49UJ63 17Y/18Y 16/18Y 16Y/17Y 16Y/17Y/18Y (SJ/UJ/SK) (UH) (UH/UK) A31 (2/19) (UH/SJ) (LH/LJ) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 82 ‘17 OLED E7, G7 SJ95/UJ98 SJ85/UJ94 SJ80, UJ77 UJ75/UJ78 ’17 UJ65/UJ68 UJ63/UJ67 LJ61/LJ68 LJ55/LJ58 SK95/SK85 SK81/SK80 ‘18 UK78/UK75 UK63/UK64/UK65 32LK62, 43/49LK61 ‘18 OLED A31 (3/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 83 “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A31 (4/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 84 - 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 A31 (5/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 85 ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A31 (6/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 86 ▶ 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. A31 (7/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 87 ▶ 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. A31 (8/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 88 ▶ 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 A31 (9/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 89 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A31 (10/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 90 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A31 (11/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 91 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A31 (12/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 92 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A31 (13/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 93 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A31 (14/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 94 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A31 (15/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 95 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A31 (16/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 96 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board A31 (17/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 97 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A31 (18/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 98 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A31 (19/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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