LG 49UJ7700 Service Manual
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LG 49UJ7700 Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA71P
MODEL : 49UJ7700
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69823928 (1702-REV01)
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 © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
49UJ7700-UA

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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 .................. 21 DISASSEMBLY GUIDE ................23 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: Specification

    Optical Audio out Rear (1EA), USB Input(3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD Side(1EA), Rear(2EA) Side(1EA), Rear(1EA) for UJ65, UJ63 - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 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 23.97 296.70 UDTV 2160P 4096*2160 UDTV 2160P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 296.70 UDTV 2160P 4096*2160 67.5 30.00 UDTV 2160P 4096*2160 112.5 50.00 UDTV 2160P 4096*2160 134.86 59.94 593.40 UDTV 2160P 4096*2160 60.00 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Software Update

    (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 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Block Diagram

    Block Diagram 1. Main SoC - 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. Power - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 4. Tuner - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 5. Video/Audio - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 6. I2C Map AMP_MUTE SIDE_HP_MUTE - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 7. EPI block (PMIC) CEC_REMOTE - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 8. USB / WIFI / M-REMOTE / UART - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 9. EPI 60Pin Interface (60Hz/3Gbps) - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 10. CEDS 68Pin Interface (60Hz/1.5Gbps) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 11. V x 1 51Pin Interface (60Hz/2.97Gbs) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 21: 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. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 23: Disassembly Guide

    Total Screw No.: 31ea 1. After Screw Disassemble, please remove B/C from Module Screw : 15 ea [Fig.1] 2. Detach Tape Detach tape [Fig.2] - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 4. IR assy, WiFi PCB assy disassembly Disassemble screw (1ea) and Remove wi-f i cable Remove IR cable and Disassemble Latch (1ea) [Fig. 4] - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 25: Speaker Disassembly

    5. Screw disassembly Screw : 11 ea [Fig.6] 6. Speaker disassembly [Fig.7] - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 8. Screw disassembly Screw : 4ea [Fig.8] - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 27: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2017 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 © 2017 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 ☞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 © 2017 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 32 /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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 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 © 2017 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 © 2017 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 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 © 2017 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Replace MR13 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 INSTART menu 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 4.Camera operating error ☞A4 ☞A25 Check the Camera Ver. Reconnect the Normal Replace is “NULL”? INSTART menu operation? Camera module Main B/D Close Change the Camera module Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 “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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Content date <60”65”> <43”49”55”> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Revised Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Revised Content Check Link Cable(VX1/EPI) reconnection condition date <60”65”> <43”49”55”> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 57 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 63 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 67 Values Backlight Symbol Unit Check the DC 13.2V. Forward Voltage 90.09 100.1 110.11 101.61 112.0 124.19 106.38 118.2 130.2 122.76 136.4 150.04 128.34 142.6 156.86 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 69 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 70 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 71 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 72 Checking order to check motion remote/wifi KEY1 Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 22 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 73 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 74 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 75 Connects to external input 1,2,3 COMP1,2 (Added Connects to Component 1,2 function) HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 76 - 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 77 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 78 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 29 (1/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 79 24Pin 28Pin (OLED) 24Pin 28Pin 16Y/17Y (UH/UJ) 18Pin 28Pin 28Pin 12Pin 12Pin 28Pin Includes 49UJ63 16Y/17Y 16Y/17Y (SJ/UJ) (UH) A 29 (2/19) (UH) (UH/SJ) (LH/LJ) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 80 OLED ‘16 UH95/UH96 UH85/UH93 UH77/UH87 UH75/UH76 UH65/UH68 LH68, LH66, LH60,LH54 ‘17 OLED SJ95/UJ98 SJ85/UJ94 SJ80, UJ77 UJ75/UJ78 ’17 UJ65/UJ68 UJ63/UJ67 LJ61/LJ68 LJ55/LJ58 A 29 (3/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 81 “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A 29 (4/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 82 - 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 A 29 (5/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 83 ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A 29 (6/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 84 ▶ 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. A 29 (7/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 85 ▶ 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. A 29 (8/19) Copyright © 2017 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. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A 29 (9/19) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 87 Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A 29 (10/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 88 Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A 29 (11/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 89 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A 29 (12/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 90 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A 29 (13/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 91 Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A 29 (14/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 92 Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A 29 (15/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 93 Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A 29 (16/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 94 Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board A 29 (17/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 95 Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A 29 (18/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 96 Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A 29 (19/19) can be judged as defective. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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