LG 55UT672M0UC Service Manual
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LG 55UT672M0UC Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA9BW
MODEL : 55UT672M0UC
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71663906 (1908-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.
CONFIDENTIAL

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  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................11 BLOCK DIAGRAM ................. 13 EXPLODED VIEW .................. 14 DISASSEMBLY GUIDE................16 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

    Rear TV-LINK CFG Configuration b_LAN Tuner Rear Remote Jack Pack Rear Speaker Out(Line Out) Rear Rear Service Only PTC / CPU Debugging Rear - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 One Key(Power On/Off), 5 Keys(Power On/Off, CH Up, CH Down, Volume Up, Volume Down) Set Installation Wall Mount / Desk top WIFI/BT Combo - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 UDTV 2160P 4096*2160 67.50 30.00 UDTV 2160P 4096*2160 112.50 50.00 UDTV 2160P 4096*2160 134.86 59.94 UDTV 2160P 4096*2160 135.00 60.00 UDTV 2160P 7680*4320 1188 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9 UDTV 2160p 4096*2160 67.50 30.00 UDTV 2160p 4096*2160 112.50 50.00 UDTV 2160p 4096*2160 134.86 59.94 593.4 UDTV 2160p 4096*2160 135.00 60.00 UDTV 2160p - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: 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 - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: User Mode

    * If the software version on the USB device is equal to or lower than the version currently installed on the TV, it cannot be updated in User Mode (4) TV is updating. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 - The target files should be located in “LG_DTV” folder. (* Clone files should be copied to the root folder of the USB ) - The downloadable items differ depending upon model. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 13: Block Diagram

    BLOCK DIAGRAM - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 14: 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. - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 2. Insert the finger of the back cover bottom section triangle hole and disassemble it * Do not wear items that may damage the appearance of the product * SCREW TORQUE : 5 ~ 7Kgf.cm - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 (Step 5) Disassemble the Case Top Screw (side screw) and Case Top. * Screw down 7 EA * Hook top 6ea / side L 5 EA / side R 5 EA - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 (Step 9) Disassemble the DPS, LED Fixer & Reflector Sheet * Rotate the DPS to remove (9 EA) * Push LED fixer in back (4 EA) - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 2) Press the LED Array on the surface of Cover Bottom. 3) Connect the CNT to the LED Array. * Finish the Attached LED Array (4 EA) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 20: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Main PCB Main processor DDR Memory Audio AMP Power from PSU PANEL IR Ass’y Audio <SIZE: 270x174> Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Interconnection Main PCB PANEL FFC Cable Local Key+IR ASSY SPEAKER Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Circuit noise, mechanical noise F. Exterior error Exterior defect G.Commercial Feature IR OUT 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 24 ☞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 25 ☞A18 Check and Check voltage of No Video/ Normal replace Power Board ( 13V…) No audio 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 26 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 27 Comp/AV/RGB normal error 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 28 Replace screen? Screen (Check normal operation of Main /T-con External Input, Comp/AV, 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 29 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 30 "POWEROFF_UNKNOWN" Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 13V 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 - Fix information information? signal Recognition error - S/W Version HDMI/ Check and fix 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 35 “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 36 Revised date 13/14 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 37 IR OUT Check Suitable Check Same Not working Replace MAIN Board RS-232 Connection Remote Controller Data Format as Guide data Format Change Remote Change cable Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5 Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Voltage and speaker checking method when there is no audio Remote control operation checking D. Function error method IR OUT G. Commercial - Cable connection - Recommended data format Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Content date <ALL MODELS> 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 41 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. (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 42 TUNER input signal strength checking method Content date <ALL MODELS> Menu/Setting  Channel  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 43 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 44 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 45 Content Connection diagram (1) date * Interface Jack depends on model 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 46 Revised Content Check Link Cable(FFC) reconnection condition date <ALL MODELS> 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 47 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 48 Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack A - 1/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION A - 2/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk A - 4/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect A - 5/5 Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check front Power Indicator date <ALL MODELS> Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Check power input voltage and ST-BY 3.5V Content date Check the DC 13V Copyright © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2019 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 1. Press the Setting/Menu button on the remote control 2. Select the Audio 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 57 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 58 2.Check the standby 3.5V 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.

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