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LG 75UH5J-MP Service Manual
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LG 75UH5J-MP Service Manual

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LG Digital Signage
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71897265 (2305-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 © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
UWA7B
75UH5J
75UH5J-MP

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Summary of Contents for LG 75UH5J-MP

  • 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 SERVICING PRECAUTIONS ..............5 SPECIFICATION ..................7 SOFTWARE UPDATE ................11 BLOCK DIAGRAM .................. 13 EXPLODED VIEW .................. 14 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 3 (Cleaning with a dirty or rough cloth may damage the panel.) CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 Mettre au rebut les batteries usagées conformément aux instructions du fabricant. VORSICHT Explosionsgefahr bei unsachgemäßem Austausch der Batterie Entsorgung gebrauchter Batterien nach Anleitung - 4 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 5: Servicing Precautions

    Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 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. 3. Solder the connections. - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Application Range

    Input Type Single Ended(Analog L/R Stereo) 3P, 3.5mm Phone Jack Input level 0.7Vrms RS232C In UART Comm. w/ IR Daisy Chain 4P, 3.5mm Phone Jack - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 Wireless Remote Control(Infrared Radiation) LG Code REMOCON Working Sensitiv- Working Sensitivity, Straight Min. 12m ity, Straight REMOCON Working Sensitiv- Working Sensitivity, L/R (30º) Min. 9m ity, L/R - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 62368-1 Signal 3000Vac/1sec or 4242Vdc/1sec Current 100 mA(AC) / 10mA(DC) Tilt(Facedown) 30° °(de- in conditions within 30ºC tem- gree) perature, 50% humidity - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 HDTV 1080P 60Hz 1080/60P 67.5 UD 2160P 30Hz 2160/30P HDMI1/2/3, DP, OPS 112.5 UD 2160P 50Hz 2160/50P HDMI1/2, DP UD 2160P 60Hz 2160/60P HDMI1/2, DP - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Usb Download

    3) Connect the USB device to the USB port on the Signage. 4) Push menu button, enter ‘All Settings’ menu. Go to ‘General’ menu. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 5) Press number “7” seven times. 6) Enter Ext.Micom URSA. Press ‘UPDATE’ 7) Finish - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: Block Diagram

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

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 ※Precaution ☞A5 & A3 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 ☞A4 Check and Normal Check various voltages No Video/ replace voltage? of Power Board ( 12V) No audio MAIN B/D Replace Power Board and repair parts Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 Replace Main/T-con B/D device and error normal cable Request repair for external device/cable Check external External device device and /Cable Replace Main/T-con B/D HDMI cable error normal Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 Replace screen? Screen (Check normal operation Main /T-con normal? of External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set- top Box etc. Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: Power Error

    Measure Main Power voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY 7.8V at Power B/D voltage? ☞A10 Replace Power B/D Replace Power Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 Power off by S/W Download "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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 Normal menu > Board Screen normal voltage Speaker Out Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Replace Speaker Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 External Input (In case of External Input signal error) Connect and check Normal Check and fix other external device audio? external device Check and fix external device Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 Replace Main B/D in room (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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 “NG”? INSTART menu Voltage? 1pin Main B/D ☞A13 Close Check & Repair Wifi cable connection ☞A5 Wi-Fi Mac value is “NG”? Close Change the Wifi assy Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 - Fix information signal - S/W Version HDMI/ RGB Check and fix DVI/DP, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 ※ Describe the basis of the description in (For models without any fix information, provide “Part related to nose” in the Owner’s Manual. the description) Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 Revised date 13/13 Module Zoom part Replace module damage with exterior damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 Exchange VX1 or EPI Cable or Main B/D (2) <Appendix> A-2/5 Defected Type caused by Main/ Inverter/ Exchange LED driver Board (PSU) A-3/5 Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 Voltage and speaker checking method when C. Audio error_No audio/Normal video there is no audio WiFi operation checking method D. Function error_ WiFi/BT not working Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 Check LCD back light with naked eye date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from module holes. Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 A. Video error_No video/Normal audio symptom date Monitor Signage Revised Content LED driver B+ measuring method date ※ PSU P/No Power Model Name checking item EAY64269148 LGP75L-16UH12-IT Check 114V Voltage Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 2. Enter into White Balance of item 14. 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Monitor Signage Revised Content Power Board voltage measuring method date PSU P/No Power Model Name checking item EAY64269148 LGP75L-16UH12-IT Check the 12V and PWR_ON Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 Revised Monitor Signage Version checking method Content date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 Monitor Signage Revised Content Monitor signage connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 A. Video error_Color error symptom date Monitor Signage Revised Content Check Link Cable reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 You can view 8 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 Appendix : Exchange VX1 or EPI Cable or Main B/D (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack GRADATION Noise GRADATION A - 2/5 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 Appendix : Exchange Power Board No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 Panel Mura, Light leakage Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage A - 4/5 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 3. 12V Voltage Check : D201~D204 (Cathode Pin) - SET-ON MODE : 12Vdc - STBY MODE : 7.8Vdc If all conditions meet, power AC Input and STBY voltages are OK. SK100 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 POWER OFF MODE checking method date Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 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 ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 1.Check WIFI/BT speed and WiFi/BT MAC are normal in In-Start mode 2. If not OK, check WiFi/BT cable connection between WiFi/BT assy & Main B/D. 3. Check the 3.5V on the pin #1,12 Copyright ⓒ 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.

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