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LG 75UH5F-HJ Service Manual
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LG 75UH5F-HJ Service Manual

Chassis uw82a
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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 : MFL71500384 (2007-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 © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
UW82A
75UH5F
75UH5F-HJ

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Summary of Contents for LG 75UH5F-HJ

  • 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 ................10 BLOCK DIAGRAM .................. 11 EXPLODED VIEW .................. 12 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

    DP : 3840x2160@60hz Max. hDMI3, OPS : 3840x2160@30hz DVI-D : 1920×1080@60hz Resolution Digital hDMI1/2, DP : 3840x2160@60hz recommend hDMI3, OPS : 3840x2160@30hz DVI-D : 1920×1080@60hz - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 INPUT, MENU, ˄, ˅, ˂, ˃, AUTO/SET, Φ/I 8 keys Set Installation Wall Mount LSW640A (VESA 600 x 400) PIP / PBP Mode O/O(2 /3 /4) - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 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 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 10: Usb Download

    1) Push "IN-STArT" key in service remote control. 2) Select "Tool Option 1" and Push “Ok” button. 3) Punch in the number. (Each model has their number.) - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: 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 13: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 D. Noise Circuit noise, mechanical noise E. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 ※Precaution ☞A3 & 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 Check various Check and voltages of Power No Video/ Normal replace Board ( 12V,20V or No audio voltage? MAIN B/D 24V…) Replace Power Board and repair parts Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 Request repair for external device/cable Check external External HDMI / DVI-D device and Replace Main B/D device /Cable / DP error cable normal Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 (Check normal operation of Replace Screen screen? External Input, Component, DVI-D Main B/D normal? RGB and HDMI/DVI by Diplay Port connecting Jig, pattern Generator ,Set-top Box etc. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 On ‘”High” operation? On Remote control Replace Main B/D ☞A12 Measure voltage of each output of Power B/D Normal Replace Main B/D voltage? Replace Power B/D Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close Explain the customer operating? cause is interference from light in room. Replace R/C Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 Recognition error - S/W Version HDMI/DVI, Check and fix Replace Main B/D Optical Recognition Fix in external device/cable error accordance with technical information Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 “NG”? Voltage? INSTART menu Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi MAC value Close is “NG”? Change the Wifi assy Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 “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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 Revised date 11/11 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 <Appendix> 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 Check power input Voltage & ST-BY 3.5V B. Power error_Off when on, off POWER OFF MODE checking method while viewing D. Function error IR Cable operation checking method Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 Check LCD back light with naked eye Content date <75/86UH5F> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 2. Enter into White Balance of item 11. 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 Revised 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 Revised Content Connection diagram (1) date <75/86UH5F> As the part connecting to the external input, check the screen condition by signal Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 Error symptom date Revised Content Check Link Cable (Vx1) reconnection condition date <75/86UH5F> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Appendix : Exchange Main Board (2) 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 B. Power error _No power Error symptom date Revised Check power input voltage Content date <75/86UH5F> Check the DC 20V, 12V. ’15Y 적용 28Pin map (PSU) Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 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 ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 3. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 M_RFMODULE_RESET Checking order to check motion remote/wifi Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 2 Copyright ⓒ 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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