LG 75UQ9000PSD Service Manual
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LG 75UQ9000PSD Service Manual

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LED TV
LED TV
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : UB13D
MODEL : 75UQ9000PSD
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71903707 (2201-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 © 2022 LG Electronics Inc. All rights reserved. Only training and service purposes.

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Summary of Contents for LG 75UQ9000PSD

  • 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 SOFTWARE UPDATE ................9 BLOCK DIAGRAM .................. 11 EXPLODED VIEW .................. 12 ASSEMBLY / DISASSEMBLY GUIDE ........... 13 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

    * Some models do not support HDMI4 USB Input My Media(Movie/Photo/Music List) or SVC SPDIF out Optical Audio out Ethernet Connect AV Input CVBS, Audio LR Only for INDIA - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 8K Model Only. 7680*4320 1188 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 UHD DeepColor is On (UHD, 8K 120Hz models only), 2560*1440 182.99 119.99 497.7 Support only when UHD Deep- Color is On - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9 (6) After finishing the update, it will show a pop-up below the picture. (7) Click “Yes” : Tv will be turn off and on itself - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 10 “The latest version of the SW is available for your TV. Do you want to update now” (3) [Yes] : update starts. [No] : Close the pop-up, check out later - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for 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. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 Back Cover Curling shape Cover Bottom+ Holder Back Cover Assembly = Module (Holder) + Back Cover (Curling) 425mm 425mm 225mm 225mm Screw 18EA Holder 6EA - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 Stripper Stripper <Step1> <Step2> (5) Two people grasp Back Cover and remove Back Cover. - Grasp position : 600~800mm 600~800mm 600~800mm <Step2> <Step1> - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 → 2 People Grasp : Long side shoulder width 600~800mm → 2 people set up : 4-corner Handling ▪ Two people Handling Guide - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 (2) Confirm Latch Assemble part (If Latch is not assemble, Gap and lifting are made.) Gap between B/C and Module Direction of PUSH - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 [Assemble Guide] 1. Attach the INSULATOR. 2. Assemble/Fix the SUPPORTER + MODULE. Description LCD, Module Insulator Stand Supporter Screw - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 Speaker Rubber 4. Assemble/Fix the POWER / MAIN PCB + MODULE. Description Power Supply Assy Chassis Assy Screw - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 7. When Attach the tape for fixing Harness at Module, Rub the tape 2~3 times for adhering totally. Description Tape (Insert SPK HARNESS into the hook only at the marked “ “ part) - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 (Press the edge of mark rubbing it using palm to insert holder) 414mm 253mm 260mm 120mm Description Cover Assy Rear Top Screw Screw Screw - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 10. Assemble COVER on the REAR COVER. 11. Fix the POWER CORD + BACK COVER with SCREW. 12. Attach the TAPE. Description Power Cord Assy Screw Tape - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 - Disassemble the source PCB from the guide. (Remove bridge FFC tape 2ea after disassembly.) (2) Disassemble of Guide panel - Disassemble the Screws. (UP/RIGHT/LEFT Total : 14ea ) - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 * Fix the S-PCB to Panel(use the tape). 2. The Guide of Panel assy (with Guide pael) (1) Disassemble of Guide panel *Disassemble Hooks with flat stick. - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 (2) Removal of Sheets and Diffuser Plate SET Front Direction Left down Chamfer Diffuser Plate 1ea Diffuser Plate: Chamfer Sheet: Chamfer Sheet 1ea - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 1) Attach the double tape to the round hole on Cover Bottom embo. 2) Remove the protect film of Double Tape with taking off the handler. - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 * Assemble the reflector sheet bellow the lens with your fingers. * In the case of corner and center, place the side marked UP on top. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 * There is chamfer in the lower left corner of the DP and sheet. (4) Assemble the Panel and Guide Panel. * Assemble the upper left/right first and assemble the bottom left/right. - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 (7) Assemble the case top screws. * Bottom side screws 9ea. * When the left and right ends, hold case top by hand. - 28 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 - Guide Panel Screws (Up 6ea / L 4ea / R 4ea) - Cover Shield Screws (Left 3ea / Center 1ea / Right 3ea). - 29 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 ☞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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 ☞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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Replace Main/T-con B/D error normal cable Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/ Cable error cable normal Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 Replace screen? HDMI/ Screen (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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 37: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Check ST-BY 7.8V Close voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Replace Main B/D Normal? Error? Abnormal Check for all phase Replace Power B/D Abnormal power out Fix A/C cord & Outlet and check each phase out Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Power Board Screen normal voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Speaker Disconnection disconnection Replace Speaker Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 (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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 42: 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 “00.00”? Replace MR22 Close Change the RF Receiver assy Or RF Receiver Cable * If you conduct the loop at 3times, change the MR22. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 1pin Main B/D INSTART menu “NG”? ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Recognition error - S/W Version HDMI/ DVI, Optical Check and fix Replace Main B/D Fix in Recognition external device/cable accordance error with technical information Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 “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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Revised date Module Zoom part with Replace module damage exterior damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Exchange Module (1) ~ (3) Inverter/ Module A-8/11 A-9/11 ~ Only using Exchange T-Con (1) ~ (2) T-con model A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Motion Remote operation checking method How to use the Service remote control A24-A26 E. Etc Check items after Main B/D replacement Adjustment Test pattern - ADJ Key Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 All Setting  General  Programmes  Programme Tuning & Settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Version checking method date <ALL MODELS> 1. Checking method for remote control for adjustment Version RELEASE Press the IN-START with the remote control for adjustment. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 Revised Content connection diagram date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 A. Video error_Color error symptom date Revised Content Check Link Cable(Vx1/EPI/CEDS) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 CABLE Screen darkness disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 CABLE Color spread FFC connection problem CABLE Color spread FFC connection problem Due to foreign substance within CABLE Screen stop FFC PIN A - 2/11 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 Screen picture spread problem Screen problem No problem at the initial stage. Right-side picture Main During Heat run, right-side picture problem problem A - 5/11 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 62 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 66 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 67 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 68 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 69 - SET On : above 3V - SET St-by : 0V 5. LED voltage Check : p801 SK100 (AC input) All condition meets, Power Board OK. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 <ALL MODELS> RELEASE Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3. Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 71: 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 72 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 73 2. Check the standby 3.5V on the terminal 22 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 74 MIC_CLK 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board.( Check ① and ②) 2. Check the 3.5V on the terminal 1. (③) Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 75 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 RELEASE Copyright © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 76 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 77 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 78 - 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 79 You can view 9 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 © 2022 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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