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LG 50UR80 0PSB Series Service Manual
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LG 50UR80 0PSB Series Service Manual

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LED TV
LED TV
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : UB35D
MODEL : 50UR8000PSA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL72006802 (2212-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.
50UR80*0PSB

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Summary of Contents for LG 50UR80 0PSB Series

  • 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 BLOCK DIAGRAM .................. 11 EXPLODED VIEW .................. 12 WIRING DIAGRAM ................13 ASSEMBLY / DISASSEMBLY GUIDE ........... 14 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: Wiring Diagram

    WIRING DIAGRAM Power Board Main Board SPEAKER SPEAKER WIFI - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 2. Disassemble all marked screws ( *SCREW TORQUE : 5 ~ 7Kgf.cm *CAUTION : Before lifting B/C, Screw and Latch must be disassembled first. *Screw Spec. M3*5.5 M4*10 - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 ⓐ ⓐ ⓐ ⓑ ⓑ Step2) Upper Right(Left) Side Step1) Lower Right(Left) Side PUSH PUSH Latch Push Latch Push PULL PULL Pull Pull - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 - Latchⓑ : 2 Points ⓑ ⓐ ⓐ ⓑ * Caution : Latch can be separated on the top position, don’t pull it hard for upward - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 - Latchⓐ : 6 Points - Latchⓑ : 2 Points ⓑ ⓐ ⓐ ⓑ • Press direction - Oblique direction from the outer surface - 17 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 If the latch is nor properly assembled, press the area again 3. Assemble the screws. (12ea) *Screw Spec. Screw 12 Points M3*5.5 M4*10 *SCREW TORQUE : 5 ~ 7Kgf.cm - 18 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 (2) Disassemble SPCB Cover shield screws 5ea. (Use General Screw Driver) (3) Disassemble the screw, and then move each SPCB cover field L/R upward to disassemble it. - 19 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 (5) Disassemble 6screws on the lower side of the C/top - Screw Spec: M3*8 (Silver) - Driver : Normal size screw TIP Driver is available. - 20 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 (Case Top down Screw already released, so be caution Case top down falling when Reverse LCM) (8) Case Top Down release - Disassembly horizontally side direction - 21 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 After Releasing Guide Panel all rounded hook, Remove Guide Panel-Board assy with UP Direction UP : 8ea Left : 4ea Right : 4ea Down : 6ea Hook - 22 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 - As the reflector hole is fixed to the lens, disassemble the reflector by release the the fixation of lens from the end on the right. a fixed part a fixed part - 23 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 (15) Assembly of the Led array connector- Attach the connector on the wire ass’y by pushing it upward and downward. (16) Attach the reflector sheet. - Check Down side Sheet hanger position. Check the down shape - 24 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 - Assemble the sheet shape (Chamfer) on the front left side of the SET. Diffuser Plate: Chamfer Diffuser Plate 1ea Sheet: Chamfer Sheet 1ea SET Front Direction Left down Chamfer - 25 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 - Screw Spec: M3*8 (Silver) - Driver : M3 Screw Module Driver available. * Caution : While Screw assembly, be care SPCB COF damage from driver Tip. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 - Screw Spec : M2*4.0mm Tapping Screw(BLACK) - Location : Up(5ea)/Left(3ea)/Right(3ea) - Driver : Normal size screw TIP Driver is available. LEFT RIGHT Guide Panel Back Screw point - 27 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 (26) Assembly SPCB Cover shield to Cover Bottom. (27) Assemble SPCB Cover shield screws 5ea. (Use M3 Screw module Driver) FINISH - 28 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 29: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 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 for training and service purposes.
  • Page 31 ☞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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 ☞A9 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External HDMI device and device/Cable Replace Main/T-con B/D error cable normal Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Replace (Check normal operation of HDMI/ Screen Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 36: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check Power ST-BY 7.8V voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Wireless model only Process/SVC F0~F9, FA~FZ Process/SVC Records (in-stop, Power Only etc) Normal Case - N/A Records Initial value Initial value not recorded yet Normal Case Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Screen normal 13.2V of Power voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 (In case of Connect and check External Input Normal other external signal error) audio? device Check and fix external device Check and fix external device Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 41: 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Down load the Firmware * If you conduct the loop at 3times, change the MR23. * INSTART MENU  14.RF Remote control Test  3. Firmware download Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Main B/D INSTART menu is “NG”? ☞A15 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Recognition error - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in Recognition external device/cable accordance error with technical information Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Cable Make the Connect network function ‘on’ Close Close Change Voice Cable Connection Recognition Change Main B/D Is OK? Ass’y Close Re-connect Close Cable Close Copyright © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2023 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 © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Check LCD back light with naked eye Content date 50UR80/81 After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2023 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 © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 Revised Content Version checking method 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 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 © 2023 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 © 2023 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 50UR80/81 Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 69 SK100 (AC input) 50UR80/81 104.4V 127.6V ※ Depending on Model Power Board is different. But Interface(P801, P201) and Spec is same all condition meets, Power Board OK. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 70 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 75 E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control 1 page 2 page Copyright © 2023 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 © 2023 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 © 2023 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 79 You can view 11 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 for training and service purposes.
  • Page 80 If the result comes out ‘NG’ for each part, make sure to check the connector check again between the part and the cable is properly connected. (Check if the cable connection is normal) 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 81 (Some models launched before 2017 may have 5V / 3.5V) 3. If the result comes out ’NG’, replace Power Board ● Note. 1 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 82 2. Check the output voltage of 20VS and 12VM 3. If the result comes out ’NG, check the voltage of PWR_ON ● Note. 2 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 83 3. If the result comes out ’NG, replace Main Board. If it comes out ‘OK’, replace Power B/D 4. The normal power supply from MAIN to POWER is 3V or higher ● PWR_ON Note. 3 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 84 2. If the result comes out ’NG, replace Power B/D. If it comes out ‘OK’, check if Main B/D and Module operate normally. Note. 4 / 4 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 85 Connect the T-Con ~ motherboard FFC cable to the Jig A jig for sending test patterns ※ SVC Part P/No : RAD33749101 Parts connecting Cable Appendix. 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 86 VDD-EPI / 2 HVDD HVDD uses half the voltage of VDD-EPI (7.7V~8.1V) VDD-EPI 16.2V ~ 16.8V VGH1 32V ~ 36V VCC1.8 Appendix. 1 / 1 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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