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LG OLED55CX5LB Service Manual
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LG OLED55CX5LB Service Manual

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OLED TV
SERVICE MANUAL
CHASSIS : EDX1C
MODEL: OLED55CX*LA / 5LB
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71696201 (2001-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.
OLED65CX*LA / 5LB

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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 ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 12 ASSEMBLY / DISASSEMBLY GUIDE ............ 13 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.

  • Page 4: Servicing Precautions

    - 4 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.

  • Page 6: Specification

    DVB-S (QPSK) : 2 ~ 45Msymbol/s - Viterbi DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8 DVB-S2 mode: 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10 - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 1920*1080 33.75 60.00 74.25 HDTV 1080I 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.43 59.94 148.50 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 135.00 60.00 UDTV 2160P UHD DEEP COLOUR ON - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 297.00 UDTV 2160P 3840*2160 56.25 25.00 297.00 UDTV 2160P 3840*2160 67.5 30.00 297.00 UDTV 2160P 4096*2160 53.95 23.97 296.703 UDTV 2160P 4096*2160 UDTV 2160P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (6) Turn OFF the TV and On. Check the updated SW Version (8) After TV turned on, Check the updated SW Version and and Tool Option. Tool Option. - 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. - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 Total Screw No. : 33 EA 1. Disassemble stand cover from back cover. * Push the latch, separate the stand cover to the top. Latch : 2 EA - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 2. Remove screw 4 EA, disassemble stand from back cover. Screw : 4 EA 3. Remove screw 1 EA, disassemble power cord from back cover. Screw : 1 EA - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 ), separate the back cover to the top. Screw : 4 EA, Latch : 12 EA 5. Remove screw 1 EA, disassemble Wifi/Jog assy. Screw : 1 EA - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 6. Remove the latch 2 EA, disassemble IR assy. Latch : 2 EA Slide 7. Remove all sort of cable. - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 8. Disassemble speaker. 9. Remove screw 12 EA, disassemble Main PCB and PSU. Screw : 12 EA - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 10. Remove screw 7 EA, disassemble stand guide and stand fixer. Screw : 7 EA 11. Remove screw 4 EA, disassemble VESA Bracket Screw : 4 EA - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 20 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 21 ☞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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 22 ☞A18 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 23 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 24 Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 25 Replace (Check normal operation of screen? HDMI/ Screen Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 26: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Normal Close Check Main ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power B/D Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 27 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 28 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 29 Screen normal of Power Board voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 30 (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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 31: 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 32 5sec RF Receiver ver Close is “00.00”? Replace MR20 Close Replace MR20 * If you conduct the loop at 3times, change the MR20. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 1pin 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 for training and service purposes...
  • Page 34 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 “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 for training and service purposes...
  • Page 36 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 Exchange Module (1) ~ (3) A-6/11 ~ A-8/11 Inverter/ Module Exchange T-Con (1) ~ (2) A-9/11 ~ A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 38 Remote control operation checking method D. Function error Motion Remote operation checking method How to use the Service remote control A15-A17 E. Etc Check items after Main B/D replacement Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40  All settings  Programmes Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 Revised 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 43 Revised Content connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 44 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1/EPI) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 45 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 46 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 47 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 48 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 49 Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 50 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 52 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 53 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 54 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 55 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 56 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 57 - SET St-by : 0V 6. T-CON 12V Check : P252 - SET On : above 12V - SET St-by : 0V All condition meets, Power Board OK. Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 58 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 59: 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 60 3.Connect the tester P5400 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 61 2. Check the Main standby 3.5V on the terminal (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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 62 Checking order to check motion remote/wifi KEY1 Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the Main 3.5V on the terminal 1 pin Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 63 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content How to use the Service remote control date 1. How to access the remote control Copyright © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 64 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 65 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 66 - 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 © 2020 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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