LG OLED55B1PTA Service Manual

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OLED TV

SERVICE MANUAL

CHASSIS : EB12B

MODEL: OLED55B1PTA / PVA

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71817401 (2102-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.

OLED65B1PTA / PVA

Summary of Contents for LG OLED55B1PTA

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 ................. 12 EXPLODED VIEW .................. 13 ASSEMBLY / DISASSEMBLY GUIDE ............ 14 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 3 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 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 3. Test method (1) Performance: LGE TV test method followed (2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC specification - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 DVI Audio, Component, AV SPDIF out (1 EA) Optical Audio out USB Input (3 EA) EMF, For SVC (download) Ethernet Connect (1EA) STP cable - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 8 107.89 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 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 9 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 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 10 (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. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 11 “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 - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 13 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 14 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 - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 15 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 - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 16 ), 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 - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 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 - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 22 ☞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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 23 Check various voltages Check and No Video/ Normal of Power Board (Main) replace No audio voltage? (20V, 12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 24 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 25 Replace Main B/D error cable normal Request repair for external device/cable Check external External HDMI device and device/Cable Replace Main B/D error cable normal Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 26 (Check normal operation of HDMI/ Screen screen? Main B/D / External Input, Component, normal? RGB and HDMI/DVI by Module connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 27 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY (7.8V) voltage? ☞A9 Replace Power B/D Replace Power Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 28 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 29 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 30 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection connecting Speaker Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 31 (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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 32 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 33 Down load the Firmware •If you conduct the loop at 3times, * INSTART MENU  12.RF Remote control Test change the MR21.  Receiver Firmware download Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 34 Voltage? 1pin Main B/D INSTART menu ☞A14 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 35 Recognition error signal - 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 36 “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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 37 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 38 Exchange Main Board (2) A-2/5 <Appendix> Exchange Power Board (PSU) A-3/5 Defected Type caused by T-Con/ Power / Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 39 Motion Remote operation checking method Wifi operation checking method How to use the Service remote control A15-A17 E. Etc Check items after Main B/D replacement Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 40 Check the voltage of R7632 (Blue). If the voltage is low, Vx1 is locked.(OK) - Low (0V) : Normal, High (3.3V) : Burnt Detect Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 41 2. Enter into White Balance of item 12. 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 42 All Settings  Programmes  Programme Tuning & setting  Manual Tuning  Antenna DTV When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 43 A. Video error_Video error, video lag/stop Error symptom date Revised Content OLED TV Version checking method date Version Press the IN-START with the remote control for adjustment Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 44 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 45 Revised Content OLED TV Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 46 Error symptom date Revised Content Check Link Cable (Vx1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 47 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 48 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 49 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 - 3/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 50 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 51 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 - 5/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 52 Source Driver issue Module White dot White dot cause by panel issue Module Line Dim Vertical Line cause by source drive IC A - 6/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 53 Horizon line Module has damaged Module has damaged Module Line Defect Un-repairable Cases Module Press damage In this case please exchange the module A - 7/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 54 In this case please exchange the module difference Compensation error when Power On/off Module Green light Color difference between screen cause Module Color difference by compensation error A - 8/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 55 Module has damaged Module No image (Can’t fix it) Burnt Module Burnt (Can’t fix it) Screen Mura Module Mura (Can’t fix it) A - 9/10 Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 57 Revised Content Check front display Logo Content Check front Power Indicator date date ST-BY condition : On or Off Power ON condition : Turn Off Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 58 Check the DC 12VT line for ST-BY Voltage 55/65B1 Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P201 P252 P251 Power To Module Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 59 Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Check the entry into adjustment item 3 (Power On/Off Status). Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 60 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 61 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 62 2. Check the Pin 22, Standby Power 3.5V (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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 63 Checking order 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Terminal Pin 1, Pin 6, Pin12, Check 3.5V Power. (No. ③) Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 64 Standard Repair Process Detail Technical Manual Established E. Etc Error symptom date Revised Content How to use the Service remote control date How to access the remote control Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 65 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 66 Connects to external input 1,2,3 COMP1,2 (Added Connects to Component 1,2 function) HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 67 - 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 © 2021 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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LG OLED55B1PTA Service Manual

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