LG OLED55B3 Series Service Manual

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OLED TV

SERVICE MANUAL

CHASSIS : E*32B

MODEL : OLED55B3***

CAUTION

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

P/NO : MFL71991231 (2301-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.

OLED65B3***

Summary of Contents for LG OLED55B3 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 SOFTWARE UPDATE ................12 BLOCK DIAGRAM ................. 14 EXPLODED VIEW .................. 15 WIRING DIAGRAM ................16 ASSEMBLY / DISASSEMBLY GUIDE ............ 17 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 - Digital TV : DTMB (China/Hongkong), DVB-C (China) - Analogue TV : PAL D/K,I, NTSC-M (China/ Hongkong) 4) Philliphine - Digital TV : ISDB-T - Analogue TV : NTSC-M - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 * Hong Kong - 3780, 0.4/0.6, 4/16/64QAM, PN945, 720 ► DVB-C - Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s - Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 9 Optical Audio out Audio out HeadPhone(1EA) HeadPhone out USB Input (3EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD Ethernet Connect (1EA) Ethernet Connect - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 10 UHD DEEP COLOUR ON When HDMI 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI 4096*2160 135.00 60.00 UDTV 2160P UHD DEEP COLOUR ON - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 11 297.00 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 - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 12 (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 - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 13 “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 - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 15 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. - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 18 3. Put the hand in the gap between the back cover and the module, then lift the back cover upwards to separate it. 4. Unlock “5” screw to Wifi bracket using screw driver. - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 5. Remove the “6” latch, disassemble IR assy. Slide 6. Separate “7” connector from PCB. Eliminate “8” Tape. - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 8. Unlock “10” screw to PCB and supporter using screw driver. 9. Separate “11” connector from PCB, and dissemble IR Ass’y, Wifi Ass’y and cable. - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 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 23 Repair Power Board or parts ※Precaution ☞A4 Always check & record S/W Version before Replace Main Board Re-enter White Balance value replacing the Main Board Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 24 Check various voltages Check and No Video/ Normal replace of Power Board (Main) No audio voltage? (20V, 12V…) MAIN B/D Replace Power Board and repair parts Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 25 1. Reconnection 2. Install Booster S/W Upgrade Normal Contact with signal distributor Picture? or broadcaster (Cable or Air) Normal Picture? Replace Main B/D Close Close Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 26 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 27 (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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 28 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 29 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 30 M0 ~ MF Wireless Model Wireless Model only F0 ~ FF Factory/SVC Factory /SVC (ex. in-stop, Power Only, etc) Normal Code - N/A Reserved Normal Code Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 31 20V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection connecting Speaker Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 32 (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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 33 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 34 Down load the Firmware •If you conduct the loop at 3times, * INSTART MENU  12.RF Remote control Test change the MR23.  Receiver Firmware download Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 35 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 36 Recognition error signal - 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 37 KMS fix information and 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 38 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 39 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 40 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 41 Check the voltage of R7632 (Blue). If the voltage is low, Vx1 is locked.(OK) - Low (0V) : Normal, High (3.3V) : Burnt Detect Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 42 Content TUNER input signal strength checking method date Select “Gear”  General  Programmes  Programme Tuning & setting  Manual Tuning  Antenna DTV Copyright © 2023 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 © 2023 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 © 2023 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 © 2023 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 © 2023 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 G color transient due to poor FFC cable CABLE connection Excessive A - 1/11 Copyright © 2023 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 - 2/11 Copyright © 2023 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 - 3/11 Copyright © 2023 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 - 4/11 Copyright © 2023 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 - 5/11 Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 52 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 53 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 54 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 56 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 58 B. Power error _No power Error 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 59 Power To Main B’d 77B3 Check the DC 12VT line for ST-BY Voltage (ST-BY : 7.8V, Normal : 12V) P201 P202 P251,P252 Power To Module Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 60 55/65B3 Check the DC 12VT line for ST-BY Voltage Power To Main B’d (ST-BY : 7.8V, Normal : 12V) P201 P252 P251 Power To Module Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 61 Entry method 1. Press the IN-START button of the remote control for adjustment. 2. Press the navigation key(Right) 3 times, entry into SVC menu 2 page. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 62 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 63 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 64 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 65 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 66 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 67 E. Etc Error symptom date Revised Content How to use the Service remote control date How to access the remote control Press the button 3times. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 68 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 69 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 © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 70 If the TV Screen is a white pattern and the pop-up window does not appear when connecting USB. Press the “BACK" or “EXIT” on the remote controller for 3 seconds to switch to White noise screen. Copyright © 2023 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Page 71 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 72 (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 73 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 74 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 75 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 76 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.

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LG OLED55B3 Series Service Manual

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