LG OLED55B8STB Service Manual

Chassis eb82b

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OLED TV

SERVICE MANUAL

CHASSIS : EB82B

MODEL : OLED55B8STB

CAUTION

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

P/NO : MFL70425427 (1807-REV00)

OLED65B8STB

CONFIDENTIAL

Summary of Contents for LG OLED55B8STB

Page 1 OLED TV SERVICE MANUAL CHASSIS : EB82B MODEL : OLED55B8STB OLED65B8STB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70425427 (1807-REV00) Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 18 DISASSEMBLY GUIDE................19 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 PC(HDMI Ver. 1.4), Support HDCP Audio Input DVI Audio, Component, AV SPDIF out SPDIF out USB Input For My Media(Movie/Photo/Music List) or For SVC Ethernet Connect - 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 (8) After TV turned on, Check the updated SW Version and Tool Option (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 13 MICOM/IR/ETC 0.9V_CORE 1.2V DDR 3.5A 5V Normal 2.5V DDR4 VPP LDO 1A 3.3V Normal SOC- O18 1.8V IO 0.9V DDR AUDIO AMP. IC FRONT - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 18 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. - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 2. Remove screw 4 EA, disassemble back cover from module. * Put hand on the marked area(O), separate the back cover to the top. Screw : 4 EA, Latch : 11 EA - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 3. Remove screw 1 EA, disassemble Wifi/Jog assy. Screw : 1 EA 4. Remove the latch 2 EA, disassemble IR assy. Slide Latch : 2 EA - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 7. Remove screw 12 EA, disassemble Main PCB and PSU. Screw : 12 EA 8. Remove screw 9 EA, disassemble stand guide and stand fixer. Screw : 9 EA - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 24 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 25 ☞A4 & A2 Always check & record S/W Version and White Balance value Replace Main B/D Re-enter White Balance value before replacing the Main Board Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 26 Check and replace Check Power Board No Video / Main B/D Voltage? output to Main (20V, 12V ) No audio Replace Power B/D or repair parts Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 27 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 28 Replace Main B/D error and cable normal Request repair for external device/cable Check External HDMI external device Replace Main B/D device/Cable error and cable normal Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 29 (Check normal operation of Screen Normal Main B/D / HDMI External Input, Component, normal? screen? Module AV and HDMI by connecting Jig, pattern Generator ,Set- top Box etc. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 30 Measure each output voltage of Power B/D Normal? ☞A10/ Normal Replace Main B/D voltage? Close Normal Check ST-BY (7.8V) voltage? Replace Power B/D Replace Power B/D Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 31 Normal Replace Main B/D Check Power B/D voltage? output voltage ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 32 Module Power off by resume fail when dc on case. POWER_OFF_BY_RESUME_FAIL Check & Change Main B/D If occur the resume fail, TV will be rebooted. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 33 POWER_OFF_BY_PNWASHDONE Power off by panel noise wash function completed. POWER_OFF_BY_COOLING Power off for cool down the OLED t-con. POWER_OFF_BY_EDID_WRITE Power off by EDID write done. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 34 Power Board Speaker or not Select Internal TV Speaker Replace Power Board or repair parts Check Disconnection Replace Main B/D Speaker cable connection Connect Speaker cable Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 35 (In case of External Input Connect and check Normal signal error) other external audio? Check and fix external device device Check and fix external device Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 36 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 37 Download the Firmware •If you conduct the loop at 3times, Instart Memu change Magic Remote control  12.RF Remote control Test  Receiver Firmware Download Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 38 “NG”? Voltage? 19/24 pin Main B/D ☞A16 Check & Repair Close Wi-Fi cable connection ☞A4 Wi-Fi MAC Close is “NG”? Replace the Wi-Fi assy Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 39 Recognition error - S/W Version HDMI/DVI, Check and fix external Fix in Optical Recognition Replace Main B/D device/cable accordance error with technical information Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 40 “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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 41 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 42 Defected Type caused by Cable / Main Board / Module Example of Symptom (Module) A-6/9 Example of Symptom (Module) A-7/9 Example of Symptom (Module) A-8/9 Example of Symptom (Module) A-9/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 43 How to use the Service remote control A17-A19 E. Etc Check items after Main B/D replacement How to use JIG (Power B/D Diagnostic Smart Jig Multi Gender) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 44 Check a voltage of R7632 after turn on the TV. Check a voltage of R7624 after turn on the TV. If it is high, BDP issue.(NG) If it is low, Vx1 is locked.(OK) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 45 2. Enter into ‘12.White Balance’ 3. After recording the R, G, B (Gain, Cut) value of each Color Temp(Cool/Medium/Warm), re-enter the value after replacing Main board. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 46 All Settings  Programmes  Programme Tuning & Settings  Manual Tuning 3. Check the signal level. When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 47 A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date Version 1. Press ‘IN START’ button on Factory SVC Remote control. 2. Check S/W Version Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 48 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 49 Residual image, Light spot date Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 50 A. Video error_Color 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 51 You can view 11 types of patterns using the CH+ or - 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 52 Screen darkness to disconnection of the FFC cable pin. G Color G color transient due to poor FFC cable Cable connection Excessive A - 1/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 53 Vx1 cable connection problem Cable Color spread Vx1 cable connection problem Due to foreign substance withi nLVDS Cable Screen stop cable PIN A - 2/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 54 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 - 3/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 55 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 56 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 - 5/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 57 Source Driver issue Module White dot White dot cause by panel issue Module Line Dim Vertical Line cause by source drive IC A - 6/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 58 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 - 7/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 59 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 - 8/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 60 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 - 9/9 Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 61 Stand-by condition : Red Power On condition : Turn Off ※ Power indicator control Menu  All Settings  General  Standby Light  ON/ Off Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 62 Check 12VM line for ST-BY Voltage ST-BY status : 7.8V, Power on(DC On) status : 12V Power to Main B/D P201 P251 Power To Module Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 63 POWER OFF MODE checking method date 1. Press ‘IN START’ button on Factory SVC Remote control 2. Check the entry into ‘3. Power On/Off Status’. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 64 Checking method in menu when there is no audio date 1. Press ‘MENU’ button. 2. Select ‘All Settings’ 3. Select ‘Sound’ menu and ‘Sound Out’. 3. Select Internal TV Speaker. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 65 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 66 3. AS checking the Pre-Amp of IR B/D(③) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 67 1. Enter into ‘Instart’ menu with press ‘IN START’ button and check the condition of Wi-Fi and BT. 2. Check Wi-Fi/BT cable condition between Wi-Fi/BT ass’y and Main board. 3. Check +3.5V_WIFI on pin 19/24. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 68 Standard Repair Process Detail Technical Manual Error Established E. etc. symptom date Revised Content How to use Factory SVC Remote control date 1. How to access Instart/Adjust menu. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 69 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 70 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 71 - 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 © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 72 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 21 (1/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 73 24 Marking Check UK74 28Pin 28Pin 12Pin 12Pin 28Pin UK75 Cable Connection UK78 Includes 49UJ63 SK79 17Y/18Y 16/18Y 16Y/17Y 16Y/17Y/18Y (SJ/UJ/UK/SK) (UH) (UH/UK) A21 (2/19) (UH/SJ) (LH/LJ/LK) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 74 SJ95/UJ98 SJ85/UJ94 SJ80, UJ77 UJ75/UJ78 ’17 UJ65/UJ68 UJ63/UJ67 LJ61/LJ68 LJ55/LJ58 SK80/SK85/SK95 UK78/UK75/SK79 ‘18 UK63/UK64/UK65/UK7050 32LK61/62, 43/49LK61 B8, C8, E8 ‘18 OLED G8, W8 A21 (3/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 75 “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A21 (4/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 76 - 20V Power Board : Change the switch to 24V of Smart Jig Voltage - 13.2V/18V Power Board : Change the switch to 24V of Smart Jig Voltage Power B/D Smart Jig Voltage Switch 13.2V/18V A21 (5/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 77 ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A21 (6/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 78 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. A21 (7/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 79 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. A21 (8/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 80 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A21 (9/19) Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 81 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (10/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 82 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (11/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 83 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (12/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 84 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (13/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 85 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (14/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 86 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (15/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 87 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (16/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 88 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board A21 (17/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 89 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (18/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
Page 90 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (19/19) can be judged as defective. Copyright © 2018 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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