LG OLED55BXAUA Service Manual Download

Page: 28 / 66

No audio

Screen normal

Internal TV

Speaker

Select Internal TV Speaker

Check

audio B+ voltage(20V)

of Power Board

Normal
voltage

Replace Power Board or repair parts

Check Speaker

cable connection

Connect Speaker cable

Replace Main B/D

End

C. Audio error

No audio / Normal video

☞

A13

☞

A14 & A10/A11

Disconnection

Established

date

Revised date

Error

symptom

Standard Repair Process

Only for training and service purposes.

Summary of Contents for OLED55BXAUA

Page 1: ...simile 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...

Page 2: ... reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 9 BLOCK DIAGRAM 10 EXPLODED VIEW 11 ASSEMBLY DISASSEMBLY GUIDE 12 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ...he set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as ...

Page 4: ...c charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrosta...

Page 5: ...oints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 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 3 Solder the connections CAUTION Maintain original spacing between the replaced component...

Page 6: ...utes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA CE IEC specification EMC FCC ICES CE IEC specification 4 General Specification No Item Specification Remark 1 Market North America 2 Broadcasting system ATSC NTSC M 64 256 QAM 3 Available Channel VHF 02 13 UHF 14 69 DTV 02 69 CATV 01 135 CADTV 01 135 4 Receiving system ...

Page 7: ...0P Not Support for FHD 17 3840 2160 112 5 50 594 UDTV 2160P Not Support for FHD 18 3840 2160 134 86 59 94 593 4 UDTV 2160P Not Support for FHD 19 3840 2160 135 60 594 UDTV 2160P Not Support for FHD 20 4096 2160 53 95 23 98 296 7 UDTV 2160P Not Support for FHD 21 4096 2160 54 24 297 UDTV 2160P Not Support for FHD 22 4096 2160 56 25 25 297 UDTV 2160P Not Support for FHD 23 4096 2160 61 43 29 97 296 ...

Page 8: ...for FHD 28 3840 2160 134 86 59 94 593 4 UDTV 2160P Not Support for FHD 29 3840 2160 135 60 594 UDTV 2160P Not Support for FHD 30 3840 2160 225 100 1188 UDTV 2160P 4K120 model K6Hp HDMI 3 4 port O20 or 8K model 31 3840 2160 269 73 119 88 1186 8 UDTV 2160P 32 3840 2160 270 120 1188 UDTV 2160P 33 4096 2160 53 95 23 98 296 7 UDTV 2160P Not Support for FHD 34 4096 2160 54 24 297 UDTV 2160P Not Support ...

Page 9: ...About This TV page for update 5 TV is updating 6 After finished the update below Pop up appear 7 Click Yes TV will be DC OFF ON 8 After TV turned on Check the updated SW Version and Tool Option 2 NSU This Function is needed to connect to the internet 1 Menu All Settings Support Software Update 2 Click CHEK FOR UPDATES system check newest version 3 Click DOWNLOAD AND INSTALL 4 TV is updating 5 Afte...

Page 10: ...X_TAL 24MHz T2 C S2 Tuner w o D D D Demod od I2S Out I2C 0 I2C 5 R E A R YPbPr SPDIF OUT ETHERNET SUB ASSY IR KEY WIFI BT Combo USB_WIFI CVBS HDMI1 HDMI 2 0 HDMI3 ARC eARC HDMI 2 1 USB2 2 0 HP HDMI2 HDMI 2 0 AV OCP OCP USB3_0 USB2_2 PHY2_RX0N PHY1_RX0N I2C 3 SIF HDMI4 HDMI 2 1 PHY0_RX0N T CON CVBS COMP KGD DDR4 2GB I2C 2 USB1 2 0 OCP USB2_1 Depend on Region Depend on Region I_P I_N Q_P Q_N I2C 1 H...

Page 11: ...rts are identified by in the 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 IMPORTANT SAFETY NOTICE 200 400 540 800 200T 810 530 HR1 HP1 811 811 121 HS1 920 120 500 501 570 HW1 LV1 LV2 HR2 AR2 A10 700 St...

Page 12: ...SEMBLY DISASSEMBLY GUIDE Total Screw No 33ea 1 Remove screw 1ea disassemble power cord from back cover Push the latch separate the stand cover to the top Latch 2 EA 1 2 Remove screw 4ea disassemble stand from back cover Push the latch separate the stand cover to the top 1 1 1 1 1 1 Screw 4 EA 1 ...

Page 13: ...g and service purposes 3 Remove screw 1ea disassemble power cord from back cover 1 Screw 1 EA 1 4 Remove screw 4 EA disassemble back cover from module Put hand on the marked area separate the back cover to the top 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 Screw 4 EA 1 Latch 12ea 2 ...

Page 14: ...yright LG Electronics Inc All rights reserved Only for training and service purposes 5 Remove screw 1ea disassemble Wifi Jog assy Screw 1ea 1 6 Remove the latch 2ea disassemble IR assy Latch 2ea 2 1 2 2 Slide ...

Page 16: ...c All rights reserved Only for training and service purposes 9 Remove screw 12ea disassemble Main PCB and PSU 10 Remove screw 7ea disassemble stand guide and stand fixer 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Screw 7ea 1 Screw 12ea 1 ...

Page 19: ...e viewing power auto on off 7 8 8 C Audio error No audio Normal video 9 9 Wrecked audio discontinuation noise 10 10 D Function error Remote control Local switch checking 11 11 Magic Remote control operating checking 12 12 Wi Fi operating checking 13 13 External device recognition error 14 14 E Noise Circuit noise mechanical noise 15 15 F Exterior error Exterior defect 16 First of all Check whether...

Page 20: ...lways check record S W Version and White Balance value before replacing the Main Board Replace Main B D Re enter White Balance value Precaution Established date Standard Repair Process Revised date Error symptom A Video error No video Normal audio A10 A11 A10 A11 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D Vx1 Cable Speaker Cable IR B...

Page 21: ...o Check and replace Main B D Y Replace Power B D or repair parts N End Standard Repair Process No video No audio A10 A11 Established date Revised date Error symptom 2 A Video error Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 22: ...agnostics menu on OSD All Settings Programmes Programme Tuning Settings Manual Tuning Antenna DTV Check the signal level Signal Strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Established date Revised date Error symptom 3 N Y N S W Upgrade SVC Bulletin Normal Pic...

Page 23: ...k external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main B D Replace Main B D N N Color error A6 N Y End Replace Module Request repair for external device cable Color error Check Test pattern A8 A7 Standard Repair Process Established date Revised date Error symptom 4 A Video error Copyright 2020 LG Electronics Inc All rights reserved Only f...

Page 24: ... Input HDMI DVI by connecting Jig pattern Generator Set top Box etc N Y Replace Main B D Module Screen normal Check screen condition by input External Input AV Component HDMI Request repair for external device HDMI Connect other external device and cable Check normal operation of External Input Component AV and HDMI by connecting Jig pattern Generator Set top Box etc Replace Main B D Module Screen...

Page 25: ...ure each output voltage of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check ST BY 7 8V Replace Power B D N Y Normal voltage Replace Power B D Y A9 A10 A11 A10 A11 A10 A11 Standard Repair Process Established date Revised date Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2020 LG Electronics Inc All rights reserved Only for training an...

Page 26: ... Abnormal If Power Off mode is not displayed Check Power B D output voltage Y N Replace Main B D Normal voltage Replace Power B D Replace Power B D N Y Normal End Caution Check and fix exterior of Power B D Part A12 A10 A11 Established date Revised date Error symptom Standard Repair Process 7 Abnormal 1 B Power error Copyright 2020 LG Electronics Inc All rights reserved Only for training and servi...

Page 27: ...Check fail after multi power on Check Change Power B D CPUABNORMAL If the CPU attempts to reset in case of abnormal operation and Shut Down in case of failure Check Change Main B D NO POLING Power off when receiving no ack RESULT TV power off on Reboot CONDITION There is no I2C response from CPU for 15 seconds Check Change Main B D CPUCMD Power off by main SoC command Check Change Main B D BDP_ERR...

Page 28: ...Normal voltage Y N Replace Power Board or repair parts Check Speaker cable connection N Y Connect Speaker cable Replace Main B D End C Audio error No audio Normal video A13 A14 A10 A11 Disconnection Established date Revised date Error symptom Standard Repair Process 9 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 29: ...ect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 20V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Establis...

Page 30: ...Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V on Main B D A15 Normal Voltage Close N N Check 7 8V on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A10 A11 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A15 Replace Main B D Y A15 Standard Repair Process Established date Revised date Error sy...

Page 31: ...essage N N N Y Replace Magic remote control Turn off on the set and press the wheel Press the back key about 5sec If you conduct the loop at 3times change Magic remote control Y Check the Instart menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Download the Firmware Instart Memu 12 RF Remote control Test Receiver Firmware Download Y RF Receiver ver is 00 00 N A16 A4 A4 Close Close...

Page 32: ...ection N Check the Wi Fi wafer pin Standard Repair Process Established date Revised date Error symptom 13 Replace the Wi Fi assy Normal Voltage Y Y N Replace Main B D Wi Fi MAC is NG N A16 A4 A4 A16 Close Close D Function error Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 33: ...and fix external device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information External device recognition error Established date Revised date Error symptom Standard Repair Process 14 D Function error Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ...proceed as shown in the solution manual For models without any fix information provide the description Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part related to nose in the Owner s Manual E Noise Circuit noise Mechanical noise Established date Revised date Error s...

Page 35: ...lace cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date Error symptom Standard Repair Process 16 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...on diagram A6 7 A Video error_ Color error Check Link Cable Vx1 reconnection condition A7 8 Appendix Defected Type caused by Cable Main Board Module Example of Symptom Image error A 1 10 Example of Symptom Image error A 2 10 Example of Symptom Main A 3 10 Example of Symptom Main A 4 10 Example of Symptom Main A 5 10 Example of Symptom Module A 6 10 Example of Symptom Module A 7 10 Example of Sympt...

Page 37: ...hecking method A12 12 C Audio error_ No audio Normal video Checking method in menu when there is no audio A13 13 Voltage and speaker checking method when there is no audio A14 14 D Function error Remote control operation checking method A15 15 Wi Fi Motion Remote operation checking method A16 16 E Etc How to use the Service remote control A17 A19 17 Check items after Main B D replacement A20 Copyr...

Page 38: ...eck BDP Point A Video error_No video Normal audio A1 Check a voltage of R7624 Red after turn on the TV If the voltage is low Vx1 is locked OK Check a voltage of R7632 Blue after turn on the TV If the voltage is high BDP issue NG Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ... Press ADJ button on Factory Service Remote control 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 A Video error_No video Normal audio Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ... Error symptom Content A3 1 Press MENU button on Factory Service remote control 2 Enter into Manual Tuning menu as below 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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...rsion A4 Established date Revised date Error symptom Content A4 1 Press IN START button on Factory Service remote control 2 Check S W Version A Video error_Video error video lag stop Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...Revised date Error symptom Content A5 Checking method 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: ..._Vertical Horizontal bar Residual image Light spot A6 Established date Revised date Error symptom Content A6 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: ...nnection condition A Video error_Color error A7 Established date Revised date Error symptom Content A7 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: ...n of FFC cable Cable R Color Excessive Color is Excessive due to FFC Cable Contact Cable Screen darkness screen is dark due to poor contact due to disconnection of the FFC cable pin Cable G Color Excessive G color transient due to poor FFC cable connection Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...m Image Cable Color spread Vx1 cable connection problem Cable Color spread Vx1 cable connection problem Cable Color spread Vx1 cable connection problem Cable Screen stop Due to foreign substance withi nLVDS cable PIN Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ...Main Screen noise Broken screen due to Main IC problem Main Dark picture Dark left side screen Main Broken picture Top bottom screen part Picture problem due to tuner Inner side quality problem Appendix Examples of Symptoms Main Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...anner Main Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen Check parts by symptom Appendix Examples of Symptoms Main Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...tage G color spread after 10 minutes Main Right side Screen problem Right side screen problem Main LG logo Screen problem Screen picture spread problem Main Right side picture problem No problem at the initial stage During Heat run right side picture problem Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...le Vertical bar Un repairable Cases In this case please exchange the module Module image broken Source Driver issue Module White dot White dot cause by panel issue Module Line Dim Vertical Line cause by source drive IC Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...e Symptom Image Module Burnt Module burnt Module Horizon line Module has damaged Module Line Defect Module has damaged Module Press damage Un repairable Cases In this case please exchange the module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...urce drive IC Module Vertical Noise Brightness difference Un repairable Cases In this case please exchange the module Module Green light Compensation error when Power On off Module Color difference Color difference between screen cause by compensation error Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...oms Module Item Symptom Name Cause Symptom Image Module No image Module has damaged Can t fix it Module Burnt Burnt Can t fix it Module Mura Screen Mura Can t fix it Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 55: ...Check Power Indicator B Power error _No power A9 Established date Revised date Error symptom Content A9 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 56: ...tent Check power input voltage and ST BY 3 5V A10 B Power error _No power Check 12VM line for ST BY Voltage ST BY status 7 8V Power on DC On status 12V P201 Power To Main B d Power To Module 55 65BX P252 P251 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...ror_Off when on off whiling viewing A12 Established date Revised date Error symptom Content A12 1 Press IN START button on Factory Service remote control 2 Check the entry into 3 Power On Off Status Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ...io Normal video A13 Established date Revised date Error symptom Content A13 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 59: ...t voltage for Audio AMP supplied from Power board If there is no input voltage remove and check the harness 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 Checking order when there is no audio 1 SPK_R _CT 2 SPK_R _FT 3 SPK_R _CT 4 SPK_R _FT 5 SPK_L _CT 6 SPK_L _FT 7 SPK_L _CT 8 SPK_L _FT P201 Cop...

Page 60: ...ed date Error symptom Content A15 1 Check IR cable condition between IR Main board 2 Check 3 5V_ST on pin 4 3 AS checking the Pre Amp of IR B D 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 61: ...thod D Function error A16 Established date Revised date Error symptom Content A16 Checking order 1 Check BT Wifi cable condition between BT Wifi assy Main board 2 Check the 3 5V on the terminal 1 6 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ... How to use the Service remote control E Etc A17 Established date Revised date Error symptom Content A17 0 4 1 3 0 4 1 3 1 How to access the remote control Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 63: ... Aucto Screen 4 3 16 9 PSM Changes in the order of Bright Picture Easy Picture Cinema Spots Game Custom PIcture1 Custom Picture2 Bright Picture SSM Added Function Standard user music cinema sports game standard user PIP Picture In Picture is activated TEXT Access to the Power Only mode CAP Broadcasting caption on off MPX Stereo mode mono stereo foreign language access Used when in factory mode Sim...

Page 64: ...hite Red Green Blue Black Pattern Off Change X STUDIO Added function HDD USB external device s HDD screen is activated MENU User function gets activated EXIT Exit from the current mode TIME SHIFT Added function Moves forward backward of recorded contents MUTE Mute function 0 Volume IN STOP SET to factory mode VOL Volume Up Down CH Channel Up Down AV1 2 3 Added function Connects to external input 1...

Page 65: ... in the model name and serial number after checking the ID label on the back cover 1 Press the Service remote control instart Key 2 Press the Service remote control ADJ Key No 13 Select White Balance 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 E Etc Copyright 2020 LG Electronics Inc All rights reser...

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