LG OLED55BX Series Page 62 Service Manual Download

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Voltage and speaker checking method
when there is no audio

C. Audio error_No audio/Normal video

Error symptom

Content

②

①

Check the contact condition of or 20V connector of Main Board.

②

Measure the 20V input voltage supplied from Power Board.

(If there is no input voltage, remove and check the connector.)

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

Established

date

Revised

date

Only for training and service purposes.

Summary of Contents for OLED55BX Series

Page 1: ...e purposes 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 limitati...

Page 2: ...ts reserved Only training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 11 BLOCK DIAGRAM 12 EXPLODED VIEW 13 ASSEMBLY DISASSEMBLY GUIDE 14 TROUBLE SHOOTING GUIDE APPENDIX ...

Page 3: ... 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 an...

Page 4: ...arge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing wrist strap device which should be removed to prevent potential 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 electrostatic ...

Page 5: ...ts 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 an...

Page 6: ...a Middle East 2 Broadcasting system 1 Digital TV DVB T T2 DVB C DVB S S2 2 Analogue TV PAL B B PAL B G PAL D K PAL I SECAM B G SECAM D K NTSC M Depending on country 3 Program coverage 1 Digital TV DVB T DVB T2 VHF III 174 230 MHz UHF IV 470 606 MHz UHF V 606 862 MHz S Band II 230 300 MHz S Band III 300 470 MHz DVB S S2 950 2150 MHz DVB C 46 890 MHz 2 Analogue TV 46 862 MHz Only DVB T2 C S2 support...

Page 7: ...mponent Input Y Pb Pr Depending on country 7 HDMI Input HDMI 1 PC DTV Format Support HDMI2 1 HDMI 2 PC DTV Format Support HDMI2 1 HDMI 3 PC DTV Format Support HDMI2 1 HDMI 4 PC DTV Format Support HDMI2 1 8 Video Input RCA PAL SECAM NTSC 4 System PAL SECAM NTSC PAL60 9 Audio Input DVI Audio 10 SPDIF out 1EA Optical Audio out 11 USB Input 3EA EMF For SVC download 12 Ethernet Connect 1EA Optical Audi...

Page 8: ...0 00 148 50 HDTV 1080P No Resolution H freq kHz V freq kHz Pixel clock MHz Proposed Remarks 1 640 480 31 46 59 94 25 12 SDTV 480P 2 640 480 31 5 60 25 12 SDTV 480P 3 720 480 31 47 59 94 27 SDTV 480P 4 720 480 31 5 60 27 02 SDTV 480P 5 720 576 31 25 50 27 SDTV 576P 6 1280 720 44 96 59 94 74 17 HDTV 720P 7 1280 720 45 60 74 25 HDTV 720P 8 1280 720 37 5 50 74 25 HDTV 720P 9 1920 1080 28 12 50 74 25 H...

Page 9: ...8 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 35 4096 2160 56 25 25 297 UDTV 2160P 36 4096 2160 61 43 29 97 296 7 UDTV 2160P 37 4096 2160 67 5 30 297 UDTV 2160P 38 4096 2160 112 5 50 594 UDTV 2160P 39 4096 2160 134 86 59 94 593 4 UDTV 2160P 40 4096 2160 135 60 594 UDTV 2160P 41 4096 2160 225 100 1188 UDTV 2160P 4K120 model K6Hp HDMI 3 ...

Page 10: ...2160P 12 3840 2160 53 95 23 98 296 7 UDTV 2160P 13 3840 2160 54 24 297 UDTV 2160P 14 3840 2160 56 25 25 297 UDTV 2160P 15 3840 2160 61 43 29 97 296 7 UDTV 2160P 16 3840 2160 67 5 30 297 UDTV 2160P 17 3840 2160 112 5 50 594 UDTV 2160P 18 3840 2160 134 86 59 94 593 4 UDTV 2160P 19 3840 2160 135 60 594 UDTV 2160P 20 4096 2160 53 95 23 98 296 7 UDTV 2160P 21 4096 2160 54 24 297 UDTV 2160P 22 4096 2160...

Page 11: ...e 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 DOWNLOAD 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 After finish...

Page 12: ...EPI block IQ IP HDMI4 2 1 TS K6Hp DDR4 2666 x8 2EA x16 2EA 512MB X 4EA EPI CEDS 68P 68P Vx1 41P 51P Area OPT IR KEY MIC 1 2V DDR 0 95V Core CPU LDO 2A 1 0V Eth 3 5V ST_BY 1 8V 5V Normal Sub PMIC 0 95V 1 2V_DDR 2 5V_DDR4_VPP 5V 1V 1 8V 3 5V_ST 0 95V 1 5V 3 3V 13V 3 3V 5V 5V 1V 1 8V 1 8V 3 5V_ST 3 5V_ST 3 3V 3 5V_ST 3 5V_ST 13V 3 5V_ST 3 5V_ST 3 5V_ST 13V 3 3V 13V 13V 3 3V 13V PANEL_VCC 13V PANEL_VC...

Page 13: ...ODED VIEW Many electrical and mechanical parts in this chassis have special safety related characteristics These parts 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 SA...

Page 14: ...ronics Inc All rights reserved Only training and service purposes ASSEMBLY DISASSEMBLY GUIDE 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 1 1 1 ...

Page 15: ...Electronics Inc All rights reserved Only training and service purposes 2 Remove screw 4 EA disassemble stand from back cover 3 Remove screw 1 EA disassemble power cord from back cover 1 Screw 1 EA 1 Screw 4 EA 1 1 1 1 1 ...

Page 16: ...ing and service purposes 4 Remove screw 4 EA disassemble back cover from module Put hand on the marked area O separate the back cover to the top 5 Remove screw 1 EA disassemble Wifi Jog assy 1 1 1 1 2 2 2 2 2 2 2 2 2 Screw 4 EA Latch 12 EA 1 2 2 2 2 1 Screw 1 EA 1 ...

Page 17: ... 17 Copyright LG Electronics Inc All rights reserved Only training and service purposes 6 Remove the latch 2 EA disassemble IR assy 7 Remove all sort of cable 2 Latch 2 EA 2 2 Slide ...

Page 18: ... 18 Copyright LG Electronics Inc All rights reserved Only training and service purposes 8 Disassemble speaker 9 Remove screw 12 EA disassemble Main PCB and PSU 1 1 1 1 1 1 1 1 1 1 1 1 Screw 12 EA 1 ...

Page 19: ...ctronics Inc All rights reserved Only training and service purposes 10 Remove screw 7 EA disassemble stand guide and stand fixer 11 Remove screw 4 EA disassemble VESA Bracket 1 1 1 1 Screw 4 EA 1 1 1 1 1 1 Screw 7 EA 1 1 1 ...

Page 21: ...off while 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 MR20 operating checking 12 12 Wifi 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 there is...

Page 22: ...ways check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 16 Error symptom A Video error No video Normal audio A9 A9 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 D C...

Page 23: ...audio Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A9 Established date Revised date 2 16 Error symptom 2 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 24: ...al level meter By using Diagnostics menu on OSD All Settings Channels Channel Tuning Manual Tuning Check the Signal 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 3 16 Error symptom 3 N Y Close N S W Upgrade SVC Bulletin Norm...

Page 25: ...ck 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 A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A15 A7 Standard Repair Process Established date Revised date 4 16 Error symptom 4 Copyright 2020 LG Electronics Inc All rights reserved...

Page 26: ...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 HDMI DVI Request repair for external device HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main B D Module Scre...

Page 27: ...sure voltage of each output 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 Normal voltage Replace Power B D Y A8 A9 A9 A9 Standard Repair Process Established date Revised date 6 16 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2020 LG Electronics Inc All rights reserved Only for training and servic...

Page 28: ...ace Main B D CPU Abnormal If Power Off mode is not displayed Check Power B D 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 A10 A9 Established date Revised date 7 16 Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service pu...

Page 29: ...gh 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 INV_...

Page 30: ...Power Board and repair parts Check Speaker disconnection N Y connecting Speaker Replace MAIN Board End C Audio error No audio Normal video A11 A12 A9 Disconnection Established date Revised date 9 16 Error symptom Standard Repair Process 9 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 31: ...ernal Input Connect 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 ...

Page 32: ...heck Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A13 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 A9 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A13 Replace Main B D Y A13 Standard Repair Process Established date Revised date 11 16 Error sy...

Page 33: ...Is show ok message N N N Y Replace MR20 Turn off on the set and press the wheel Press the back key about 5sec If you conduct the loop at 3times change the MR20 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 12 RF Remote control Test Receiver Firmware download Y RF Receiver ver is 00 00 N A14 A4 A4 Close Close Close Close 12...

Page 34: ...ifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 13 16 Error symptom 13 Change the Wifi assy Normal Voltage Y Y N Replace Main B D Wi Fi Mac value is NG N A14 A4 A4 A14 Close Close Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ... fix external device cable HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 13 15 Error symptom Standard Repair Process 14 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...d 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 15 16 Error s...

Page 37: ...e cabinet Replace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 16 16 Error symptom Standard Repair Process 16 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ... Tuner Checking Part A5 6 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 7 A Video error_ Color error Check Link Cable Vx1 reconnection condition A7 8 Adjustment Test pattern ADJ Key A15 9 Appendix Defected Type caused by T Con Power Module Exchange Main Board 1 A 1 5 Exchange Main Board 2 A 2 5 Exchange Power Board PSU A 3 5 Exchange Module 1 A 4 5 Exchange...

Page 39: ...A10 13 C Audio error_ No audio Normal video Checking method in menu when there is no audio A11 14 Voltage and speaker checking method when there is no audio A12 15 D Function error Remote control operation checking method A13 16 Motion Remote operation checking method A14 17 Wifi operation checking method A14 18 E Etc How to use the Service remote control A15 A17 19 Check items after Main B D repl...

Page 40: ... Check a voltage of R7624 Red after turn on the TV If the voltage is low Vx1 is locked OK Refer Burnt Detect Check Point In the state of TV on Check the voltage of R7632 Blue Low 0V Normal High 3 3V Burnt Detect Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...ecording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Error symptom Content A Video error_No video Normal audio Check White Balance value Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ... video lag stop Content Established date Revised date All Settings Programmes Programme Tuning setting Manual Tuning Antenna DTV 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 43: ...ymptom A Video error_Video error video lag stop Content Press the IN START with the remote control for adjustment OLED TV Version checking method Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...xternal device is connected 2 After measuring each voltage from power supply finally replace the MAIN BOARD Error symptom A Video error_Video error video lag stop Content Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...Revised date Error symptom Content OLED TV Connection diagram A Video error _Vertical Horizontal bar residual image light spot Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...onnection condition A Video error_Color error Established date Revised 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 47: ...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 48: ...ead LVDS cable connection problem CABLE Color spread LVDS cable connection problem CABLE Screen stop Due to foreign substance withi nLVDS cable PIN Appendix Examples of Symptoms Image error Check for poor cable contact Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...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 50: ...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 51: ...n 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 Check parts by symptom Appendix Examples of Symptoms Main Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...ange 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 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...e Module has damaged Module Line Defect Module has damaged Module Press damage Un repairable Cases In this case please exchange the module Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ... 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 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 55: ...mage Module has damaged Can t fix it Module Burnt Burnt Can t fix it Module Mura Screen Mura Can t fix it Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...Check front Power Indicator B Power error _No power Error symptom Content Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ... 3 5V B Power error _No power Error symptom Content Established date Revised date Check the DC 12VT line for ST BY Voltage ST BY 7 8V Normal 12V Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ... ST BY Voltage ST BY 7 8V Normal 12V Check power input voltage and ST BY 3 5V B Power error _No power Error symptom Content Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 60: ...E checking method Established date Revised date 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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 61: ...2 Select the Sound function of the Menu 3 Select the Sound Out 4 Select TV Speaker Checking method in menu when there is no audio C Audio error_No audio Normal video Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ...voltage supplied from Power Board If there is no input voltage remove and check the connector 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 Established date Revised date Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purpos...

Page 63: ... light the power is in ON condition an Analog Tester needle should move slowly otherwise it s defective Remote control operation checking method D Function error Established date Revised date Error symptom Content Checking order to check remote control Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 64: ...D light the power is in ON condition an Analog Tester needle should move slowly otherwise it s defective Checking order to check remote control Remote control operation checking method D Function error Established date Revised date Error symptom Content Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 65: ...ssy Main board 2 Terminal Pin 1 Pin 6 Pin12 Check 3 5V Power No Motion Remote operation checking method D Function error Established date Revised date Error symptom Content Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 66: ...How to use the Service remote control Error symptom Content Established date Revised date E Etc Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 67: ...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 Simplink Added Function Access to the Simplin...

Page 68: ...ttern 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 2 3 COMP1 2 Added function ...

Page 69: ...ntent How to use the Service remote control Established date Revised date Check items afer Main B D Model Number D L White Balance Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

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