LG OLED55CXAUA Page 60 Service Manual Download

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Checking order when there is no audio

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 P5400 to the speaker terminal and if you hear the ‘Chik~ Chik~’

sound when you touch the GND and output terminal, the speaker is normal.

Standard Repair Process Detail Technical Manual

Voltage and speaker checking method
when there is no audio

C. Audio error_No audio/Normal video

A12

Established

date

Revised

date

Error

symptom

Content

A12

①

③

②

Only for training and service purposes.

Summary of Contents for OLED55CXAUA

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 11 EXPLODED VIEW 12 ASSEMBLY DISASSEMBLY GUIDE 13 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: ...SB port 2 Automatically detect the SW Version and show the below message 3 Click YES initiate the download and install of the update 4 Click Check Now move to 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 ...

Page 10: ... update progress go to Menu All Settings General About This TV 4 If you want to cancel update click 1 1 CANCEL UPDATE 5 NO Keep updating Yes Cancel updating Case 2 NOT Allow Automatic Updates Toggle Item 1 Menu All Settings General About This TV 2 TV will automatically check for updates when every TV boots When an updated is detected the TV will issue an Alert letting the user know that an update ...

Page 11: ...2 0 OPTIC LAN LPDDR4 8Gb x32 HDMI1 2 1 HDMI2 2 1 HDMI3 2 1 SYSTEM EEPROM USB2 2 0 USB3 2 0 eMMC 8GB Internal Micom P_TS X_TAL 50MHz I2S Out S I D E S I D E SPDIF OUT BLUTOOTH IR KEY EYE WIFI SUB ASSY CVBS SIF Tuner ARC eARC OCP 1 5A OCP 1 5A HDMI4 2 1 DDR Controller 64bit LPDDR4 16Gb x32 RS232C RS232C Control AV CVBS AV CVBS 0 8V_CORE_DCDC ...

Page 12: ...ese 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 SAFETY NOTICE 200 400 540 800 810 530 HR1 HP1 811 811 121 HS1 AR2 A10 700 910 900 920 120 500 501 570 HW1 LV1 L...

Page 13: ...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 14: ...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 15: ...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 17: ...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 20: ...uto on off 7 8 Off when on off while viewing power auto on off 8 9 C Audio error No audio Normal video 9 10 Wrecked audio discontinuation noise 10 11 D Function error Remote control Local switch checking 11 12 MR20 operating checking 12 13 Wifi operating checking 13 14 External device recognition error 14 15 E Noise Circuit noise mechanical noise 15 16 F Exterior error Exterior defect 16 First of ...

Page 21: ...ts End Always 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 Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS or EPI Cable Speak...

Page 22: ...io 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 A18 Established date Revised date Error symptom 2 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 23: ...ain B D Normal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced 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 Er...

Page 24: ...or Check external device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con 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 A8 A7 Standard Repair Process Established date Revised date Error symptom 4 Copyright 2020 LG Electronics Inc All rig...

Page 25: ... by connecting Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error 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 T con B...

Page 26: ...oltage 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 Main ST BY 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A17 A18 A18 A18 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 and servic...

Page 27: ...place 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 A19 A18 Established date Revised date Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purp...

Page 28: ...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_ERR...

Page 29: ...ce Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 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 30: ...xternal 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 ...

Page 31: ...m Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 Normal Voltage 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 A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A22 Replace Main B D Y A22 Standard Repair Process Established date Revised date Error symptom 11...

Page 32: ...ir Process Established date Revised date Error symptom 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 Replace MR20 Y RF Receiver ver is 00 00 N A23 A4 A4 12 Close Close Normal operating Close Copyright 2020 LG Electronics Inc Al...

Page 33: ...r Wifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date Error symptom 13 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A24 A4 A4 A24 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ... Check and 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 Error symptom Standard Repair Process 14 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ...ceed 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 symp...

Page 36: ...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 37: ...5 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 6 A Video error_ Color error Check Link Cable Vx1 EPI reconnection condition A7 7 Appendix Defected Type caused by T Con Inverter Module Check Cable 1 2 A 1 11 A 2 11 Exchange Main Board 1 3 A 3 11 A 5 11 Exchange Module 1 3 A 6 11 A 8 11 Exchange T Con 1 2 A 9 11 A 10 11 Exchange Power Board PSU A 11 11 Conti...

Page 38: ...Audio error_ No audio Normal video Checking method in menu when there is no audio A11 12 Voltage and speaker checking method when there is no audio A12 13 D Function error Remote control operation checking method A13 14 Motion Remote operation checking method A14 15 E Etc How to use the Service remote control A15 A17 16 Check items after Main B D replacement A18 Continued from previous page Copyri...

Page 39: ...r_No video Normal audio A2 Entry method 1 Press the ADJ button on the remote control for adjustment 2 Enter into White Balance 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 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...tor 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop A3 Established date Revised date Error symptom Content A3 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...o error video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version A4 Established date Revised date Error symptom Content A4 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...easuring each voltage from power supply finally replace the MAIN BOARD Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop A5 Established date Revised date Error symptom Content A5 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ..._Vertical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content A6 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...connection condition A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 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: ...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 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: ...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 50: ...the screen MODULE Internal matter BLU internal foreign matter inflow MODULE Image broken 6 block image broken MODULE Image broken Screen sync signal broken A 6 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...ng due to lateral external impact and internal bending of BLU MODULE Vertical smear Vertical spreading on cube screen in no signal MODULE Over color Screen contour part brightly Over color A 7 11 Check parts by symptom Appendix Examples of Symptoms Module Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...nter of the screen 1 block dark MODULE Vertical bar Center Vertical Bar MODULE Darkness at the bottom of the screen MODULE internal BLU breakage A 8 11 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: ...d the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken T CON screen lower image broken T Con is defective and the picture below the screen is broken A 9 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...f the screen Initial normal operation upper darkness during heat run T CON Image Broken The entire screen is dark and bit noise occurs T CON Image Broken The entire screen is dark and bit noise occurs A 10 11 Check parts by symptom Appendix Examples of Symptoms T Con Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 56: ...Detail Technical Manual Check front Power Indicator B Power error _No power A8 Established date Revised date Error symptom Content A8 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 57: ...ck P201 SET On above 3V SET St by 0V 3 12V Level Check P201 SET On 12V SET St by 7 8V swing between 7V to 10V 4 DRV_ON Check P201 SET On above 2 5V SET St by 0V 5 T CON 23V Check P251 P252 SET On above 23V SET St by 0V 6 T CON 12V Check P202 SET On above 12V SET St by 0V Power Board Voltage Current All condition meets Power Board OK A9 Copyright 2020 LG Electronics Inc All rights reserved Only for...

Page 58: ...to adjustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing A10 Established date Revised date Error symptom Content A10 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ...und Out 4 Select TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A11 Established date Revised date Error symptom Content A11 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 60: ... tester P5400 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video A12 Established date Revised date Error symptom Content A12 Copyright 2020 LG Electronics Inc All rights reserved Only...

Page 61: ... is in ON condition an Analog Tester needle should move slowly otherwise it s defective Standard Repair Process Detail Technical Manual Remote control operation checking method D Function error A13 Established date Revised date Error symptom Content A13 Checking order to check remote control Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 62: ...blished date Revised date Error symptom Content A14 Checking order 1 Check BT Wifi cable condition between BT Wifi assy Main board 2 Check the Main 3 5V on the terminal 1 pin Checking order to check motion remote wifi A14 Copyright 2020 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 63: ...to use the Service remote control D Function error A15 Established date Revised date Error symptom Content A15 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 64: ...Cinema Zoom 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 facto...

Page 65: ...attern Off White 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 exte...

Page 66: ...r D L Key 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 Copyright 2020 LG Electronics Inc All rights re...

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