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LG 70UM7350PUA, Service Manual

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LG 70UM7350PUA Service Manual Download Page 72

Check parts by symptom 

A - 3/11 

Item 

Symptom 

Name 

Cause 

Symptom Image 

Main 

Screen noise 

Bit noise from horizontal screen 

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 © 2019 LG Electronics Inc. All rights reserved. 

Only for training and service purposes.

Summary of Contents for 70UM7350PUA

Page 1: ...il facsimile or other electronic means publication modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes without limitation any text graphics or logos in this Service Manual Copyright 2019 LG Elect...

Page 2: ...hts reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 10 BLOCK DIAGRAM 12 EXPLODED VIEW 13 ASSEMBLY DISASSEMBLY 14 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: ...t be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 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 D...

Page 7: ...0 297 UDTV 2160P 14 3840 2160 112 5 50 594 UDTV 2160P 15 3840 2160 135 60 594 UDTV 2160P 16 3840 2160 225 100 1188 UDTV 2160P 17 3840 2160 270 120 1188 UDTV 2160P 18 4096 2160 53 95 23 97 296 7 UDTV 2160P 19 4096 2160 54 24 297 UDTV 2160P 20 4096 2160 56 25 25 297 UDTV 2160P 21 4096 2160 67 5 30 297 UDTV 2160P 22 4096 2160 112 5 50 594 UDTV 2160P 23 4096 2160 135 60 594 UDTV 2160P 24 4096 2160 225...

Page 8: ...80P 16 1920 1080 27 24 63 36 HDTV 1080P 17 1920 1080 33 71 29 97 79 12 HDTV 1080P 18 1920 1080 33 75 30 79 2 HDTV 1080P 19 1920 1080 56 25 50 148 5 HDTV 1080P 20 1920 1080 67 43 59 94 148 35 HDTV 1080P 21 1920 1080 67 5 60 148 5 HDTV 1080P 22 1920 1080 112 5 100 297 HDTV 1080P 23 1920 1080 134 86 119 88 296 7 HDTV 1080P 24 1920 1080 135 120 297 HDTV 1080P 25 3840 2160 53 95 23 98 296 7 UDTV 2160P ...

Page 9: ... 43 4096 2160 225 100 1188 UDTV 2160P 44 4096 2160 270 120 1188 UDTV 2160P 45 2560 1440 88 78 60 241 5 3K non standard 46 2560 1440 183 120 497 7 3K non standard 47 7680 4320 107 89 23 98 1188 8K 8K Model Only 48 7680 4320 108 24 1188 8K 8K Model Only 49 7680 4320 110 25 1188 8K 8K Model Only 50 7680 4320 131 87 29 97 1188 8K 8K Model Only 51 7680 4320 132 30 1188 8K 8K Model Only 52 7680 4320 220...

Page 10: ...t 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 automatically 8 After TV turned on Check the updated SW Version and Tool Option ...

Page 11: ...Function is needed to connect to the internet 1 Menu All Settings General About This TV 2 Click CHEK FOR UPDATES system check newest version 3 Click DOWNLOAD AND INSTALL 4 TV is updating 5 After finished the update below Pop up appear 6 Turn OFF the TV and On Check the updated SW Version and Tool Option ...

Page 12: ... 51P 8 lane Vx1 EPI CEDS FCIC SPI I2C 6 Main PMIC M0 M1 IF CVBS SIF GST MCLK GCLK EO I2C 6 NVRAM 256Kb I2C_1 I2C 2 EPI block HDMI4 TS DDR3 2133 X 32 256MB X 2EA DDR3 2133 X 32 512MB X 2EA N A EPI 60P 65 8 lane 55 6 lane CEDS 68P Area OPT USB_WIFI I2C_SDA_1 1 5V DDR 0 95V Core CPU 3 3V Normal 1 0V Eth 3 5V ST_BY 1 8V 5V Normal Sub PMIC 0 95V 1 5V 3 3V 5V 1V 1 8V 3 5V_ST 0 95V 1 5V 3 3V 3 3V 5V 1V 1...

Page 13: ...hese 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 400 540 200 LV1 521 570 530 HP1 HS1 HW1 901 120 411 500 200A 902 820 812 811 Stand Screw AR2 A10...

Page 14: ... All rights reserved Only for training and service purposes 1 70UM73_1pole 2pole Set B C Guide 1 1 Allowed to handle 1 2 Prohibited while handling ASSEMBLY GUIDE ASSEMBLY GUIDE Guide line DO NOT handle the area all the time Guide line ...

Page 15: ...d 1 Unfasten screw on specified points A B 2 Twist 2pole stand to separate A B Image Type 1pole 2pole x4 x6 2 3 1pole Lift up the rear cover while pulling down to bottom side 2pole Lift up the rear cover using stuffs like paddle or cards to insert between rear cover and rear cover bottom 1 Unfasten screw on each points 1pole 2pole Common 1pole 2pole x9 x6 Remark Working guide Image Type ...

Page 16: ...orter x4 1pole 2pole x4 Remark Working guide Image Type 4 5 1 Workers should hold each side as below Common Common 1 Unfasten screw on each points 2 Disassemble speaker cable 3 Unfix the latch before disassembling rear cover bottom x4 SHOULD check handling guide on first page Remark Working guide Image Type use tools pen or screw driver etc to push the latch ...

Page 17: ...ole supporter x4 1pole 2pole x4 Remark Working guide Image Type 2 3 Common Common 1 Check each side of latch on rear cover bottom which has been inserted correctly before assembling B C 2 Fasten screws on each points 3 Hang speaker cable as below x4 Remark Working guide Image Type 1 Workers should hold each side as below SHOULD check handling guide on first page ...

Page 18: ...NLY Press specified points NG Overlaps with case top OK B C has been inserted 1 Press each side of B C to avoid overlap with case top before fixing screws You can fix the screws with pushing B C when it does not inserts in case top due to tension Remark Working guide Image Type 6 7 1 Fasten screws on each points Common 1pole x9 x6 1 Assemble 1pole stand 2 Fasten screws on each points x4 1 2 Remark...

Page 19: ... 19 Copyright LG Electronics Inc All rights reserved Only for training and service purposes 1 Assemble 2pole stand A B 2 Fasten screws on each points A B 2pole x6 8 Remark Working guide Image Type ...

Page 20: ...upported 2 Disassemble 8 SPCB Cover shield L R screws Use M3 Screw Module Driver TIP T Con and FFC Cable FFC Fixed Tape need not be disassembled T Con FFC Fixed Tape FFC Cable 3 Disassemble the screw and then move each SPCB cover field L R upward to disassemble it Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 21: ...nnector 5 Loosen the case top tightening screw Case Top Back 3 sided Screw Spec M3 6 0mm Tapping Screw Silver Location Up 11ea Left 6ea Right 6ea Driver Normal size screw TIP Driver is available Back side Screw point Up Left Right LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 22: ...iver is available 7 Disassemble 4 EMI Tapes of the Panel SPCB Remove parts attached to the cover Bottom by hand no need to be removed up to the panel SPCB attachment surface LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 23: ...the bottom side of the hook of the holder 1 2 9 Reverse LCM Must be worked more than two people one on the left and one on the right side with both hands reverse 180 degrees Lift the lower SPCB upwards Reverse Product Upper Side Use as Support LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 24: ...stened to the Guide Panel by using the flathead Driver Insert Flathead Driver Section of C Top Hook C Top Hook Up 10ea Left 3ea Right 3ea Total 16ea LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 25: ...eased by hand 12 Disassemble C Top After releasing the 4 sided Hook remove the C Top by lifting it upwards Precautions Must be worked more than 2 people Be careful of damage to the Case Top due to large size LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 26: ...t counterclockwise to lift it up as shown below Panel disassemble from BLU in vertical position 14 Disassemble Guide Panel After releasing the upper lower left right side hook lift the guide panel upwards to disassemble Precautions Must be worked more than 2 people Be careful of damage to the Guide Panel due to large size BLU Panel SPCB A point of support Case without Panel vacuums Up 12ea Down 12...

Page 27: ...he Sheets Diffuser Plate on the front left side of SET other than that the corners are rectangular SET Front Position Upper Sheet Chamfer shape Lower Sheet Round shape Diffuser Plate Chamfer shape the upper left Sheet 2ea Diffuser Plate1ea LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 28: ...and lift it upwards to disassemble Total 14ea 17 Disassembly of 5 Support Pins Invert the LCM and disassemble the upper Support Pin Hook at the rear of the LCM using the tool Long nose plier Backside LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 29: ...g part of the wire connector at the same time and lift it up and release it Total 5ea Locking 20 Disassemble the Led Array and Attach the New Led Array Disassemble the Led Array Bar Led Array and Cover Bottom are fixed with two sided tape so use appropriate force to cover the Led Array Take it off and attach a new Led Array LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All...

Page 30: ... the cover Bottom Sheet hanging 23 Position the Reflector sheet Align the reflector with the reflector guide hole at two locations on the center bottom of the reflector and assemble two support plates first Support DP assembly Center Up Down Reflector Assemble Align Guide Hole Support Plate Assemble Only 2 sites first LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All right...

Page 31: ...to tighten when using nails 1 2 2 3 3 Using tools Using nails 25 Assembly of 14 Support Diffuser Plates Insert the Support DP into the Support DP Hole on the Cover Bottom and rotate it clockwise 45 degrees total 14ea After assembly the Support DP is vertical Position to the LCM 26 Support Pins Assembly Press the Support Pin with your hand down to fix it to the Cover Bottom Total 5ea LED Array Asse...

Page 32: ...ea Diffuser Plate1ea Precautions Check that the sheet hanging hole on the upper lower left right outer is properly seated on the cover Bottom Sheet hanging OK NO Up 8ea Down 6ea Left 5ea Right 5ea LED Array Assembly Disassembly Guide Lower Sheet Round shape Diffuser Plate Chamfer shape the upper left Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 33: ...7ea Precautions In case of gap between guide panel and sheet Recheck Hook Tightening OK NO 1 2 3 1 1 1 1 2 1 When assembling the lower part of the LCM 3 2 there is a Rib on the underside of the guide panel to tighten it As this may be relatively difficult assemble as follows 3 2 G Panel Forcing Force on Lower Side Direction Down Line 3 2 LED Array Assembly Disassembly Guide Copyright 2019 LG Elect...

Page 34: ...U in a clockwise direction BLU Panel SPCB A point of support Case without Panel vacuums BLU Panel SPCB A point of support Precautions When the panel is seated the guide panel should not be lifted onto the PG section Panel damage occurs when assembling the case top while the panel is mounted on top of the PG Guide Panel PG Guide Panel PG LED Array Assembly Disassembly Guide Copyright 2019 LG Electr...

Page 35: ...ner and then press the top down to tighten the hook Precautions Must be worked more than 2 people Be careful of damage to the Case Top due to large size C Top Hook Up 10ea Left 3ea Right 3ea Total 16ea C Top Hook Down 8ea LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...ten the SPCB 2 32 Reverse LCM Must be worked more than 2 people one on the left and one on the right side with both hands reverse 180 degrees Lift the lower SPCB upwards Reverse Product Upper Side Use as Support 1 LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 37: ...crew Module Driver available 35 Assemble 4 Panel SPCB EMI Tapes Press EMI Tape attached to Panel SPCB side on Cover Bottom and attach it by hand LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...hten Case Top Screw Case Top Back 3 sided Screw Spec M3 6 0mm Tapping Screw Silver Location Up 11ea Left 6ea Right 6ea Driver Normal size screw TIP Driver is available Backside Screw point 상 좌 우 Check the FFC Cable insert status so that the 2 line is not visible LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ...wards in an upward direction pre assemble to Cover Bottom s Guide Embo when seated Precautions Cover Shield flange must be inserted between C Top and BLU do not protrude into C Top outer LED Array Assembly Disassembly Guide Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...TROUBLE SHOOTING GUIDE Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...Main PCB SIZE 165X174 1 Main processor K5Lp 2 eMMC 3 EEPROM 4 Audio AMP 1 2 4 3 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...Main PCB Assy Power Module PANEL SPEAKER P5800 P1000 P7600 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...Interconnection 1 2 1 2 3 PCBs Main PCB PSU Module FFC 70UM73 71 3 75UM75 1 2 3 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...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 MR19 operating checking 12 Wifi operating checking 13 12 External device recognition error 14 13 14 E Noise Circuit noise mechanical noise 15 15 F Exterior error Exterior defect 16 First of all Check whether there is...

Page 45: ...arts 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 Spe...

Page 46: ...dio 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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ... Main B D Check Tuner soldering 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 Establis...

Page 48: ...r 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 A29 A7 Standard Repair Process Established date Revised date Error symptom 4 Copyright 2019 LG Electronics Inc All rig...

Page 49: ...I 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 ...

Page 50: ...e 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 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 2019 LG Electronics Inc All rights reserved Only for training and service ...

Page 51: ...2 phase out Check A C cord Check for all 2 phase power out Check outlet Replace Main B D CPU Abnormal Replace Power B D N Y Normal End Established date Revised date Error symptom Standard Repair Process 7 Abnormal 1 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...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 53: ...ace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A21 A22 A18 Disconnection Established date Revised date Error symptom Standard Repair Process 9 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...ternal 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 13 2V Replace Main B D In case of External Input signal error Check and fix external device Replace Main...

Page 55: ...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 Close N N Check 3 5v 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 A23 Replace Main B D Y A22 Standard Repair Process Established date Revised date Error symp...

Page 56: ...dard Repair Process Established date Revised date Error symptom Replace MR19 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the M4 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Change the RF Receiver assy Y RF Receiver ver is 00 00 N Close A24 A4 A4 12 Copyright 2019 LG Electronics Inc All...

Page 57: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 58: ... 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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 59: ...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 60: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 61: ...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 EPI reconnection condition A7 8 Appendix Defected Type caused by T Con Inverter Module Check Cable 1 2 A 1 11 A 2 11 9 Exchange Main Board 1 3 A 3 11 A 5 11 10 Exchange Module 1 3 A 6 11 A 8 11 11 Exchange T Con 1 2 A 9 11 A 10 11 Only using T con model 12 E...

Page 62: ... menu when there is no audio A21 17 Voltage and speaker checking method when there is no audio A22 18 D Function error Remote control operation checking method A23 19 Motion Remote operation checking method A24 20 E Etc How to use the Service remote control A25 A27 21 Check items after Main B D replacement A28 22 Adjustment Test pattern ADJ Key A29 23 How to use JIG Power B D Diganostic Smart Jig ...

Page 63: ... Content Check LCD back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from locations A1 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 64: ...ideo Normal audio A2 ALL MODELS 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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 65: ...B 20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content A3 All Settings Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 66: ...or video lag stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content A4 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 67: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 68: ...ical 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 ALL MODELS Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 69: ...nnection 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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 70: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 71: ...lor spread FFC connection problem CABLE Color spread FFC connection problem CABLE Screen stop Due to foreign substance within FFC PIN Appendix Examples of Symptoms Image error Check for poor cable contact Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 72: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 73: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 74: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 75: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 76: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 77: ...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 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 78: ...ure 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 Only if using T con Board Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 79: ...en 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 Only if using T con Board Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 80: ...Appendix Exchange Power Board PSU No Light No picture Sound Ok A 11 11 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 81: ...k front Power Indicator B Power error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Power ON condition Turn Off Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 82: ...R ON Check SET On above 3V SET St by 0V 3 13 2V DC Check SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 7 Home mode General Customer Store mode use Store Picture Condition VIVID Back light 100 Min Max 273 6V 334 4V all condition meets Power Board OK SK100 AC input P801 P201 Established date Revised date A18 Error symptom Content Check power input voltage and ST BY 7...

Page 83: ...ove 3V SET St by 0V 3 13 2V DC Check SET On 13 2V SET St by 7 8V 4 MS Level Check MS 5 LED voltage Check P801 Pin 1 3 5 7 Home mode General Customer Store mode use Store all condition meets Power Board OK SK100 AC input P801 P201 Picture Condition VIVID Back light 100 전압 Min Max LED 1 183 6 224 4 LED 2 123 3 150 7 LED 1 LED 2 Established date Revised date A18 Error symptom Content Check power inpu...

Page 84: ...justment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A20 Established date Revised date Error symptom Content A20 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 85: ...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 A21 Established date Revised date Error symptom Content A21 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 86: ...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 A22 Established date Revised date Error symptom Content A22 1 SPK_R FT 2 SPK_R FT 3 SPK_L FT 4 SPK_L FT Copyright 2019 LG Electronics Inc A...

Page 87: ...echnical Manual Remote control operation checking method D Function error A23 Established date Revised date Error symptom Content A23 Checking order to check remote control IR EYE Sensor Pin Pin name 1 VCC 2 USB_DM 3 USB_DP 4 GND 5 WOL WIFI_ON 6 VCC 7 WIFI_Suspend Resume 8 GND 9 Combo_Reset 10 BT_WAKEUP_HOST 11 GND 12 VCC 13 14 15 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 VCC 23 KEY2 2...

Page 88: ... board 2 Check the 3 5V on the terminal 22 Checking order to check motion remote wifi Wifi BT Front Wifi BT Rear A24 Pin Pin name 1 VCC 2 USB_DM 3 USB_DP 4 GND 5 WOL WIFI_ON 6 VCC 7 WIFI_Suspend Resume 8 GND 9 Combo_Reset 10 BT_WAKEUP_HOST 11 GND 12 VCC 13 14 15 16 EYE_SDA 17 EYE_SCL 18 GND 19 IR 20 LED_R 21 GND 22 VCC 23 KEY2 24 KEY1 25 GND Copyright 2019 LG Electronics Inc All rights reserved On...

Page 89: ...to use the Service remote control D Function error A25 Established date Revised date Error symptom Content A25 0 4 1 3 0 4 1 3 1 How to access the remote control Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 90: ...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 91: ...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 92: ...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 11 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 2019 LG Electronics Inc All rights re...

Page 93: ... types of patterns using the ADJ 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 A29 Established date Revised date Error symptom Content A29 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 94: ...Smart JIG Power Diagnosis Muitl Gender Guide P N RAD33187801 P N RAD32507801 A30 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 95: ...K80 UK89 SK85 SK96 SK95 SK99 SM90 SM98 18Y 19Y UK63 UK64 UK65 UK68 UK7050 UM73 UM74 UM75 UM76 UM79 UM80 New JIG OLD JIG Cable Connection 18 Marking check No Marking 24 Marking Check 15Y OLED 17 18Y 19Y W7 B8 C8 E8 G8 W8 B9 C9 E9 W9 18Y 19Y LK57 32 43 49LK54 32LK61 32LK62 43 49LK61 LM57 LM63 18Y 19Y UK74 UK75 UK77 UK78 SK79 SM80 SM86 16Y UH 16 18Y 19Y UH UK UM 17Y 18Y SJ UJ UK SK 16Y 17Y UH SJ 16Y ...

Page 96: ... LH68 LH66 LH60 LH54 17 OLED B7 C7 E7 G7 W7 17 LED SJ95 UJ98 SJ85 UJ94 SJ80 UJ77 UJ75 UJ78 UJ65 UJ68 UJ63 UJ67 LJ61 LJ68 LJ55 LJ58 18 LED SK80 SK85 SK95 UK78 UK75 UK77 SK79 UK63 UK64 UK65 UK68 UK7050 LK57 32 43 49LK54 32LK61 62 43 49LK61 18 OLED B8 C8 E8 G8 W8 19 LED SM80 SM85 SM86 UM73 UM74 UM75 UM76 UM79 UM80 LM57 LM63 19 OLED B9 C9 E9 W9 Copyright 2019 LG Electronics Inc All rights reserved Onl...

Page 97: ...4 LCD POWER A 2013 Power Board Muitl Gender How to Connect Connect the Muiti Gender to the connector black as shown in picture 2 of the Smart JIG Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 98: ...agnosis can be made only if it is set correctly 24V Power Board Change the switch to 24V of Smart Jig Voltage 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 24V 24V 20V 20V 13 2V 18V 24V Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 99: ... Power Cable connector to the Muitl Gender JIG 24Pin connector 3 1 2 Check power board voltage Switch the product S W in JIG to LCD LCD MODEL Check the power voltage and switch 24V to the correct voltage Fix the LCD MODEL switch to 24V Smart JIG 4 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 100: ...oard Diagnostic method 2 5 6 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 101: ...1 3 2 Switch the LCD MODEL S W to 24V by checking the power voltage Fix the LCD MODEL switch to 24V Smart JIG 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 102: ... switch to 24V Smart JIG Disconnect the Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector When the OK LED 24V 12V turns on Power Board is normal Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 103: ... Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 104: ... Main Board 24Pin Power Cable connector Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 105: ... the Muitl Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 106: ... Muitl Gender JIG 28Pin connector Switch the LCD MODEL S W to 20V by checking the power voltage Fix the LCD MODEL switch to 20V Smart JIG 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 107: ...the Main Board 18Pin Power Cable connector Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 108: ...the Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector When the OK 24V 12V LED turns on Power Board is normal When the NG LED turns on the Power Board can be judged as defective Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 109: ...t the Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 110: ...the Main Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 111: ...e Main Board 12Pin Power Cable connector Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 112: ...e Main Board 28Pin Power Cable connector Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector 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 Copyright 2019 LG Electronics Inc All rights reserved Only for training and service purposes ...

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