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Standard Repair Process Detail Technical Manual

Version checking method

A. Video error_Video 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 © 2018 LG Electronics Inc. All rights reserved.

Only for training and service purposes.

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Summary of Contents for 43UU340C

Page 1: ...S IN THIS MANUAL 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 li...

Page 2: ...ights 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 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: ...3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 Electrical 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 Digital ATSC 64 256 QAM Analog NTSC M 5 Video Input NTSC...

Page 7: ...Blanking 10 1920 1080 135 120 297 UDTV 1080P 11 3840 2160 54 24 00 297 00 UDTV 2160P 12 3840 2160 56 25 25 00 297 00 UDTV 2160P 13 3840 2160 67 5 30 00 297 00 UDTV 2160P 14 4096 2160 53 95 23 97 296 70 UDTV 2160P 15 4096 2160 54 24 297 UDTV 2160P No Resolution H freq kHz V freq kHz Pixel clock MHz Proposed 1 720 480i 15 73 59 94 13 50 SDTV DVD 480I 525I 2 720 480i 15 75 60 00 13 51 SDTV DVD 480I 5...

Page 8: ...6 HDTV 1080P 17 1920 1080p 33 71 29 97 79 120 HDTV 1080P 18 1920 1080p 33 75 30 00 79 20 HDTV 1080P 19 1920 1080p 56 25 50 00 148 5 HDTV 1080P 20 1920 1080p 67 43 59 94 148 35 HDTV 1080P 21 1920 1080p 67 5 60 00 148 50 HDTV 1080P 22 1920 1080p 112 5 100 297 00 UDTV 1080P 23 1920 1080p 134 86 119 88 296 70 UDTV 1080P 24 1920 1080p 135 00 120 297 UDTV 1080P 25 3840 2160p 53 95 23 98 296 70 UDTV 2160...

Page 9: ...tarts and the settings are initialized 4 When the update is finished the TV automatically turns off and then turns on 5 Check the SW version to see if it has been updated and check the Tool option 2 Manual Download 1 Press the Menu button on the remote control to enter All Settings 2 With the focus on the GENERAL menu Press key 7 in succession 7 times and the TV Manager will pop up as shown below ...

Page 10: ...Mbps 256MB X 16EA USB2 2 0 HDMI1 2 0 SYSTEM EEPROM 1Kbit eMMC 4Gbyte DDR4 2666Mbps 256MB X 16EA X_TAL 24MHz I2S Out AV D Demod I2C 2 R E A R S I D E R E A R H EXT AMP SPDIF OUT Tuner I2C 5 CVBS SIF Tuner ARC Ext SPK L R TI MICOM IR Key Eye UART S W Tx Rx RS232 Debug X_TAL 32 768MHz I2C 1 R E A R VBY1 51p Ti Micom VBY1 41p Data Demod TV Link CFG HDMI2 2 0 OCP 1 5A Component ...

Page 11: ...teristics 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 SAFETY NOTICE 400 800 540 521 120 820 LV1 902 121 500 LV2 AR1 700 A10 ARC1 901 530 HP1 HS1 200 ...

Page 12: ...ssembly Latch Screw When assembling the B C from the bottom of the assembled rear upper assembly Side View 2 1 Using AC socket Chassis as centering guide Please do not assembled press curved portion b b b a a a a a a a a a a a Please do assembled press Latch Zone a Press direction down from the outer surface a a a a a a a ...

Page 13: ...ight LG Electronics Inc All rights reserved Only for training and service purposes 2 Disassembly Latch Screw M3 5 5 5EA M3 10 2EA M4 10 1EA SCREW TORQUE SCREW 5 7Kgf cm SCREW 5 7Kgf cm SCREW 5 7Kgf cm Hook Latch ...

Page 14: ...vice purposes 3 Disassembly Back cover When it is Latch decomposition as shown in the figure below and then decomposed by grasping the portions caution Hook can be separated on the top position don t pull it hard for upward Grip for disassembling B C Bottom view of Back Cover Or ...

Page 15: ...TROUBLE SHOOTING GUIDE Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 16: ...ing power auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error Remote control Local switch checking 10 MR15 operating checking 11 11 12 Wifi operating checking 12 13 Camera 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 all Check w...

Page 17: ...tegory Page Remarks 17 G Commercial function error MPI IR out error 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 First of all Check whether there is SVC Bulletin in GSCS System for these model Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 18: ...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 1 16 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 ...

Page 19: ...o 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 2 16 Error symptom 2 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 20: ...ain 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 Establishe...

Page 21: ...rror 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 4 16 Error symptom 4 Copyright 2018 LG Electronics Inc ...

Page 22: ...DVI 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 co...

Page 23: ...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 6 16 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2018 LG Electronics Inc All rights reserved Only for training and ser...

Page 24: ...EY Power off by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Dow...

Page 25: ... 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 8 16 Error symptom Standard Repair Process 8 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 26: ...rnal 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 B...

Page 27: ...heck 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 A22 Replace Main B D Y A22 Standard Repair Process Established date Revised date 10 16 Error s...

Page 28: ...ished date Revised date 11 16 Error symptom 11 Replace MR13 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 Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Receiver ver is 00 00 N Close A23 A4 A4 Copyright ...

Page 29: ...ifi cable connection N Check the Wifi wafer 1pin Standard Repair Process Established date Revised date 12 16 Error symptom 12 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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 30: ...mera Ver is NULL Y N Reconnect the Camera module Standard Repair Process Established date Revised date 13 16 Error symptom 13 Change the Camera module Normal operation Close Y N Replace Main B D A25 A4 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 31: ...eck 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 14 16 Error symptom Standard Repair Process 14 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 32: ...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 33: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ...cess 17 IR OUT Not working Check MPI Connection A24 Same as Guide Y Change cable N N Suitable Data Format Change Remote or Recommend using External IR for STB Y Replace MAIN Board End Check Remote Controller data Format A24 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ...king 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 EPI reconnection condition A7 8 Adjustment Test pattern ADJ Key A8 9 Appendix Defected Type caused by T Con Inverter Module Exchange Main Board 1 A 1 5 10 Exchange Main Board 2 A 2 5 11 Exchange Power Board PSU A 3 5 12 Exchange Module 1 A 4 5 13 E...

Page 36: ...E checking method A19 17 C Audio error_ No audio Normal video Checking method in menu when there is no audio A20 18 Voltage and speaker checking method when there is no audio A21 19 D Function error Remote control operation checking method A22 20 Motion Remote operation checking method A23 21 E Commercial Function error 22 23 24 25 26 Continued from previous page Copyright 2018 LG Electronics Inc ...

Page 37: ... 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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ...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 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ... _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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...6 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 A8 Established date Revised date Error symptom Content A8 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange Main Board 1 A 1 5 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...normal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange Main Board 2 A 2 5 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 47: ...Appendix Exchange Power Board PSU No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 48: ...odule 1 A 4 5 Crosstalk Crosstalk Press damage Press damage Un repairable Cases In this case please exchange the module Press damage Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 49: ...rtical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 A 5 5 Un repairable Cases In this case please exchange the module Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 50: ...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 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 51: ...al Manual Revised date A18 Error symptom Content Check power input voltage and ST BY 3 5V B Power error _No power A18 Check the DC 13 2V 43inch 49inch 55inch 65inch Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 52: ...to adjustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing A19 Established date Revised date Error symptom Content A19 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 53: ...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 A20 Established date Revised date Error symptom Content A20 Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 54: ...peaker 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 A21 Established date Revised date Error symptom Content A21 1 SPK_R FT 2 SPK_R FT 3 SPK_L FT 4 SPK_L FT Copyright 2018 LG Electronics Inc Al...

Page 55: ...log Tester needle should move slowly otherwise it s defective Standard Repair Process Detail Technical Manual Remote control operation checking method D Function error A22 A23 Established date Revised date Error symptom Content A22 A23 Checking order to check remote control IR EYE Sensor IR LOGO light Rear IR Eye LED Copyright 2018 LG Electronics Inc All rights reserved Only for training and servi...

Page 56: ...tablished date Revised date Error symptom Content A24 IR OUT Error 1 Check the Cable Connection IR Out supported by MPI Connection 2 Check the Suitable Data Format of remote controller Copyright 2018 LG Electronics Inc All rights reserved Only for training and service purposes ...

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