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LG 49LJ5100-UC Service Manual Download Page 37

1. If symptom always occur, pull & reconnect LVDS cable.(Check 

the status of connection) 

 

2. In other case, replace LVDS Cable 

 

3. Check LVDS connection condition 

Standard Repair Process Detail Technical Manual 

  

Error Symptom 

A. Video Error, Color Error 

Established date 

  

A8/ 

A9 

Content 

Check and replace Link Cable(LVDS) and contact condition 

Revised date 

Copyright © 2017 LG Electronics Inc. All rights reserved. 

Only for training and service purposes.

Summary of Contents for 49LJ5100-UC

Page 1: ... 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 limitation any text graphics or logos in this Service Manual Copyright 2017 LG E...

Page 2: ...ights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 SOFTWARE UPDATE 8 BLOCK DIAGRAM 9 EXPLODED VIEW 10 DISASSEMBLY GUIDE 11 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: ...fication and performance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must 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...

Page 7: ... Proposed Remark HDMI PC DDC 1 640 350 70Hz 31 46 70 09 25 17 EGA X 2 720 400 70Hz 31 46 70 08 28 32 DOS O 3 640 480 60Hz 31 46 59 94 25 17 VESA VGA O 4 800 600 60Hz 37 87 60 31 40 00 VESA SVGA O 5 1024 768 60Hz 48 36 60 00 65 00 VESA XGA O 6 1152 864 60Hz 54 34 60 05 80 002 VESA O 7 1280 1024 60Hz 63 98 60 02 108 0 VESA SXGA O FHD only 8 1360 768 60Hz 47 71 60 01 85 50 VESA WXGA O 9 1920 1080 60H...

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

Page 9: ...4 48 49 EEP SDA EEP SCL 93 92 91 90 SPI_DI SPI_CLK SPI_DO SPI_CZ S AMP_19V LPF JK403 P303 IR KEY1 2 ST_3 3V P_19V Q204 SSM3J332R IC204 TJ1117 DDR_1 8V N_3 3V Q202 SSM3J332R Panel_Vcc IC205 MP2315GJ USB_5V USB_DN USB_DP IF_N JK404 Comp R L In AV1 In 24 29 30 19 21 23 29 30 3 18 28 27 46 47 45 108 107 123 128 1 2 113 114 37 IF_P 57 64 USB_DN USB_DP 51 50 USB_5V 40 41 44 53 54 55 56 3 11 118 119 HDMI...

Page 10: ...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 SAFETY NOTICE 200 400 800 540 500 120 LV1 902 901 700 720 A10 AR1 ...

Page 11: ...to Long nose pliers 4 Put long nose into the hole 5 Open B C with push pulling long nose to upper and lower sides 6 Disassemble Back cover Disassemble it from left to right for top side hook on Back cover DISASSEMBLY w t W 4 0mm t 3 0mm Tool spec Long nose pliers Needle nose pliers M3 5 5 1EA M4 10 4EA Taptite M3 10 5EA Taptite SCREW TORQUE SCREW 4 6Kgf cm SCREW 5 7Kgf cm SCREW 5 7Kgf cm ...

Page 12: ...TROUBLE SHOOTING GUIDE Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 13: ...n off while viewing power auto on off 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 External device recognition error 12 12 E Noise Circuit noise mechanical noise 13 13 F Exterior error Exterior defect 14 First of all Check whether there is SVC Bulletin in GSCS System for these model Contents of Sta...

Page 14: ...alue before replacing the Main Board Replace Main Board Re enter White Balance value Precaution A4 A1 A2 A3 A6 First of all Check whether all of cables between board is inserted properly or not Main B D Adaptor LVDS Cable Speaker Cable IR B D Cable Normal Audio On Y N Normal Voltage Normal Voltage Y N Y N Error Symptom A Video Error Established date 1 14 Content No video Normal audio Revised date ...

Page 15: ... D or Repair parts Replace Adaptor Normal Voltage Y N Error Symptom A Video Error Established date 2 14 Content No video No audio Revised date Standard Repair Process A13 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 16: ...sing Diagnostics menu on OSD Menu Customer Support red button on remote control Signal Test Signal strength Normal over 50 Signal quality Normal over 50 Y Contact with signal distributor or broadcaster Cable or Air N N Y N A6 End Normal Signal Normal Picture Normal Picture Normal Picture SVC Bulletin End End Normal Picture Error Symptom A Video Error Established date 3 14 Content Tuning fail Pictu...

Page 17: ...heck satellite setting Check LNB frequency Check satellite Check Satellite connection DiSEqC motor etc Contact with signal distributor or broadcaster Cable or Air N Check Tuner soldering Replace Main B D Normal Picture Normal Picture Normal Setting SVC Bulletin Normal Signal End End Error Symptom A Video Error Established date 4 14 Content Tuning fail Picture broken freezing Revised date Standard ...

Page 18: ...ble Replace Main B D N A7 N Y Replace module Request repair for external device cable Check Test pattern A10 A8 A9 End Color error Color error External device Cable Normal External Input Compon ent HDMI error Error Symptom A Video Error Established date 5 14 Content Color error Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All rights reserved Only for training and service ...

Page 19: ...Box etc N Y Replace Main B D Check screen condition by input External Input Component AV HDMI Request repair for external device Check S W Version Y N S W Upgrade Y N Y N Replace Main B D Replace Module A7 A8 A9 Check Test pattern N End Screen normal Screen normal Screen normal Screen normal Screen normal End End Check Version Normal Screen External Input error Error Symptom A Video Error Establis...

Page 20: ...Replace Main B D N Y Check ST BY 3 3V N Replace Adaptor or Main B D Y A11 A17 Stand By Red Power LED On Normal Voltage Normal Operati on Error Symptom B Power Error Established date 7 14 Content No power Revised date Standard Repair Process End Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 21: ...WEROFF_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 Download POWEROFF_UNKNOWN Power off by unknown status except listed case Abnormal POWEROFF_ABNORMAL1 Power off by abnormal status except CPU trouble POWEROFF_CPUABNORMAL Power off by CPU Abnormal Pleas...

Page 22: ...r SPK Cable Replace Speaker or Main B D Connec tion Error Symptom C Audio Error Established date 9 14 Content No audio Normal video Revised date Standard Repair Process A15 Normal Audio End Y N Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 23: ...rnal device Replace Main B D N A13 End Signal Normal Normal Voltage Normal Audio Wrecked Audio Discontinuation Noise for all audio Wrecked Audio Discontinuation Noise only for D TV Wrecked Audio Discontinuation Noise only for Analog Wrecked Audio Discontinuation Noise only for External Input N Replace Main B D Error Symptom C Audio Error Established date 10 14 Content Wrecked audio Discontinuation...

Page 24: ...ck 3 3V On Main B D A17 N N Check Voltage 19V of Adaptor A13 Check IR Output signal N Y Replace IR B D N A17 Replace Main B D Y A17 End Normal Operating Normal Voltage Normal Signal Normal Operating Normal Operating End Y Error Symptom D Function Error Established date 11 14 Content Remote control Local switch checking Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All righ...

Page 25: ...ith technical information Signal Input Technical information External Input and Component Recognition error HDMI Recognition error Error Symptom D Function Error Established date 12 14 Content External device recognition error Revised date Standard Repair Process Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 26: ... For models without any fix information provide the description or 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 Circuit noise Mechanical noise Error Symptom E Noise Established date 13 14 Content Circuit noise Mechanical noi...

Page 27: ...Replace stand Standard Repair Process Module damage Cabinet damage Remote control damage Stand damage Error Symptom F Exterior Defect Established date 14 14 Content Exterior defect Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 28: ...k Cable LVDS reconnection condition A8 A9 11 Adjustment Test pattern ADJ Key A10 12 13 A Video error_Vertical Horizontal bar residual image light spot connection diagram A8 14 Check Link Cable LVDS reconnection condition A8 A9 15 Adjustment Test pattern ADJ Key A10 16 Appendix Defected Type caused by T Con Inverter Module Exchange T Con Board 1 A 1 5 17 Exchange T Con Board 2 A 2 5 18 Exchange LED...

Page 29: ...g POWER OFF MODE checking method A14 28 C Audio error_No audio Normal video Checking method in menu when there is no audio A15 29 D Function error_ No response in remote control key error Remote control operation checking method A17 Contents of Standard Repair Process Detail Technical Manual First of all Check whether there is SVC Bulletin in GSCS System for these model Copyright 2017 LG Electroni...

Page 30: ...On disjoint back case check lighting Error Symptom A Video Error No Video Normal Audio Established date A1 Content Check Back Light On with Naked eye Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 31: ...age applying to LED backlight from Main B D Error Symptom A Video Error No Video Normal Audio Established date A2 Content Power Board to LED back light Voltage Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 32: ...of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD Standard Repair Process Detail Technical Manual Error Symptom A Video Error No Video Normal Audio Established date A3 Content Check White Balance value Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 33: ...2V Error Symptom A Video Error No Video Normal Audio Established date A4 Content Power Board Voltage Measuring Method Revised date HD Model 27 30 pin FHD Model 48 51 pin Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 34: ...function of signal sensitivity Standard Repair Process Detail Technical Manual Error Symptom A Video Error Video lag stop Established date A5 Content Tuner Input Signal Strength Checking Method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 35: ...control for adjustment Press the IN START with the remote control for adjustment Error Symptom A Video Error No Video Normal Audio Established date A6 Content Version Checking Method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 36: ...heck the screen condition by signal Jack spec depending on Model Error Symptom A Video Error Vertical Horizontal bar Residual Image Light spot Established date A7 Content connection diagram Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 37: ...le 3 Check LVDS connection condition Standard Repair Process Detail Technical Manual Error Symptom A Video Error Color Error Established date A8 A9 Content Check and replace Link Cable LVDS and contact condition Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 38: ...t 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 T Con Board 1 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 39: ... Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange T Con Board 2 Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 40: ...e Module 1 Crosstalk Crosstalk Press damage Press damage Un repairable Cases In this case please exchange the module Press damage Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 41: ... Vertical 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 Un repairable Cases In this case please exchange the module Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 42: ...Technical Manual ST BY condition Red Error Symptom B Power Error No Power Established date A10 Content Check front Display LED Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 43: ...al Check Voltage 19V of Adaptor Power Error Symptom B Power Error No Power Established date A11 A12 Content Checking Method When Power is ON Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 44: ...ck the entry into 3 POWER OFF HISTORY Standard Repair Process Detail Technical Manual Error Symptom B Power Error Off when on off whiling viewing Established date A13 Content Power off Mode checking method Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 45: ...ocess Detail Technical Manual Error Symptom C Audio Error No Audio Normal Video Established date A15 Content Checking method in menu when there is no audio Revised date Copyright 2017 LG Electronics Inc All rights reserved Only for training and service purposes ...

Page 46: ...ower is in ON condition it is normal when the Analog Tester needle moves slowly and defective when it does not move at all Standard Repair Process Detail Technical Manual P302 Sub Ass y Main Ass y Error Symptom D Function Error No Response in remote control Key error Established date A17 Content Remote control operation checking method Revised date Copyright 2017 LG Electronics Inc All rights rese...

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