LG 49LJ5100M Service Manual

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LED TV

SERVICE MANUAL

CHASSIS : LA77H

MODEL : 49LJ5100/510M

MODEL :

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL70080101 (1705-REV01)

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 limitation, any text, graphics or logos in this Service

Manual.

49LJ5100-UC/49LJ510M-UB

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Summary of Contents for LG 49LJ5100M

Page 1 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.
Page 2: Table Of Contents
SPECIFICATION ..................6 SOFTWARE UPDATE ................8 BLOCK DIAGRAM ................... 9 EXPLODED VIEW .................. 10 DISASSEMBLY GUIDE ................11 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 3: Safety Precautions
When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. - 3 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 5 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. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 6: Specification
1) Temp : 0 ~ 40 deg 2) Humidity : ~ 80 % Storage Environment 1) Temp. : -20 ~ 60 deg 2) Humidity : ~ 85% - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 7 26.97 23.97 74.176 HDTV 1080P 1920*1080 27.00 24.00 74.25 HDTV 1080P 1920*1080 33.71 29.97 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 8: Software Update
(8) After TV turned on, Check the updated SW Version and Tool Option (6) Turn OFF the TV and On. Check the updated SW Version and Tool Option - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 10: 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. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 11: Disassembly Guide
SCREW : 4 ~ 6Kgf.cm (4) Put ‘long nose’ into the hole SCREW : 5 ~ 7Kgf.cm t< 3.0mm SCREW : 5 ~ 7Kgf.cm - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 13 Wrecked audio/discontinuation/noise Remote control & Local switch checking D. Function error External device recognition error E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 14 ☞A3 & A6 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 15 No video / No audio Revised date ☞A13 No video / Check voltage 19V Normal Replace Main No audio of Adaptor Voltage B/D or Repair parts Replace Adaptor Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 16 Tuner soldering Picture 1. Reconnection 2. Install Booster Replace S/W Upgrade Normal Contact with signal distributor Main B/D Picture or broadcaster (Cable or Air) Normal Picture Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 17 (DiSEqC, motor, etc…) Contact with signal S/W Upgrade Change satellite setting distributor (match with installed ANT) or broadcaster (Cable or Air) Normal Normal Picture Picture Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 18 External ☞A10 Check external Compon device/ Check Test pattern device and Replace Main B/D ent, Cable cable HDMI Normal error Request repair for external device/cable Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 19 Main B/D (Component/AV/ error and HDMI by connecting HDMI) Jig, pattern Generator, Set-top Box etc. S/W Upgrade Request repair for external device Normal Screen Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 20 Stand-By : Red Check Adaptor/ Power cord was inserted properly Power LED On ※ ☞A17 Normal Check ST-BY 3.3V Voltage Replace Adaptor or Main B/D Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 21 "POWEROFF_UNKNOWN" Power off by unknown status except listed case Power off by abnormal status except CPU trouble "POWEROFF_ABNORMAL1" Abnormal Power off by CPU Abnormal "POWEROFF_CPUABNORMAL" Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 22 Check user No audio Connection Replace Speaker Connec Screen normal from Main  or Main B/D tion Speaker Cable Insert wafer SPK Cable Normal Audio Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 23 Normal Request repair to external Audio cable/ANT provider (In case of External Input Check and fix external device signal error) Check and fix external device Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 24 When turn off light Baterry of R/C in room If R/C operate, Explain the customer Normal cause is interference Operating from light in room. Replace R/C Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 25 Input - Fix information information Recognition error - S/W Version Fix in Check and fix accordance HDMI external device/cable with technical Recognition error information Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 26 ※ Describe the basis of the description in shown in the solution manual “Part related to nose” in the Owner’s Manual. (For models without any fix information, provide the description) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 27 Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand damage Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 28 A-2/5 <Appendix> Exchange LED driver Board (PSU) A-3/5 Defected Type caused by T-Con/ Inverter/ Module Exchange Module itself (1) A-4/5 Exchange Module itself (2) A-5/5 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 29 C. Audio error_No audio/Normal video Checking method in menu when there is no audio D. Function error_ No response in remote Remote control operation checking method control, key error Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 30 A. Video Error, No Video/Normal Audio Established date Content Check Back Light On with Naked eye Revised date Power On -> disjoint back case -> check lighting Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 31 A. Video Error, No Video/Normal Audio Established date Content Power Board to LED back light Voltage Revised date Measure DC Voltage applying to LED backlight from Main B/D Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 32 2. Enter into W/B ADJUST of item 7 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 © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 33 Content Power Board Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin FHD Model : 48 ~ 51 pin Check LVDS 12V Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 34 Tuner Input Signal Strength Checking Method Revised date When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.). [Non-OS model don’t have UI Check function of signal sensitivity.] Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 35 Established date Content Version Checking Method Revised date Checking SW version method for remote control for adjustment Press the IN-START with the remote control for adjustment Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 36 Revised date As the part connecting to the external input, check the screen condition by signal * Jack spec. : depending on Model Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
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 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 38 T-Con Defect, CNT Broken Abnormal Power Section Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Solder defect, Short/Crack Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 39 Appendix : Exchange T-Con Board (2) Abnormal Power Section Abnormal Power Section Solder defect, Short/Crack Abnormal Display Fuse Open, Abnormal power section Solder defect, Short/Crack Noise GRADATION GRADATION Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 40 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 41 Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 42 Standard Repair Process Detail Technical Manual Error Symptom B. Power Error, No Power Established date Content Check front Display LED Revised date ST-BY condition: Red Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 43 Error Symptom B. Power Error, No Power Established date A11/ Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 44 1. Press the IN-START button of the remote control for adjustment and Enter the menu of 2. ENGINEER OPTION 2. Check the entry into 3. POWER OFF HISTORY Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 45 C. Audio Error, No Audio/Normal Video Established date Content Checking method in menu when there is no audio Revised date Check Connection from Main B/D to Speaker Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
Page 46 4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester needle moves slowly, and defective when it does not move at all. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

This manual is also suitable for:

49lj510m 49lj5100-uc 49lj510m-ub

LG 49LJ5100M Service Manual

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