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LG 24LJ480U Service Manual
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LG 24LJ480U Service Manual

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LED TV
SERVICE MANUAL
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO :
MFL70041005 (1704-REV00)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
LD70B
24LJ480U
CONFIDENTIAL
24LJ480U-PZ

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Summary of Contents for LG 24LJ480U

  • Page 1 LED TV SERVICE MANUAL CHASSIS : LD70B MODEL : 24LJ480U 24LJ480U-PZ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70041005 (1704-REV00) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................11 BLOCK DIAGRAM .................. 12 EXPLODED VIEW .................. 13 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only 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 training and service purposes.

  • Page 4: Servicing Precautions

    Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the - 4 - Copyright © LG Electronics Inc. All rights reserved. Only 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. 3. Solder the connections. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 6: Specification

    3.Test method 1) Performance : LGE TV test method followed 2) Demanded other specification - Safety : CE,IEC specification - EMC : CE,IEC specification - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 YAMAL201 90.0E , OTHER Television system 1) Digital TV - DVB-T/T2 - DVB-C - DVB-S/S2 2) Analogue TV - PAL/SECAM B/G/I/D/K - SECAM L/L’ - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 SPDIF out USB (1EA) EMF, DivX HD, For SVC (download) JPEG, MP3, DivX HD Ethernet Connect(1EA) Ethernet Connect PCMCIA Card slot PCMCIA slot (1EA) - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 33.71 29.97 HDTV 1080P 1920*1080 33.75 30.00 HDTV 1080P 1920*1080 56.25 50.00 HDTV 1080P 1920*1080 67.43 59.94 HDTV 1080P 1920*1080 67.50 60.00 HDTV 1080P - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 37.879 60.317 VESA(SVGA) 1024 x 768 @60Hz 48.363 60.004 VESA(XGA) 1152 x 864 @60Hz 54.348 60.053 VESA 1360 x 768 @60Hz 47.712 60.015 VESA(WXGA) - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 11: Software Update

    1) Push "IN-START" key in service remote control. 2) Select "Tool Option 1" and Push “OK” button. 3) Punch in the number. (Each model has their number.) - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: Block Diagram

    BLOCK DIAGRAM - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: 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. Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 14: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 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 training and service purposes.
  • Page 16 ※Precaution ☞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 training and service purposes.
  • Page 17 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 training and service purposes.
  • Page 18 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 training and service purposes.
  • Page 19 Input 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 training and service purposes.
  • Page 20 Version normal 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 training and service purposes.
  • Page 21 Stand-By : Red Check Adaptor/ Power cord was inserted properly Power LED On ※ ☞A16 Normal Check ST-BY 3.4V Voltage Replace Adaptor or Replace Main B/D Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 Power off by S/W Download "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 training and service purposes.
  • Page 23 ☞A15 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 training and service purposes.
  • Page 24 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 training and service purposes.
  • Page 25 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 training and service purposes.
  • Page 26 Replace Main B/D signal 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 training and service purposes.
  • Page 27 KMS fix information and then proceed as the process by stage. shown in the solution manual (For models without any fix information, provide the description) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 Exterior defect 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 training and service purposes.
  • Page 29 Exchange T-Con Board (2) 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 training and service purposes.
  • Page 30 Checking method in Setting when there is no C. Audio error_No audio/Normal video 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 training and service purposes.
  • Page 31 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 training and service purposes.
  • Page 32 A. Video Error, No Video/Normal Audio Established date Content Main 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 training and service purposes.
  • Page 33 2. Enter into White Balance of item 11 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 training and service purposes.
  • Page 34 A. Video Error, No Video/Normal Audio Established date Content Power Voltage Measuring Method Revised date HD Model : 27 ~ 30 pin Check LVDS Voltage 12V Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 All Settings  Programmes  Programme Tuning & Settings  Manual Tuning  Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 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 training and service purposes.
  • Page 37 Content Connection diagram 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 training and service purposes.
  • Page 38 A. Video Error, Color Error Established date Content Check and replace Link Cable(LVDS) and contact condition Revised date 1. Check and replace LVDS Cable 2. Check LVDS connection condition Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 You can view 10 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) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 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 training and service purposes.
  • Page 41 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 training and service purposes.
  • Page 42 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 training and service purposes.
  • Page 43 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 training and service purposes.
  • Page 44 B. Power Error, No Power Established date Content Check front Display LED Revised date ST-BY condition: Red Front LED control : All Settings  General  Standby Light  On/Off Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 Standard Repair Process Detail Technical Manual Error Symptom B. Power Error, No Power Established date A12/ Content Checking Method When Power is ON Revised date Check Voltage 19V of Adaptor Power Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 Power off Mode checking method Revised date 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 KEY2 LED_R ① < Sub Ass’y> < Main Ass’y> ② 1, 2. Check IR cable condition between IR & Main board 3. Check the 3.4V_ST Voltage Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 2. Connect the tester RX1 to the speaker terminal and if you hear the “Chik Chik” sound when you touch the GND and output terminal, the speaker is normal. Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

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