LG 32LJ59 U Series Service Manual
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LG 32LJ59 U Series Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : LD75M
MODEL:
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69920608 (1702-REV00)
Copyright ©
LG Electronics. Inc. All rights reserved. Only for training and service purposes.
Copyright ©
32LJ59*U
32LJ59*U
Only for training and service purposes
CONFIDENTIAL
-
ZA

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Summary of Contents for LG 32LJ59 U Series

  • Page 1 32LJ59*U 32LJ59*U CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69920608 (1702-REV00) Copyright © Only for training and service purposes LG Electronics. Inc. All rights reserved. Only for training and service purposes. Copyright ©...
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................8 BLOCK DIAGRAM ................... 9 EXPLODED VIEW .................. 11 .................. 12 DISASSEMBLY 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 4: Servicing Precautions

    - 4 - 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: Application Range

    Temp : 0 ~ 40 deg Humidity : ~ 80 % Storage Environment Temp. : -20 ~ 60 deg Humidity : ~ 85% - 6 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 7 33.71 29.97 74.176 HDTV 1080P 1920*1080 33.75 30.00 74.25 HDTV 1080P 1920*1080 67.43 59.94 148.352 HDTV 1080P 1920*1080 67.50 60.00 148.50 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 9: Block Diagram

    BLOCK DIAGRAM - 9 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Power Block Diagram

    2.Power Block Diagram - 10 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 11: 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. ARC1 - 11 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 12 DISASSEMBLY - 12 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 13 - 13 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 14: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE `17 years New Models < Applicable Model > 32LJ59*U -ZA (LD75M) Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Main PCB <SIZE: 165X183> 12.5~13.8V Main processor LGE7321 DDR3 Memory 2133Mbps 512MB x 2EA eMMC MICOM for KEY/IR sensing Audio AMP Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 16: Main Pcb Assy

    Main PCB Assy Main PCB: Depending on Model Power SPEAKER Module WIFI Local Key +IR Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 17 Interconnection 32LJ59 [PCBs] Main PCB IR_Local Key ASSY WIFI only ASSY Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 18 E. Noise Circuit noise, mechanical noise F. Exterior error Exterior defect First of all, Check whether there is SVC Bulletin in GSCS System for these model. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 19 ※Precaution ☞A4 & A2 Always check & record S/W Version and White Replace Main Board Re-enter White Balance value Balance value before replacing the Main Board Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 2/16 ☞A18 Check various Check and Normal voltages of Power No Video/ replace voltage? No audio Board (13V…) MAIN B/D Replace Power Board and repair parts Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Picture? S/W Version Bulletin? 1. Reconnection S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Replace Main/T-con B/D device and error normal cable Request repair for external device/cable Check external External device HDMI device and /Cable Replace Main/T-con B/D error cable normal Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Replace Screen (Check normal operation of normal? Main /T-con External Input, Component, RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY 7.8V voltage? ☞A18 Replace Power B/D Replace Power Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Power off by S/W Download "POWEROFF_UNKNOWN" Power off by unknown status except listed case "POWEROFF_ABNORMAL1" Power off by abnormal status except CPU trouble Abnormal "POWEROFF_CPUABNORMAL" Power off by CPU Abnormal Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 13V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconnection Replace MAIN Board Speaker disconnection Replace Speaker Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 External Input (In case of Connect and check Normal External Input other external audio? signal error) device Check and fix external device Check and fix external device Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Close operating? Explain the customer cause is interference from light in room. Replace R/C Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 INSTART menu is “NG”? Voltage? 1pin Main B/D ☞A24 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac value Close is “NG”? Change the Wifi assy Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 30 Recognition error signal - S/W Version HDMI/ Check and fix DVI, Optical Replace Main B/D Fix in external device/cable Recognition error accordance with technical information Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 ※ Describe the basis of the description (For models without any fix information, in “Part related to nose” in the Owner’s provide the description) Manual. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 <Appendix> Defected Type caused by T-Con/ Exchange Power Board (PSU) A-3/5 Inverter/ Module Exchange Module (1) A-4/5 Exchange Module (2) A-5/5 Continue to the next page Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Remote control operation checking method Motion Remote operation checking D. Function error method Wifi operation checking method Camera operation checking method Not Used E. Etc Tool option changing method Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Check LCD back light with naked eye Content date <32LJ59*U -ZA> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 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. (Cool/Medium/Warm), re-enter the value after replacing the MAIN BOARD. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 Content date <ALL MODELS>  All Setting  Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Revised Version checking method Content date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2. After measuring each voltage from power supply, finally replace the MAIN BOARD. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Revised Connection diagram (1) Content date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 A. Video error_Color error symptom date Revised Content Check Link Cable(VX1) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 You can view 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!) Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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 A - 1/5 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Appendix : Exchange Main 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 A - 2/5 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Appendix : Exchange the Module (1) Press damage Press damage Press damage Crosstalk Crosstalk Un-repairable Cases In this case please exchange the module. A - 4/5 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect A - 5/5 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 48 Error Established B. Power error _No power symptom date Revised Content Check front Power Indicator date ST-BY condition: On or Off Power ON condition: Turn Off Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Check power input voltage and ST-BY 3.5V Content date Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2. Check the entry into adjustment item 3 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 1. Press the Setting button on the remote control 2. Select the Sound function of the Menu 3. Select the Sound Out 4. Select TV Speaker Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 3.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 © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 2.Check the standby 3.5V on the terminal 22 pin (③) 3.AS checking the Pre-Amp(IR LED light) , the power is in ON condition, an Analog Tester needle should move slowly, otherwise, it’s defective. Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 Checking order to check WiFi KEY2 KEY1 Checking order 1.Check IR/Wifi cable condition between Wifi assy & Main board. 2.Check the 3.5V on the terminal A23/A24 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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