LG 49SJ800V Service Manual
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LG 49SJ800V Service Manual

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LED TV
LED TV
SERVICE MANUAL
SERVICE MANUAL
CHASSIS : UD71H
MODEL : 49SJ800V
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69780305 (1703-REV00)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
55SJ800V
CONFIDENTIAL
49SJ800V-ZB
55SJ800V-ZB

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  • Page 1 SERVICE MANUAL CHASSIS : UD71H MODEL : 49SJ800V 49SJ800V-ZB 55SJ800V 55SJ800V-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69780305 (1703-REV00) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM .................. 11 EXPLODED VIEW .................. 18 DISASSEMBLY GUIDE ................19 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: Specification

    HELLASSAT 39.0E, HISPASAT 1CDE 30.0WHOTBIRD 13.0E, INTEL- SAT10&7 68.5E, INTELSAT15 85.2E, INTELSAT1R 50.0W, INTEL- SAT903 33.5W, INTELSAT904 60.0E, NILESAT 7.0W, NSS12 57.0E, THOR 0.8W, TURKSAT 42.0E,YAMAL201 90.0E, OTHER - 6 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 7 SPDIF out (1EA) SPDIF out USB (3EA) EMF, For SVC (download) Ethernet Connect(1EA) Ethernet Connect STP cable. PCMCIA Card slot (1EA) PCMCIA slot - 7 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 8 54.00 24.00 297.00 UDTV 2160P 4096*2160 56.25 25.00 297.00 UDTV 2160P 4096*2160 61.43 29.97 296.703 UDTV 2160P 4096*2160 67.50 30.00 297.00 UDTV 2160P - 8 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 9 56.25 25.00 297.00 UDTV 2160P 3840*2160 67.50 30.00 297.00 UDTV 2160P 4096*2160 53.95 23.97 296.70 UDTV 2160P 4096*2160 54.00 24.00 297.00 UDTV 2160P - 9 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Software Update

    (7) Click [Yes] : TV will be DC OFF -> ON (8) After TV turned on, Check the updated SW Version and Tool Option. - 10 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 11: Block Diagram

    BLOCK DIAGRAM 1. SOC Block Diagram - 11 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 12 2. Tuner + CI - 12 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 13: Video & Audio In/Out

    3. Video & Audio IN/OUT - 13 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 14 4. HDMI 2.0 - 14 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 15 5. USB / Wi-Fi / M-Remote / UART - 15 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 16 6. I2C Map - 16 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 17 7. EPI block (PMIC) - 17 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 18: 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. - 18 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 19: Disassembly Guide

    DISASSEMBLY GUIDE 1. After Screw Disassemble, please remove B/C from Module 49"-Screw : 15 ea 55"-Screw : 17 ea - 19 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 20 2. Detach Tape - Screw : 4 ea Detach tape 3. Remove all sort of cable - 20 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Screw : 1 ea Disassemble screw (1ea) and Remove wi-fi cable Remove IR cable and Disassemble Latch (1ea) 5. Screw disassembly -Screw : 9 ea - 21 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 22: Speaker Disassembly

    6. Speaker disassembly 7. Screw disassembly -Screw : 4 ea - 22 - Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 23: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 24 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 25 ☞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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 26 ☞A18 Check various Check and voltages of Power Normal No Video/ replace Board (13.2V…) voltage? No audio MAIN B/D Replace Power Board and repair parts Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 27 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 28 /Cable device and error normal cable Request repair for external device/cable Check external External device device and Replace Main/T-con B/D HDMI /Cable cable error normal Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 29 Replace screen? Screen (Check normal operation of Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Power Error

    Measure voltage of each output of Power B/D Normal? Normal Replace Main B/D voltage? Close Normal Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 31 "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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 32 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection Speaker disconnection Replace Speaker Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 33 (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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 34: Function Error

    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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 35 Replace MR15RA Close Down load the Firmware * If you conduct the loop at 3times, change the M4. * INSTART MENU14.RF Remocon Test3. Firmware download Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 36 “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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 37 4.Camera operating error ☞A4 ☞A25 Check the Camera Ver. Reconnect the Normal Replace INSTART menu is “NULL”? operation? Camera module Main B/D Close Change the Camera module Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 38 Recognition error - 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 39 “Part related to nose” in the Owner’s (For models without any fix information, Manual. provide the description) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 40 Revised date 16/16 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote Replace remote control control damage Stand Replace stand dent Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 41 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 42 Voltage and speaker checking method when there is no audio Remote control operation checking method Motion Remote operation checking D. Function error method Wifi operation checking method Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 43 Check LCD back light with naked eye date <49SJ80> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Attach the tape with pull speaker cable at most. After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 45 Check LCD back light with naked eye date <60SJ80> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 46 Check LCD back light with naked eye date <65SJ80> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 47 2. Enter into White Balance of item 10. 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 48 TUNER input signal strength checking method date <ALL MODELS> Advanced Channels  Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.) Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 49 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 50 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 51 Revised Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 52 Revised Content Check Link Cable(VX1/EPI) reconnection condition date <SJ80> <49”55”> <60”65”> Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 53 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 54 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 55 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 56 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 57 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 58 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 59 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 60 B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 3.5V date <SJ80> <49”,55”> <60”,65”> Check the DC 13.2V. <49”55”> Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 61 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Checking Method

    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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 63 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 64 2.Check the standby 3.5V on the terminal 16 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 © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.
  • Page 65 Checking order to check motion remote/wifi KEY1 Checking order 1.Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2.Check the 3.5V on the terminal 22 Copyright © 2017 LG Electronics. Inc. All rights reserved. Only for training and service purposes.

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