LG 43UV770M Service Manual
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LG 43UV770M Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA7AW
MODEL : 43UV770M
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL70342901 (1709-REV00)
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.
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
43UV770M-UA

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Summary of Contents for LG 43UV770M

  • 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 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 11 DISASSEMBLY ..................12 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

    TV Link CFG Service Only Port for bLAN Rear Control & Service TV-Link Monitor Rear Rear N/A (Spec out) Local Key 1 button (TV on/off) - 6 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 7 43/49/55UV770M only 3840*2160 67.5 30.00 297.00 UDTV 2160P 43/49/55UV770M only 4096*2160 53.95 23.97 296.70 UDTV 2160P 43/49/55UV770M only 4096*2160 UDTV 2160P 43/49/55UV770M only - 7 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 296.70 UDTV 2160P 4096*2160 67.5 30.00 UDTV 2160P 4096*2160 112.5 50.00 UDTV 2160P 4096*2160 134.86 59.94 593.40 UDTV 2160P 4096*2160 60.00 UDTV 2160P - 8 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Auto Download

    (4) After download is completed, reboot is performed. (5) Check the SW version to see if it has been updated and check the Tool option. - 9 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Block Diagram

    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. - 11 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 DISASSEMBLY Total Screw No.: 22ea Screw : 16 ea [Fig.1] Screw : 6 ea P4000 [Fig.2] - 12 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 [Fig.3] [Fig.4] - 13 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 [Fig.5] [Fig.6] - 14 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 15 Screw :9EA [Fig.7] [Fig.8] - 15 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 [Fig.9] [Fig.10] - 16 - Copyright © LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 17: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 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 19 ☞A6 & A3 ※Precaution 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 20 Check various Check and No Video/ Normal voltages of Power replace No audio Voltage Board ( 3.5V,13.2V) MAIN B/D Replace Power Board and repair parts Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 1. Reconnection Tuner soldering 2. Install Booster Normal Contact with signal distributor Replace S/W Upgrade Picture or broadcaster (Cable or Air) Main B/D Normal Picture Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 Check Replace Normal Check Tuner soldering Main B/D S/W Version Signal Bulletin Contact with signal S/W Upgrade distributor or broadcaster (Cable or Air) Normal Picture Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 Cable error cable Normal Request repair for external device/cable External Check external HDMI device/ device and Replace Main B/D error Cable cable Normal Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 24 Screen (Check normal operation HDMI of External Input, Screen Replace Component, HDMI by error normal Main B/D connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 Measure voltage of each output of Power B/D Normal ☞A12 ※ Normal Normal Check ST-BY 3.5V Replace Main B/D Voltage Voltage Replace Power B/D Replace Power B/D Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 "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 27 13.2V of Power Screen normal Voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconn Speaker Replace MAIN Board ection disconnection Replace Speaker Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 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 29 Replace Main B/D (Power B/D don’t have problem) If R/C operate, Normal Explain the customer Operating 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 30 Recognition error - S/W Version Fix in Check and fix HDMI, Optical accordance Replace Main B/D external device/cable with technical Recognition error information Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 KMS fix information and then proceed as 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 32 Revised date 14/14 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 33 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 Continue to the next page Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 Voltage and speaker checking method in audio/discontinuation case of audio error D. Function error_ No response in Remote Control operation checking method remote Control, key error Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 A. Video error_No video/Normal audio symptom date Revised Content Check Back Light On with naked eye date <ALL MODELS> Power On -> disjoint back case -> check lighting. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 A. Video error_No video/Normal audio symptom date Revised Content Main Board to LED back light Voltage date <ALL MODELS> 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 37 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. enter the value after replacing the MAIN BOARD. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 43”/49” A13.2V A13.2V DRV_ON PDIM#1 18 Pin (Power Board ↔ Main Board) SMAW200-H18S5K PWR_ON PDIM#2 D13.2V D13.2V D13.2V 55” A13.2V A13.2V DRV_ON PDIM#1 SCLK V-SYNC Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 Menu  Channels  Channel Tuning  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 for training and service purposes.
  • Page 40 Revised Version checking method Content date 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 41 (1) 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 42 Check and replace Link Cable(LVDS) and contact condition date <ALL MODELS> 1. Check and replace LVDS(or EPI or Vx1) Cable 2. Check LVDS connection condition Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 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 44 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 45 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 46 Appendix : Exchange PSU(LED driver) No Light Dim Light Dim Light Dim Light No picture/Sound Ok Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 Panel Mura, Light leakage Panel Mura, Light leakage Press damage Crosstalk Press damage Crosstalk 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 48 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 49 B. Power error _No power symptom date Revised Content Check front display LED date ST-BY condition: Red Front LED control : Menu  General  Standby Light  On/Off Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 Check power input voltage and ST-BY 3.5V Content date Backlight Values Forward Symbol Unit Voltage 55UV770M 99.4 106.6 113.8 49UV770M 85.05 91.8 43UV770M 65.94 71.4 Check the DC 13V Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 PDIM#1 Check D.13.2V (6,7,8 PIN) 18 Pin (Power Board ↔ Main Board) SMAW200-H18S5K PWR_ON PDIM#2 D13.2V D13.2V D13.2V 55” A13.2V A13.2V DRV_ON PDIM#1 SCLK V-SYNC Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 POWER OFF MODE checking method date <ALL MODELS> Checking order 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 53 Checking order 1. Press the MENU button on the remote Control 2. Select the Sound function of the Menu 3. Select Internal TV Speaker Check Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 54 3. Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound DRV_ON PDIM#1 when you touch the GND and output terminal, the speaker is normal. SCLK V-SYNC Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 2.Check the standby 3.5V 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.

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