LG 43LM5700PTC Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. LED TV
  5. 43LM5700PTC
  6. Service manual

LG 43LM5700PTC Service Manual

Hide thumbs Also See for 43LM5700PTC:
Table of Contents

Advertisement

Quick Links

Download this manual
LED TV
SERVICE MANUAL
CHASSIS : LB94M
MODEL : 43LM5700PTC
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71448404 (1903-REV00)
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
43LM5760PTC
CONFIDENTIAL

Advertisement

Table of Contents
loading

Related Manuals for LG 43LM5700PTC

Summary of Contents for LG 43LM5700PTC

  • Page 1 LED TV SERVICE MANUAL CHASSIS : LB94M MODEL : 43LM5700PTC 43LM5760PTC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71448404 (1903-REV00) Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 12 EXPLODED VIEW .................. 13 DISASSEMBLY GUIDE ................15 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

    - 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. - 5 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 6: Specification

    Side(2EA)_**LM63** , Side(1EA)_**LM57** Ethernet Connect(1 EA) Optical Audio out STP cable Head phone out Antenna, HDMI1, HDMI2, HDMI3, USB1, USB2, AV, Component Only OCEANIA/ASIA - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 74.176 HDTV 1080I 1920*1080 33.75 74.25 HDTV 1080I 1920*1080 56.25 148.5 HDTV 1080P 1920*1080 67.43 59.94 148.5 HDTV 1080P 1920*1080 67.5 148.5 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 8: Hdmi Input

    8K Model Only. This will be 7680*4320 131.87 29.97 1188 added in USERGUIDE after 7680*4320 1188 8K model development. 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 8K Model Only. This will be added 7680*4320 131.87 29.97 1188 in USERGUIDE after 8K model 7680*4320 1188 development. 7680*4320 2376 7680*4320 263.74 59.94 2376 7680*4320 2376 - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 (7) Click [Yes] : TV will be DC OFF → ON. (8) After TV turned on, Check the updated SW Version and (5) [NO] : Keep updating Tool Option. [Yes] : Cancel updating - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 (4) The following pop up window appears. (5) [CHECK NOW] : Go to the About this TV setting page [CLOSE] : Close the pop-up - 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 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. - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 15: Disassembly Guide

    1. Unlock screws (“1”: 1EA, ”2”: 2EA, “3”: 5EA) to separate back cover assembly from module. Detach the Side AV Label(“4”). 2. Detach the Tape(“5”). - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 3. Separate connectors (“6”) from Main/Power PCB and module. Separate Speaker(“7”: 2 EA) from module. - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 4. Unlock screw (“8”: 18 EA) to separate from module. * 1 pole Stand Supporter (“9”: 2 EA) is applied on 1pole Stand type. 5. Detach the Insulation Sheet(“10”). - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 Lift the latch(“14”) to the upside and push the button(“15”) for separation. 7. Separate connectors(“16”) from wifi PCB(“18”). Separate wifi PCB(“18”) from Wifi Bracket of Latch(“17”). - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 8. Detach the foot rubber(“20” : 2 EA) from 2pole Stand(“19”). - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 ■ Step 3 Disassemble the Case Top . ■ Step 4 Remove the EMI Tape on the S-PCB and Separate the S-PCB. * *EMI Tape : 2 EA - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 ■ Step 8 Disassemble the DPS, and the Reflector. * Rotate the DPS to remove (2 EA) * Be careful not to tear the Reflector sheet. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 (1) Cover Bottom’s guide embo & LED Array arrange and attach. (2) LED array squeeze, along cover bottom's surface. (3) Connect LED Array to connector. * Completion of LED Array assemble (3 EA) - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 23: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 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 © 2019 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 26 ☞A18 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (13.2V…) MAIN B/D Replace Power Board and repair parts Copyright © 2019 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 Replace Picture? Main B/D Close Close Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 28 Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External device and Replace Main/T-con B/D HDMI device/Cable cable error normal Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 29 Replace (Check normal operation of HDMI/ Screen Main /T-con External Input, Component, normal? RGB and HDMI/DVI by connecting Jig, pattern Generator ,Set-top Box etc. Copyright © 2019 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? Normal Close Check ST-BY 3.5V voltage? ☞A18 Replace Power B/D Replace Power Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 31 Normal Replace Main B/D Check Power B/D voltage? voltage ※ Caution Check and fix exterior Replace Power B/D of Power B/D Part Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 32 Reboot by SW down load function UNKNOWN No meaning (same as initial value) COMP_END OLED threshold voltage degradation(Compensation) completes. PNWASHDONE Power off by panel noise wash function complited. (OLED) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 33 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Speaker Replace MAIN Board Disconnection disconnection Replace Speaker Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 34 (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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 35: 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 36 Replace MR18 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 37 “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 © 2019 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 Recognition external device/cable accordance error with technical information Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 “Part related to nose” in the Owner’s then proceed as shown in the solution manual Manual. (For models without any fix information, provide the description) Copyright © 2019 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 control Replace remote control damage Stand Replace stand dent Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 41 Exchange Module (1) ~ (3) A-6/11 ~ A-8/11 Inverter/ Module Exchange T-Con (1) ~ (2) A-9/11 ~ A-10/11 Exchange Power Board(PSU) A-11/11 Continue to the next page Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 Check items after Main B/D replacement E. Etc Adjustment Test pattern – ADJ Key How to use JIG (Power B/D Diagnostic Smart Jig Multi Gender) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 43 Revised Check LVDS Content date C2333: 13V (Normal) No Video/Normal audio Reassemble After turning on the power and disassembling the case, check C2233 Voltage 13V Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 44 2. Enter into White Balance. 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 45 TUNER input signal strength checking method Content date  All Settings Programmes Programme Tuning&Settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 46 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 47 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 48 Revised Content connection diagram date As the part connecting to the external input, check the screen condition by signal Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 49 A. Video error_Color error symptom date Revised Content Check Link Cable(LVDS) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 50 Screen darkness to disconnection of the FFC cable pin. G color transient due to poor FFC cable CABLE G Color Excessive connection A - 1/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 51 LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN A - 2/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 52 Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner Inner side quality problem A - 3/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 53 Screen spread Screen corner appears blurry Main Color Spread Color spread on the screen Main Blurry Screen Blurry picture on the screen A - 4/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 54 Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem problem A - 5/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 55 BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken A - 6/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 56 BLU Vertical spreading on cube screen in no MODULE Vertical smear signal MODULE Over color Screen contour part brightly Over color A - 7/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 57 Center of the screen 1 block dark MODULE Screen darkness MODULE Vertical bar Center Vertical Bar Darkness at the MODULE bottom of the MODULE internal BLU breakage screen A - 8/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 58 T-Con is defective and the picture below T-CON image broken the screen is broken A - 9/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 59 The entire screen is dark and bit noise T-CON Image Broken occurs The entire screen is dark and bit noise T-CON Image Broken occurs A - 10/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 60 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 61 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 62 Error Established B. Power error _No power symptom date Revised Check power input voltage and ST-BY 3.5V date Check the VLED Check the DC 13.2V/20V Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 63 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 64: 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 65 3.Connect the tester P5600 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 66 2. Check the standby 3.5V on the terminal (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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 67 Checking order to check motion remote/wifi Checking order 1. Check BT/Wifi cable condition between BT/Wifi assy & Main board. 2. Check the 3.5V on the terminal 1 pin Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 68 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content How to use the Service remote control date 1. How to access the remote control Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 69 Digital EYE function ON/OFF For some Model, access to the Test Pattern TILT Used for screen tilting change (Access to the old PDP control mode) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 70 Connects to external input 1,2,3 COMP1,2 (Added function) Connects to Component 1,2 HDMI1,2,3,4 Connects to HDMI 1,2,3,4 (Add function) DVI (Add function) Connects to DVI Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 71 - Record the R, G, B (GAIN, Cut) value of the color temperature before main board replacement. After replacing the main board, key in the recorded value. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 72 You can view 11 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 © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 73 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 21 (1/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 74: Main Board

    LM63/LM57/LM55 (UH/UJ/SK) 18Pin 24 Marking Check 28Pin 28Pin 12Pin 12Pin 28Pin Cable Connection Includes 49UJ63 17Y/18Y 16Y/17Y 16Y/17Y/18Y/19Y (SJ/UJ/SK) (UH) (UH) A21 (2/19) (UH/SJ) (LH/LJ/LK/LM) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 75 B7 / C7 / E7 / G7 / W7 SJ95/UJ98 SJ85/UJ94 SJ80, UJ77 UJ75/UJ78 ’17 UJ65/UJ68 UJ63/UJ67 LJ61/LJ68 LJ55/LJ58 SK95/SK85 SK81/SK80 ‘18 UK64/UK65 LK61/LK57/LK54 ’19 LM63/LM57/LM55 A21 (3/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 76 “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A21 (4/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 77 - 20V Power Board : Change the switch to 24V of Smart Jig Voltage - 13.2V/18V Power Board : Change the switch to 24V of Smart Jig Voltage Power B/D Smart Jig Voltage Switch 13.2V/18V A21 (5/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 78 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board A30 (17/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

This manual is also suitable for:

43lm5760ptc

Table of Contents