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LG 49UJ6300 Service Manual
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LG 49UJ6300 Service Manual

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LED TV
SERVICE MANUAL
CHASSIS : UA71P
MODEL : 49UJ6300
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69823929 (1702-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
49UJ6350
CONFIDENTIAL
49UJ6300-UA
49UJ6350-UC

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Summary of Contents for LG 49UJ6300

  • 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 CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................ 3 SERVICING PRECAUTIONS ..............4 SPECIFICATION ..................6 SOFTWARE UPDATE ................9 BLOCK DIAGRAM ................. 10 EXPLODED VIEW .................. 20 DISASSEMBLY ..................21 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 -...
  • Page 3 SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the 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.
  • Page 4 SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo- NOTE: If unforeseen circumstances create conflict between the sure of the assembly.
  • Page 5 IC Remove/Replacement 3. Solder the connections. Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to cuit foil.
  • Page 6 SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range 3. Test method This specification is applied to the LED TV used UA71J (1) Performance: LGE TV test method followed chassis. (2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC 2.
  • Page 7 5. External Input Support Format 5.1. Component (Y, C Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 720*480i 15.73 59.94 13.50 SDTV, DVD 480I(525I) 720*480i 15.75 60.00 13.51 SDTV, DVD 480I(525I) 720*480p 31.47 59.94 27.00 SDTV 480P 720*480p 31.50 60.00 27.02 SDTV 480P 1280*720p 44.96 59.94...
  • Page 8 Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 640*480 31.46 59.94 25.12 SDTV 480P 640*480 31.5 60.00 25.12 SDTV 480P 720*480 15.73 59.94 13.50 SDTV, DVD Spec. out but display 480I(525I) 720*480 15.75 60.00 13.51 SDTV, DVD 480I(525I) 720*576 15.62 50.00 13.50 SDTV, DVD 576I(625I) 50Hz 720*480...
  • Page 9 SOFTWARE UPDATE 1. USB 2. NSU (1) Insert the USB memory Stick to the USB port (This Function is needed to connect to the internet) (2) Automatically detect the SW Version and show the below message (1) Menu -> All Settings -> General -> About This TV (3) Click [YES]: initiate the download and install of the update.
  • Page 10 BLOCK DIAGRAM 1. Main IC - 10 -...
  • Page 11 2. I2C - 11 -...
  • Page 12 3. Power - 12 -...
  • Page 13 4. Tuner - 13 -...
  • Page 14 5. Video/Audio - 14 -...
  • Page 15 6. I2C Map AMP_MUTE SIDE_HP_MUTE - 15 -...
  • Page 16 7. EPI block (PMIC) CEC_REMOTE - 16 -...
  • Page 17 8. USB / WIFI / M-REMOTE / UART - 17 -...
  • Page 18 9. LGD 60Pin Interface - 18 -...
  • Page 19 10. BOE 68Pin Interface - 19 -...
  • Page 20 EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the 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.
  • Page 21 DISASSEMBLY GUIDE Total Screw No.: 10ea 1. After Screw Disassemble, please remove B/C from Module Screw : 15 ea [Fig.1] 2. Detach Tape Detach tape [Fig.2] - 21 -...
  • Page 22 3. Remove all sort of cable [Fig.3] 4. IR assy, WiFi PCB assy disassembly Disassemble screw (1ea) and Remove wi-f i cable Remove IR cable [Fig. 4] - 22 -...
  • Page 23 5. Screw disassembly Screw : 9 ea [Fig.6] 6. Speaker disassembly (Disassemble ⓑ→ⓐ) [Fig.7] - 23 -...
  • Page 24 8. Screw disassembly ⓐ Disassemble squence ⓐ→ⓑ) Screw : 4ea [Fig.8] ⓑ - 24 -...
  • Page 25 TROUBLE SHOOTING GUIDE...
  • Page 26 Contents of Standard Repair Process Error symptom (High category) Error symptom (Mid category) Page Remarks No video/Normal audio No video/No audio Picture broken/ Freezing A. Video error Color error Vertical/Horizontal bar, residual image, light spot, external device color error No power B.
  • Page 27 Standard Repair Process Established A. Video error Error date symptom No video/ Normal audio Revised date 1/16 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, LVDS Cable, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A18 Replace T-con/Main...
  • Page 28 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date 2/16 ☞A18 Check and Check voltage of No Video/ Normal Power Board ( 13V…) replace No audio voltage? MAIN B/D Replace Power Board and repair parts...
  • Page 29 Standard Repair Process Established A. Video error Error date symptom Picture broken/ Freezing Revised date 3/16 . By using Digital signal level meter ☞ A3 . By using Diagnostics menu on OSD ( Advanced→ Channels→ Channel Tuning→ Manual Tuning → Check the Signal ) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%)
  • Page 30 Standard Repair Process Established A. Video error Error date symptom Color error Revised date 4/16 ☞ A7 ☞A6 ※ Check Check color by input and replace -External Input Link Cable Color Color Color -COMPONENT Replace module Replace Main B/D error? (V by one) error? error?
  • Page 31 Standard Repair Process A. Video error Established Error date symptom Vertical / Horizontal bar, residual image, Revised date 5/16 light spot, external device color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞A6 ☞ A7 Check color condition by input Check external Check and -External Input...
  • Page 32 Standard Repair Process Established B. Power error Error date symptom No power Revised date 6/16 ☞A17 ☞A18 DC Power on Replace Check Power LED Normal Check Power by pressing Power Key Power On ‘”High” Logo LED operation? On Remote control .
  • Page 33 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 7/16 Check outlet ☞A19 Check Power Off Check A/C cord Error? Normal? Replace Main B/D Mode Abnormal Check for all 3- phase Abnormal Replace Power B/D power out...
  • Page 34 Standard Repair Process Established C. Audio error Error date symptom No audio/ Normal video Revised date 8/16 ☞A20 ☞A21+A18 Check user Check audio B+ No audio Normal menu > 13V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconnection...
  • Page 35 Standard Repair Process Established C. Audio error Error date symptom Wrecked audio/ discontinuation/noise Revised date 9/16 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio ☞A21+A18 Wrecked audio/ Check and replace Check audio Discontinuation/ speaker and B+ Voltage (13V) Noise for connector...
  • Page 36 Standard Repair Process D. Function error Established Error date symptom Remote control & Local switch checking Revised date 10/16 1. Remote control(R/C) operating error Replace Main B/D ☞A22 ☞A22 ☞A22 Check & Repair Check B+ Check R/C itself Normal Normal Normal Check IR Normal...
  • Page 37 Standard Repair Process D. Function error Established Error date symptom MR15 operating checking Revised date 11/16 2. MR15 (Magic Remocon) operating error ☞A4 Check the RF Receiver ver Check MR15 Normal Turn off/on the Press the Is show ok is “00.00”? INSTART menu operating? itself Operation...
  • Page 38 Standard Repair Process D. Function error Established Error date symptom Wifi operating checking Revised date 12/16 3.Wifi operating error ☞A4 ☞A24 Check the Wi-Fi Mac value Check the Wifi wafer Normal Replace is “NG”? INSTART menu Voltage? 1pin Main B/D ☞A24 Close Check &...
  • Page 39 Standard Repair Process D. Function error Established Error date symptom Camera operating checking Revised date 13/16 4.Camera operating error ☞A4 ☞A25 Check the Camera Ver. Reconnect the Normal Replace is “NULL”? INSTART menu operation? Camera module Main B/D Close Change the Camera module...
  • Page 40 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 14/16 Check technical Check External Input and information Signal Technical input Replace Main B/D Component input? - Fix information information? Recognition error signal - S/W Version HDMI/ Check and fix DVI, Optical...
  • Page 41 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date 15/16 Identify Check Circuit nose location of Replace PSU noise type noise Mechanical Check location of noise noise ※ When the nose is severe, replace the module (For models with fix information, upgrade the ※...
  • Page 42 Standard Repair Process Established F. Exterior defect Error date symptom Exterior defect 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...
  • Page 43 Contents of Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Check LCD back light with naked eye A. Video error_ No video/Normal audio Check White Balance value TUNER input signal strength checking method A. Video error_ video error /Video lag/stop Version checking method Tuner Checking Part...
  • Page 44 Contents of Standard Repair Process Detail Technical Manual Continued from previous page Error symptom Content Page Remarks Check front display LED B. Power error_ No power Check power input Voltage & ST-BY 3.5V B. Power error_Off when on, off POWER OFF MODE checking method while viewing Checking method in menu when there is no audio...
  • Page 45 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check LCD back light with naked eye date <ALL MODELS> After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations.
  • Page 46 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Content Check White Balance value date <ALL MODELS> Entry method Entry method 1. Press the ADJ button on the remote controller for adjustment. 1. Press the ADJ button on the remote controller for adjustment. 2.
  • Page 47 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER input signal strength checking method Content date <ALL MODELS>  Advanced Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.)
  • Page 48 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date 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...
  • Page 49 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER checking part Content date <ALL MODELS> Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
  • Page 50 Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom residual image, light spot date Revised Content Connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal...
  • Page 51 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Content Check Link Cable(FFC) reconnection condition date <ALL MODELS> Check the contact condition of the Link Cable, especially dust or mis insertion.
  • Page 52 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Adjustment Test pattern - ADJ Key Content date You can view 6 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2.
  • Page 53 Appendix : Exchange Main Board (1) Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken T-Con Defect, CNT Broken 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...
  • Page 54 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...
  • Page 55 Appendix : Exchange Power Board (PSU) No Light Dim Light Dim Light Dim Light No picture/Sound Ok A - 3/5...
  • Page 56 Appendix : Exchange the Module (1) Press damage Press damage Press damage Un-repairable Cases In this case please exchange the module. Crosstalk Crosstalk A - 4/5...
  • Page 57 Appendix : Exchange the Module (2) Vertical Line Vertical Block Vertical Block Source TAB IC Defect Source TAB IC Defect Source TAB IC Defect Horizontal Block Horizontal line Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases...
  • Page 58 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check front Power Indicator date <ALL MODELS>...
  • Page 59 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY 3.5V date Backlight Values Backlight Forward Symbol Unit Values Forward Symbol Unit Voltage Voltage 65UJ65 117.18 130.2 143.22 65UJ63 60UJ65...
  • Page 60 Standard Repair Process Detail Technical Manual Error Established B. Power error _Off when on, off whiling viewing symptom date Revised Content POWER OFF MODE checking method date <ALL MODELS> Entry method 1. Press the IN-START button of the remote control for adjustment 2.
  • Page 61 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Content Checking method in menu when there is no audio date <ALL MODELS> Checking method 1. Press the Setting button on the remote control 2.
  • Page 62 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Voltage and speaker checking method Content date when there is no audio <ALL MODELS> UJ7* VSYNC SCLK DRV_ON PDIM1 ② PWR_ON PDIM2 ① UJ6* DRV_ON PDIM1 ③...
  • Page 63 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date <ALL MODELS> +3.5V IR & LOGO light Front WIFI_DM WIFI_DP WOL_ON 3.5V COMBO_RESET IR & LOGO light Rear COMBO_WAKEUP_DEVICE COMBO_WAKEUP_HOST ③...
  • Page 64 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date <ALL MODELS> +3.5V WIFI_DM ① Wifi & BT Front WIFI_DP WOL_ON 3.5V COMBO_RESET COMBO_WAKEUP_DEVICE COMBO_WAKEUP_HOST Wifi & BT Rear ③...

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