LG 75QNED96TPA Service Manual

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LED TV

SERVICE MANUAL

CHASSIS : UB14Z

MODEL : 75QNED96TPA

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71808653 (2108-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.

Summary of Contents for LG 75QNED96TPA

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 NEW FEATURE ..................10 SOFTWARE UPDATE ................17 BLOCK DIAGRAM ................. 19 EXPLODED VIEW .................. 20 ASSEMBLY / DISASSEMBLY GUIDE ........... 21 TROUBLE SHOOTING GUIDE ..........APPENDIX - 2 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 3 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 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 * Some models do not support HDMI4 USB Input My Media(Movie/Photo/Music List) or SVC SPDIF out (1EA) Optical Audio out Ethernet Connect AV Input CVBS, Audio LR Only for INDIA - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 Support 4K:12Gbps, 8K : 10Gbps HDMI 4 Support 4K:12Gbps, 8K : 10Gbps USB Input EMF, For SVC (download) SPDIF out Optical Audio out Ethernet Connect STP cable (1EA) - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 8 107.89 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 8K Model Only. 7680*4320 1188 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 UHD DeepColor is On (UHD, 8K 120Hz models only), 2560*1440 182.99 119.99 497.7 Support only when UHD Deep- Color is On - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 17 (6) After finishing the update, it will show a pop-up below the picture. (7) Click “Yes” : TV will be turn off and on itself - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 18 “The latest version of the SW is available for your TV. Do you want to update now” (3) [Yes] : update starts. [No] : Close the pop-up, check out later - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 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. - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 NG (In case of imbalance) ▪ Handling guide when moving the product - ▪ Top defect caused by imbalance ① ② ③ ④ ⑤ - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 [Back Cover Disassembly Guide] (1) Lay the TV Set on a flat pad. (Disassemble Stand Assy) (2) Disassemble B/C Screw Screw : 21EA - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 24 (6) Disassemble the latch using Plastic scraper to remove the upper latch 4EA. (outside → inside) Top(Left) Top(Right) Plastic scraper Plastic scraper Plastic scraper Plastic scraper - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 27 TROUBLE SHOOTING GUIDE...
Page 28 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 Off when on, off while viewing, power auto B.
Page 29 Standard Repair Process Established A. Video error Error date symptom No video/ Normal audio Revised date 1/17 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, Each Cable for Panel, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A9 No video...
Page 30 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date 2/17 ☞A9 Check various Check and No Video/ Normal voltages of Power replace No audio voltage? Board (12V…) MAIN B/D Replace Power Board and repair parts...
Page 31 Standard Repair Process Established A. Video error Error date symptom Picture broken/ Freezing Revised date 3/17 . 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 32 Standard Repair Process Established A. Video error Error date symptom Color error Revised date 4/17 ☞ A7 ※ Check and ☞A6 replace Link Check color by input Cable Color Color Color (EPI or Vx1 Replace module -External Input Replace Main B/D error? error? error?
Page 33 Standard Repair Process Established A. Video error Error date symptom Vertical / Horizontal bar, residual image, light spot, Revised date 5/17 external device color error Vertical/Horizontal bar, residual image, light spot Replace Module ☞A6 ☞ A7 Check color condition Check external Check and by input Screen...
Page 34 Standard Repair Process Established B. Power error Error date symptom No power Revised date 6/17 ☞A8 ☞A9 DC Power on Check front Power Normal Check Power Replace by pressing Power Key On ‘”High” Power Indicator Power B/D LED On? operation? On Remote control .
Page 35 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 7/17 Check Power outlet ☞A11 Check Power Off Check A/C cord Error? Replace Main B/D Normal? Mode Abnormal Check for all 2- phase Replace Power B/D power out POLLING...
Page 36 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 8/17 * Please refer to the all cases which can be displayed on power off mode. Power Off list Explanation Action contents Power off when TV is not turned off during a certain time...
Page 37 Standard Repair Process Established C. Audio error Error date symptom No audio/ Normal video Revised date 9/17 ☞A12 ☞A13+A9 Check user No audio Check audio 20V Normal menu > Screen normal of Power Board voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board...
Page 38 Standard Repair Process Established C. Audio error Error date symptom Wrecked audio/ discontinuation/noise Revised date 10/17 → abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio ☞A13+A9 Wrecked audio/ Check and replace Check audio Discontinuation/ speaker and B+ Voltage (20V) Noise for connector...
Page 39 Standard Repair Process Established D. Function error Error date symptom Remote control & Local switch checking Revised date 11/17 1. Remote control(R/C) operating error Replace Main B/D ☞A14 ☞A14 ☞A14 Check & Repair Check R/C itself Normal Normal Check B+3.5V Normal Check IR Normal...
Page 40 Standard Repair Process Established D. Function error Error date symptom Magic Remote control operating checking Revised date 12/17 2. Magic Remote control operating error ☞A4 Turn off/on the Check the RF Receiver Check MR21 Normal Press the Is show ok set and press ver is “00.00”? operating?
Page 41 Standard Repair Process Established D. Function error Error date symptom WiFi operating checking Revised date 13/17 3. WiFi operating error ☞A4 ☞A15 Wi-Fi Mac Check the WiFi wafer Replace Check the Normal value +3.5V_WiFi Voltage? INSTART menu Main B/D is “NG”? ☞A15 Close Check &...
Page 42 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 14/17 Check technical Check External Input information Signal Technical input Replace Main B/D And Component input? - Fix information information? Recognition error signal - S/W Version HDMI/ DVI, Optical Check and fix...
Page 43 Standard Repair Process Established D. Function error Error date symptom Voice Recognition Function Error Revised date 15/17 ☞A15 Check Voice Check Funcion Network Sub Ass’y Recognition Function Check network Is On In Connected? menu? in menu Cable Make the Connect network function ‘on’...
Page 44 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date 16/17 Identify Circuit Check location Replace PSU of noise nose type noise Mechanical Check location of noise noise ※ When the nose is severe, replace the module ※...
Page 45 Standard Repair Process Established F. Exterior defect Error date symptom Exterior defect Revised date 17/17 Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent...
Page 46 Contents of Standard Repair Process Detail Technical Manual Error symptom Content Page Remarks Check Back Light On 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 47 Contents of Standard Repair Process Detail Technical Manual Continued from previous page Error symptom Content Page Remarks Check front display LED(Power Indicator) B. Power error_ No power Check power input Voltage & ST-BY Error check by LED Indicator B. Power error_Off POWER OFF MODE checking method (when on/off, while viewing) Checking method in menu when there is no audio...
Page 48 Standard Repair Process Detail Technical Manual Error Established A. Video error_No video/Normal audio symptom date Revised Content Check Back Light On with naked eye date If the Black light LED assemble is ‘OK’, you can see the lights on each points.
Page 49 Standard Repair Process Detail Technical Manual Error Established A. Video error_No video/Normal audio symptom date Revised Content Check White Balance value date Entry method 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3.
Page 50 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content TUNER input signal strength checking method date  All settings  Programmes Programme Tuning & settings  Manual Tuning When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.)
Page 51 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment...
Page 52 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised TUNER checking part Content date Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
Page 53 Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom residual image, light spot date Revised Content Connection diagram date As the part connecting to the external input, check the screen condition by signal...
Page 54 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Content Check Link Cable(VX1) reconnection condition date Check the contact condition of the Link Cable, especially dust or mis insertion.
Page 55 Appendix. Examples of Symptoms(Image error) #1 Check for poor cable contact Symptom Item Cause Symptom Image Name Poor broken pin of FFC cable CABLE Color smear Color is Excessive due to FFC Cable CABLE R Color Excessive Contact. screen is dark due to poor contact due CABLE Screen darkness to disconnection of the FFC cable pin.
Page 56 Appendix. Examples of Symptoms(Image error) #2 Check for poor cable contact Symptom Item Cause Symptom Image Name CABLE Color spread LVDS cable connection problem CABLE Color spread LVDS cable connection problem CABLE Color spread LVDS cable connection problem Due to foreign substance withi nLVDS CABLE Screen stop cable PIN...
Page 57 Appendix. Examples of Symptoms(Main) #3 Check parts by symptom Symptom Item Cause Symptom Image Name Main Screen noise Bit noise from horizontal screen Broken screen due to Main Screen noise Main IC problem Main Dark picture Dark left-side screen Top/bottom screen part Main Broken picture Picture problem due to tuner...
Page 58 Appendix. Examples of Symptoms(Main) #4 Check parts by symptom Symptom Item Cause Symptom Image Name Main Broken screen Broken screen in a horizontal manner Main 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...
Page 59 No problem at the initial stage, Main Broken picture G-color spread after 10 minutes Right-side Main Screen Right-side screen problem problem LG logo Main Screen picture spread problem Screen problem No problem at the initial stage. Right-side Main During Heat run, right-side picture picture problem...
Page 60 Appendix. Examples of Symptoms(Module) #6 Check parts by symptom Symptom Item Cause Symptom Image Name Isometric Isometric horizontal bars occur MODULE Horizontal Bar throughout the screen BLU internal foreign matter inflow MODULE Internal matter 6 block image broken MODULE Image broken MODULE Image broken Screen sync signal broken...
Page 61 Appendix. Examples of Symptoms(Module) #7 Check parts by symptom Symptom Item Cause Symptom Image Name Internal damage and image breakage MODULE Image broken due to external impact Bend on the Bending due to lateral external impact MODULE screen and internal bending of BLU Vertical spreading on cube screen in no MODULE Vertical smear...
Page 62 Appendix. Examples of Symptoms(Module) #8 Check parts by symptom Symptom Item Cause Symptom Image Name MODULE Vertical bar Center Vertical Bar 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...
Page 63 Appendix. Examples of Symptoms(T-Con) #9 Check parts by symptom Symptom Item Cause Symptom Image Name screen lower T-Con is defective and the picture below T-CON image broken the screen is broken screen lower T-Con is defective and the picture below T-CON image broken the screen is broken...
Page 64 Appendix. Examples of Symptoms(T-Con) #10 Check parts by symptom Symptom Item Cause Symptom Image Name T-CON Wafer Locking The strength is T-CON Image Broken weak and cable contact failure occurs Darkness at the Initial normal operation, T-CON top of the screen upper darkness during heat run The entire screen is dark and bit noise T-CON...
Page 65 Appendix : Exchange Power Board (PSU) #11 Check parts by symptom No Light No picture/Sound Ok A - 11/11...
Page 66 Standard Repair Process Detail Technical Manual 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...
Page 67 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Check power input voltage and ST-BY date Power P/N, Name SET Model 75QNED95/96 EAY65898111, LGP75MH-21SP Power Check Sequence 1. AC input Check : SK100 (100~240Vac) 2.
Page 68 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Content Error check by LED Indicator date LED Indicator error condition (UHD Mid/High model only) 1. LED Indicator blank in each abnormal condition (Repeat each 6sec) 2.
Page 69 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 Entry method 1. Press the IN-START button of the remote control for adjustment. 2.
Page 70 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 71 Standard Repair Process Detail Technical Manual Error Established C. Audio error_No audio/Normal video symptom date Revised Content Voltage and speaker checking method when there is no audio date [75QNED95/96] ① P201 ② ③ SPK_R-_FT SPK_R-_CT SPK_R+_FT SPK_R+_CT SPK_L-_FT SPK_L-_CT SPK_L+_FT SPK_L+_CT SPK_L-_TW SPK_R-_TW...
Page 72 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date ① Pin name LED_R IR & EYE Sensor +3.5V_ST ② EYE_SCL KEY2 EYE_SDA WOV_PDM0_DATAIN KEY1 WOV_PDM_CLKOUT Eye LED +3.5V_WIFI COMBO_RESET ③...
Page 73 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Magic Remote/WiFi operation checking method date Pin name LED_R ① Wifi & BT Front +3.5V_ST EYE_SCL KEY2 EYE_SDA ② WOV_PDM0_DATAIN KEY1 Wifi & BT Rear WOV_PDM_CLKOUT +3.5V_WIFI COMBO_RESET...
Page 74 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 1. How to access the remote control...
Page 75 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date 2. Remote control part definition POWER Power On/Off [ETC] Each time pressing the KEY button, Mode gets changed to ETC and P-ONLY each time ETC (Added Function) All KEY function [PIP PR-][PIP PR+][SWAP] [PIP INPUT][DVI] KEY Function...
Page 76 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content How to use the Service remote control date B-TOOTH Connected to Blue-Tooth (Added function) Model Nam ex) 42PG60D-NA Current Model Name S/W Version ex) V03.11.0 Current S/W version IN-START MICOM Version ex) V3.05.0 current Mi-Com version UTT ex) User TV total usage time POWER OFF STATUS ex) Shows power-off status...
Page 77 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content Check items after Main B/D replacement date Check items afer Main B/D(Model Number D/L, White Balance) 1. Press the Service remote control instart Key. No.7 Select Model Number D/L - Key in the model name and serial number after checking the ID label on the back cover.
Page 78 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content Adjustment Test pattern - ADJ Key date P-ONLY  HDMI HOT(Yellow button)  CH ‘+’ or ‘-’ You can view 11 types of patterns using the ADJ Key Checking item : 1.

LG 75QNED96TPA Service Manual

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