LG 86UK7050PVA Service Manual

Chassis ub82f

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LED TV

SERVICE MANUAL

CHASSIS : UB82F

MODEL : 86UK7050PVA/YVA

CAUTION

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

P/NO : MFL70501721 (1801-REV00)

86UK6500PTB / 7150PVA

CONFIDENTIAL

Summary of Contents for LG 86UK7050PVA

Page 1 SERVICE MANUAL CHASSIS : UB82F MODEL : 86UK7050PVA/YVA 86UK6500PTB / 7150PVA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL70501721 (1801-REV00) Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 2 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 19 DISASSEMBLY GUIDE / ASSEMBLY GUIDE ........20 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 PC(HDMI Ver. 1.4), Support HDCP Audio Input DVI Audio, Component, AV SPDIF out SPDIF out USB Input For My Media(Movie/Photo/Music List) or For SVC Ethernet Connect(1EA) Ethernet Connect - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 1920*1080 33.75 60.00 74.25 HDTV 1080I 1920*1080 56.25 50.00 148.50 HDTV 1080P 1920*1080 67.43 59.94 148.50 HDTV 1080P 1920*1080 67.50 60.00 148.50 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 8 UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 134.86 59.94 593.407 UDTV 2160P UHD DEEP COLOUR ON When HDMI1,2,3 4096*2160 60.00 UDTV 2160P UHD DEEP COLOUR ON - 8 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 9 3840*2160 67.5 30.00 297.00 UDTV 2160P UHD model only 4096*2160 53.95 23.97 296.703 UDTV 2160P UHD model only 4096*2160 UDTV 2160P UHD model only - 9 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 10 (7) Click [Yes] : TV will be DC OFF → ON. and Tool Option. (8) After TV turned on, Check the updated SW Version and Tool Option. - 10 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 14 FE_DEMOD1_TS_DATA[ 7] 25 TP_DVB_DATA7 / TU_RESET1 [ RESET_DEMOD] 10 GPIO26 [ SIF] 6 AAD_ADC_SIF TU_CVBS [ CVBS] 4 CVBS_IN1 IF_AGC [ IF_AGC] 5 IFAGC - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 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. - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 (2) Remove 20 screws of marking “B”. (3) Lift B/C in bottom. * Be careful of the sharp edges * Wear gloves when working - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 Remove gasket of marking “D”. Pull out harness in Hook (marking “E”). (6) Remove 7 Screws of marking “F” Pull out harness (marking “G”) - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 (8) Remove 8 screws of marking “N”. Remove speaker (L/R) of marking “O. (9) Remove 4 Screws of marking “P” Remove Stand Supporter (marking “Q”) - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 23 Fix Screw of marking “A”. When assemble the rear cover, cover from bottom side or cover horizontally and then push the latch on upper (8 points : - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 24 * Use a tape to fix the FFC (6) Disassemble the Guide Panel. *6-piece Guide Panel (Top 2ea / Side 2ea / Down 2ea) - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 25 * 1st Attach Top Array A (6ea) * 2nd Connect A to B * 3rd Attach Bottom Array B (6 EA) * Finish the Attached LED Array - 25 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 26 TROUBLE SHOOTING GUIDE...
Page 27 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 28 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 or EPI Cable, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A18 Replace T-con/Main...
Page 29 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date 2/16 ☞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...
Page 30 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 31 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 Color Link Cable Color Color Replace module Replace Main B/D error? (EPI or Vx1 error? error? -HDMI...
Page 32 Standard Repair Process Established A. Video error 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 Check and -External Input...
Page 33 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 operation? On ‘”High” On Remote control . Stand-By: Red or Turn On .
Page 34 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 Check A/C cord Error? Replace Main B/D Normal? Abnormal Check for all 3- phase Abnormal Replace Power B/D power out Fix A/C cord &...
Page 35 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date 8/16 * 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 36 Standard Repair Process Established C. Audio error Error date symptom Revised date No audio/ Normal video 9/16 ☞A20 ☞A21+A18 Check user Check audio No audio Normal menu > 13.2V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Replace MAIN Board Disconnection...
Page 37 Standard Repair Process Established C. Audio error Error date symptom Wrecked audio/ discontinuation/noise Revised date 10/16 → 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 Noise for B+ Voltage (13.2V) connector...
Page 38 Standard Repair Process D. Function error Established Error date symptom Remote control & Local switch checking Revised date 11/16 1. Remote control(R/C) operating error Replace Main B/D ☞A22 ☞A22 ☞A22 Check & Repair Check R/C itself Normal Normal Check B+3.5V Normal Check IR Normal...
Page 39 Standard Repair Process D. Function error Established Error date symptom MR18 operating checking Revised date 12/16 2. MR18(Magic Remocon) operating error ☞A4 Turn off/on the Check the Check MR18 Press the Is show ok RF Receiver ver Normal set and press message? is “00.00”? operating?
Page 40 Standard Repair Process D. Function error Established Error date symptom Wifi operating checking Revised date 13/16 3.Wifi operating error ☞A24 ☞A4 Check the Wifi wafer Normal Replace Check the Wi-Fi Mac value Voltage? is “NG”? 1pin Main B/D INSTART menu ☞A24 Close Check &...
Page 41 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 14/16 Check technical Check External Input information Signal Technical input Replace Main B/D and Component input? - Fix information information? signal Recognition error - S/W Version HDMI/ Check and fix DVI, Optical...
Page 42 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date 15/16 Identify Check location Circuit nose Replace PSU noise of noise type Mechanical Check location noise of noise ※ When the nose is severe, replace the module ※...
Page 43 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 44 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 45 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 46 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Check LCD back light with naked eye Content date After turning on the power and disassembling the case, check with the naked eye, whether you can see light from locations.
Page 47 Standard Repair Process Detail Technical Manual Error Established error_No A. Video video/Normal audio symptom date Revised Check White Balance value Content date <ALL MODELS> Entry method 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3.
Page 48 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 MODELS>  Advanced Channels Channel Tuning Manual Tuning When the signal is strong, use the attenuator (-10dB, - 15dB, -20dB etc.)
Page 49 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content Version checking method date <ALL MODELS> 1. Checking method for remote control for adjustment Version Press the IN-START with the remote control for adjustment...
Page 50 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content TUNER checking part date Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
Page 51 Standard Repair Process Detail Technical Manual Error A. Video error _Vertical/Horizontal bar, Established symptom date residual image, light spot Revised Content connection diagram (1) date <ALL MODELS> As the part connecting to the external input, check the screen condition by signal...
Page 52 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 53 Appendix. Examples of Symptoms(Image error) Check for poor cable contact Symptom Item Cause Symptom Image Name Pin 단선 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 54 Appendix. Examples of Symptoms(Image error) 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 55 Appendix. Examples of Symptoms(Main) 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 56 Appendix. Examples of Symptoms(Main) 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 57 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 58 Appendix. Examples of Symptoms(Module) 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 59 Appendix. Examples of Symptoms(Module) 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 60 Appendix. Examples of Symptoms(Module) 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 screen...
Page 61 Appendix. Examples of Symptoms(T-Con) 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 screen lower...
Page 62 Appendix. Examples of Symptoms(T-Con) 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 63 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11...
Page 64 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 65 Standard Repair Process Detail Technical Manual Error Established B. Power error _No power symptom date Revised Check power input voltage and ST-BY 7.8V Content date Power Board Voltage / Current SET Model Power P/N, Name 86UK65 LGD EAY64908701, LGP86TJ-18U1 Power Check Sequence J3 (13.2V) P801 1.
Page 66 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 67 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 68 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 ① ② ③ SPK_R-FT SPK_R+FT Checking order when there is no audio SPK_L-FT SPK_L+FT 1.Check the contact condition of or 13.2V connector of Main Board...
Page 69 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date Pin name ① USB_DM IR & EYE Sensor USB_DP WOL/WIFI_ON COMBO_RESET BT_WAKEUP_DEVICE BT_WAKEUP_HOST IR & LOGO light Rear EYE_SDA ③...
Page 70 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date Pin name +3.5V_WIFI ① Wifi & BT Front WIFI_DM_JACK WIFI_DP_JACK WOL/WIFI_POWER_ON_JACK +3.5V_WIFI COMBO_RESET_JACK BT_WAKEUP_DEVICE_JACK BT_WAKEUP_HOST_JACK Wifi & BT Rear EYE_SDA_JACK EYE_SCL_JACK ③...
Page 71 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...
Page 72 Standard Repair Process Detail Technical Manual Error Established D. Function error 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 73 Standard Repair Process Detail Technical Manual Error Established D. Function error 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 74 Standard Repair Process Detail Technical Manual Error Established D. Function error 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 75 Standard Repair Process Detail Technical Manual Error Established E. Etc symptom date Revised Content Adjustment Test pattern - ADJ Key date You can view 6 types of patterns using the ADJ Key Checking item : 1. Defective pixel 2. Residual image 3.
Page 76 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 20 (1/19)
Page 77 Power Board Muitl Gender JIG Diagram (P/N: RAD33187801) <Defect diagnosis : Power Board Main Board> (LF/UF Series) (OLED) (OLED B6) 24Pin 24Pin 28Pin 24Pin 24Pin 18 Marking check 18Pin (OLED) New JIG 24Pin 13Y/14Y 28Pin No Marking OLD JIG 17/18Y 17Y/18Y (OLED) 24Pin...
Page 78 Power Board Muitl Gender JIG Diagnostic model List Existing 12Y, 13Y, 14Y, 15Y LED models included 15Y, 16Y, 17Y/18Y OLED, 16/17/18 Y LED model Power diagnosis function newly added <15Y/16Y/17Y/18Y OLED Model, 16Y/17Y/18Y LED Model> Year Product Model EG92/EG93/EG94 ‘15 OLED EG96 EF95...
Page 79 Power Board Muitl Gender How to Connect ▶ Power Board Muitl Gender JIG “A: 2013 LCD POWER” 2014 ▶ Connect the Muiti Gender to the connector (black) as shown in picture 2 of the Smart JIG. A20 (4/19)
Page 80 Smart Jig Voltage Setting ▶ Switch the product S/W in JIG to LCD. ▶ LCD MODEL Check the power voltage and switch to the correct voltage. ▶ Check power board voltage. ※ Note on set up (The correct power diagnosis can be made only if it is set correctly.) - 24V Power Board : Change the switch to 24V of Smart Jig Voltage - 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...
Page 81 `15Y OLED(EG96,EF95,EG92,EG93,EG94) Power Board Diagnostic method (1) ▶ Switch the product S/W in JIG to LCD. ▶ LCD MODEL Check the power voltage switch(24V) to the correct voltage. ▶ Check power board voltage. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶...
Page 82 `15Y OLED(EG96,EF95,EG92,EG93,EG94) Power Board Diagnostic method (2) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ When the NG LED turns on, the Power Board can be judged as defective. A20 (7/19)
Page 83 `16Y OLED(B6) Power Board Diagnostic method ▶ Switch the LCD MODEL S/W to by checking the power voltage. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ Connect the 24Pin Power Cable connector to the Multi gender JIG 24Pin connector. ▶...
Page 84 `16Y OLED(C6) Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Smart JIG: Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 85 `16Y OLED(E6) Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 86 `16Y OLED(G6) Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 87 `17Y OLED(B7/C7/E7/G7) Power Board Diagnostic method ▶ Disconnect the Main Board 28Pin Power Cable connector. ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ Switch the LCD MODEL S/W to by checking ▶ When the OK LED(24V,12V) turns on, Power Board is normal. the power voltage.
Page 88 `17Y OLED(W7) Power Board Diagnostic method ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ Switch the LCD MODEL S/W to 20V by checking ▶ When the OK LED(24V,12V) turns on, Power Board is normal. the power voltage.
Page 89 `16Y/`17Y LED 18Pin Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 18Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 90 `16Y LED(UH95/UH96) Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 28Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK(24V,12V) LED turns on, Power Board is normal. ▶...
Page 91 `16Y/`17Y LED(UH85/UH93) Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 28Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 92 `16Y/`17Y LED 12Pin Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 12Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 93 `16Y LED 12Pin Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 12Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 24V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...
Page 94 `17Y LED 28Pin Power Board Diagnostic method ▶ Check power board voltage. ▶ Disconnect the Main Board 28Pin Power Cable connector. ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶...

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LG 86UK7050PVA Service Manual

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