LG 55UJ634 Series Service Manual
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LG 55UJ634 Series Service Manual

Chassis ub74p
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LED TV
SERVICE MANUAL
CHASSIS : UB74P
MODEL : 55UJ634*
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL69884711 (1710-REV03)
Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
55UJ660T
CONFIDENTIAL
55UJ634*-TD
55UJ660T-TD

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  • Page 1 SERVICE MANUAL CHASSIS : UB74P MODEL : 55UJ634* 55UJ634*-TD 55UJ660T 55UJ660T-TD CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL69884711 (1710-REV03) Copyright © 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SPECIFICATION ..................6 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 11 EXPLODED VIEW .................. 24 DISASSEMBLY GUIDE ................26 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

    SPDIF out USB Input For My Media(Movie/Photo/Music List) or For SVC Ethernet Connect(1EA) Ethernet Connect PCMCIA Card slot(1EA) PCMCIA slot Depending on model (*V-T* models) - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Cvbs Input

    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: Software Update

    (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 11: Block Diagram

    BLOCK DIAGRAM 1. EXTERNAL - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 2. INTERNAL - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 3. EPI / CEDS - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 4. TUNER - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 5. VIDEO & AUDIO IN/OUT - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 6. HDMI 2.0 - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 7. USB / WIFI / M-REMOTE / UART(Debug) - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 8. I2C Map - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 9. GPIO - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 10. GPIO(MICOM – RENESAS) - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 DC1_DQS1 / DQS1B UDQS/~UDQS K3L_DDR_0_DQS_2_P/N DC1_DQS2 / DQS2B LDQS/~LDQS K3L_DDR_0_DQS_3_P/N DC1_DQS3 / DQS3B UDQS/~UDQS K3L_DDR_0_DQ [0:15] DC1_DQ [0:15] DQ[0:15] DQ[0:15] K3L_DDR_0_DQ [16:31] DC1_DQ [16:31] - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 12. POWER - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 13. POWER 2 - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 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. - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 EXPLODED VIEW (MODULE) IMPORTANT NOTICE MRC use only * MRC : Module Repair Center - 25 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 26: Disassembly Guide

    Please do not assembled press curved portion (b) Please do assembled press Latch Zone (a). * Press direction (down from the outer surface) - 26 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 : M4*10 1EA *SCREW TORQUE : SCREW : 5 ~ 7Kgf .cm SCREW : 5 ~ 7Kgf .cm SCREW : 5 ~ 7Kgf .cm Hook Latch - 27 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 Back Cover Bottom In case it disassemble hard, you can use tool like a driver.  Insert driver into rectangle hole for disassembling B/C - 28 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 (1) Unlock screws (“1”: 1EA, ”2”: 7EA, “3”: 7EA) to separate back cover assembly from module. Detach the Side AV Label(“4”). (2) Detach the Tape(“5”). - 29 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 (3) Separate connectors (“6”) from Main/Power PCB and module. Separate Speaker(“7”: 2EA) from module. - 30 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 (4) Unlock screw (“8”: 18EA) to separate from module. *1 pole Stand Supporter (“9”: 2EA) is applied on 1pole Stand type. (5) Detach the Insulation Sheet.(“10”). - 31 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 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”). - 32 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 (8) Detach the foot rubber(“22”: 7EA) from 1pole Stand Assembly (“21”). Unlock screw (“22”: 12EA) from 1pole Stand Assembly (“21”). Separate Stand Pipe(“25”) and Metal Stand Neck(“26”) from 1pole Stand Assembly (“21”). 26 22 - 33 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 (9) Separate Stand body top(“27”) from Stand Base(“28”). - 34 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 35: Troble Shooting Guide

    TROBLE SHOOTING GUIDE...
  • Page 36 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 37 Standard Repair Process Established A. Video error Error date symptom No video/ Normal audio Revised date First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, Vx1 Cable or EPI Cable, Speaker Cable, IR B/D Cable,,,) ☞A1 ☞A18 No video...
  • Page 38 Standard Repair Process Established A. Video error Error date symptom No video/ No audio Revised date ☞A18 Check and Check various No Video/ Normal voltages of Power replace No audio voltage? Board ( 13V) MAIN B/D Replace Power Board and repair parts...
  • Page 39 Standard Repair Process Established A. Video error Error date symptom Picture broken/ Freezing Revised date . By using Digital signal level meter ☞ A3 . By using Diagnostics menu on OSD ( All Settings→ Channels→ Channel Tuning→ Manual Tuning → Signal Strength, Signal Quality) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%)
  • Page 40 Standard Repair Process Established A. Video error Error date symptom Color error Revised date ☞ A7 ☞A6 ※ Check and Check color by input replace Link -External Input Cable Color Color Color -COMPONENT Replace module Replace Main B/D error? (V by one or EPI) error? error? and contact...
  • Page 41 Standard Repair Process A. Video error Established Error date symptom Vertical / Horizontal bar, residual image, Revised date 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 42: Power Error

    Standard Repair Process Established B. Power error Error date symptom No power Revised date ☞A17 ☞A18 DC Power on Replace Check Power Check Power Normal by pressing Power Key Power On ‘”High” Logo LED LED On? operation? On Remote control .
  • Page 43 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date Check outlet ☞A19 Check Power Off Check A/C cord Error? Replace Main B/D Normal? Abnormal Mode Check for all 3- phase power out Abnormal Replace Power B/D...
  • Page 44 Standard Repair Process Established B. Power error Error date symptom Off when on, off while viewing, power auto on/off Revised date * 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 Check &...
  • Page 45 Standard Repair Process Established C. Audio error Error date symptom No audio/ Normal video Revised date ☞A20 ☞A21+A18 Check user Check audio B+ No audio Normal menu > A13V of Power Screen normal voltage Speaker off Board Cancel OFF Replace Power Board and repair parts Check Disconnection Replace MAIN Board...
  • Page 46 Standard Repair Process Established C. Audio error Error date symptom abnormal audio/ discontinuation/noise Revised date → 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 (A13V) Noise for all connector audio...

  • Page 47: Function Error

    Standard Repair Process D. Function error Established Error date symptom Remote control & Local switch checking Revised date 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 Cable connection...
  • Page 48 Standard Repair Process D. Function error Established Error date symptom Wifi operating checking Revised date 3.Wifi operating error ☞A24 ☞A4 Check the Wifi wafer Check the Wi-Fi Mac value Normal Replace is “NG”? 1pin Voltage? INSTART menu Main B/D ☞A24 Check &...
  • Page 49 Standard Repair Process Established D. Function error Error date symptom External device recognition error Revised date 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/ Check and fix DVI, Optical...
  • Page 50 Standard Repair Process Established E. Noise Error date symptom Circuit noise, mechanical noise Revised date Identify Circuit Check location noise Replace PSU noise of noise type Mechanical Check location of noise noise ※ When the nose is severe, replace the module ※...
  • Page 51 Standard Repair Process Established F. Exterior defect Error date symptom Exterior defect Revised date Zoom part with Module Replace module exterior damage damage Cabinet Replace cabinet damage Remote control Replace remote control damage Stand Replace stand dent...
  • Page 52 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 53 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 54 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 55 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 1. Press the ADJ button on the remote control for adjustment. 2. Enter into White Balance. 3.
  • Page 56 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 57 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 58 Standard Repair Process Detail Technical Manual Error Established A. Video error_Video error, video lag/stop symptom date Revised Content TUNER checking part date <Vx1 Models> <EPI Models> <SIZE: 165X183> <SIZE: 165X183> Checking method: 1. Check the signal strength or check whether the screen is normal when the external device is connected. 2.
  • Page 59 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 <Vx1 Models> <EPI Models> <SIZE: 165X183> <SIZE: 165X183> As the part connecting to the external input, check the screen condition by signal...
  • Page 60 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error symptom date Revised Content Check Link Cable(Vx1 or EPI) reconnection condition date <Vx1 Models> <EPI Models> Check the contact condition of the Link Cable, especially dust or mis insertion.
  • Page 61 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 62 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 63 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 64 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 65 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 66 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 67 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 68 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 69 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 70 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 71 Appendix : Exchange Power Board (PSU) No Light No picture/Sound Ok A - 11/11...
  • Page 72 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 73 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 Forward Symbol Unit Voltage 65UJ63 60UJ63 55UJ63 126.1 132.6 143.2 49UJ63 113.4 122.4 43UJ63 65.94 71.4...
  • Page 74 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 75: Checking Method

    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 76 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 Power board side VSYNC SCLK DRV_ON P-DIM ① A13V A13V ② PWR_ON P-DIM2 ③...
  • Page 77 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content Remote control operation checking method date +3.5V_WIFI ① WIFI_DM_JACK IR & Control Key front WIFI_DP_JACK WOL/WIFI_POWER_ON_JACK +3.5V_WIFI COMBO_RESET_JACK BT_WAKEUP_DEVICE_JACK BT_WAKEUP_HOST_JACK IR & Control Key Rear EYE_SDA EYE_SCL IR_JACK...
  • Page 78 Standard Repair Process Detail Technical Manual Error Established D. Function error symptom date Revised Content A23/A24 Remote control operation checking method date +3.5V_WIFI ① Wifi 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 Rear EYE_SDA EYE_SCL ③ IR_JACK ② LED_R_JACK +3.5V_ST KEY2_JACK...
  • Page 79 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 80 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 81 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 82 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 83 Standard Repair Process Detail Technical Manual Error Established A. Video error_Color error 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.
  • Page 84 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A 28 (1/19)

  • Page 85: Main Board

    Power Board Muitl Gender JIG Diagram (P/N: RAD33187801) <Defect diagnosis : Power Board Main Board> (LF/UF Series) (OLED) ※ 12/13/14Y Smart JIG 24Pin connector applied 24Pin 28Pin 24Pin 24Pin 18Pin (OLED) 13Y/14Y 24Pin 28Pin (OLED) 24Pin 28Pin 16Y/17Y (UH/UJ) 18Pin 28Pin 28Pin 12Pin...
  • Page 86 Power Board Muitl Gender JIG Diagnostic model List Existing 12Y, 13Y, 14Y, 15Y LED models included 15Y, 16Y, 17Y OLED, 16/17 Y LED model Power diagnosis function newly added <15Y/16Y/17Y OLED Model, 16Y/17Y LED Model> Year Product Model EG92/EG93/EG94 ‘15 OLED EG96 EF95...
  • Page 87 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. A 28 (4/19)
  • Page 88 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 89 `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 90 `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. A 28 (7/19)
  • Page 91 `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 92 `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 93 `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 94 `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 95 `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 96 `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 97 `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 98 `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 99 `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 100 `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 101 `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 102 `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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