LG 75SM9400PTA Service Manual
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LG 75SM9400PTA Service Manual

Chassis ub92m
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LED TV
SERVICE MANUAL
CHASSIS : UB92M
MODEL : 75SM9400PTA
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL71442806 (1903-REV00)
Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
75SM9000PVA
CONFIDENTIAL

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Summary of Contents for LG 75SM9400PTA

  • Page 1 LED TV SERVICE MANUAL CHASSIS : UB92M MODEL : 75SM9400PTA 75SM9000PVA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71442806 (1903-REV00) Copyright © 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 2 SOFTWARE UPDATE ................10 BLOCK DIAGRAM ................. 12 EXPLODED VIEW .................. 21 DISASSEMBLY GUIDE / ASSEMBLY GUIDE ........22 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

    DVI Audio, Component, AV 10 SPDIF out Optical Audio out Head phone out Antenna, HDMI1, HDMI2, HDMI3, HDMI4 USB1, USB2, USB3 Except UB93x 12 Ethernet Connect - 6 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 7: Component Input

    HDTV 1080P 1920*1080 33.71 29.97 79.12 HDTV 1080P 1920*1080 33.75 79.2 HDTV 1080P 1920*1080 56.25 148.5 HDTV 1080P 1920*1080 67.43 59.94 148.35 HDTV 1080P - 7 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 8K Model Only. This will 7680*4320 131.87 29.97 1188 be added in USERGUIDE after 8K model develop- 7680*4320 1188 ment. 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 2560*1440 497.7 7680*4320 107.89 23.98 1188 7680*4320 1188 7680*4320 1188 7680*4320 131.87 29.97 1188 7680*4320 1188 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: Usb Download

    (7) Click [Yes] : TV will be DC OFF → ON. (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 (2) TV will automatically check for updates when every TV boots. When an updated is detected, the TV will issue an Alert letting the user - 11 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 12: Main Circuit

    BLOCK DIAGRAM 1. MAIN CIRCUIT - 12 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 2. I2C - 13 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 3. POWER - 14 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 SADC_I_INN [ I[ N] ] 60 DMD_SADC_INN_I Q_N_TU FILTER SADC_Q_INN [ Q[ N] ] 61 DMD_SADC_INN_Q Q_P_TU SADC_Q_INP [ Q[ P] ] 62 DMD_SADC_INP_Q - 15 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 16 5. VIDEO / AUDIO IN - 16 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 17: Audio Out

    6. AUDIO OUT AMP_MUTE SIDE_HP_MUTE - 17 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 7. HDMI CEC_REMOTE - 18 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 8. USB / WIFI / M-REMOTE / UART - 19 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 9. EPI 68 Pin INTERFACE - 20 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: 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. Do not modify the original design without permission of manufacturer. - 21 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 (remove direction : under → upper) (remove direction : under → upper) Right Left Hera Hera Hera Hera Hera Hera <Step2> <Step1> <Step3> <Step3> <Step1> <Step2> - 22 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 Hera (6) Two people grasp B/C, and remove B/C. (Grasp position : 600~800mm) (7) B/C Handling is refer to B/C Handling Guide. <Step1> <Step2> - 23 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 - Stand and Top middle Shoulder width 600mm Grasp. (UF85 Applied method) - 2 people set up : 4-corner Handling ▪ Two people Handling Guide (NG) - 24 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 (3)Assemble the Screw of B/C and Stand. 75SM90 Stand Screw : 4 Point 75SM90 Holder 10 Points 75SM90 Screw 16 Points 75SM90 Latch 3 Points - 25 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 (1) Remove all screw of bottom bracket and IR/Wifi Cable at P4000. (2) Remove Brackets with IR, Wifi/BT Assy. Screw point (3) Remove all sort of cable. Disassemble Cables in the supporter holder. - 26 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 (4) Screw disassembly Screw point (5) Speaker disassembly (6) Stand Supporter disassembly Screw point - 27 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 28: Disassembly Guide

    (4) Reverse the module and disassemble Guide Panel 5 screws * Two people should hold the left/right each side and reverse it. *Fix the S-PCB to Panel(use the tape) . - 28 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 About 340mm (7) Panel and Guide Panel disassembly (use adsorber) (8) Removal of Sheets and DP Sheet Down * Sheet 2 EA, DP 1 EA - 29 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 *Be careful not to damage the reflector sheet (11) Removal of LED Array *Press the CNT of extension B/D and then remove the LED array at an angle - 30 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 31: Assembly Guide

    * Assemble the reflector sheet bellow the lens with your fingers * In the case of corner and center, place the side marked UP on top. (3) Assemble the DPS(28 EA). - 31 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 (5) Assemble the Panel and Guide Panel(use adsorber). * Assemble the upper left/right first and assemble the bottom left/right (6) Assemble the Guide Panel hook. - 32 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 *Then assemble T-Con FFC and Cover shield (10) Assemble the guide panel. * Assemble the Screws * Assemble Pad of 4Corner (Reuse). UP L/R Down L/R - 33 - Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 34: Troubleshooting Guide

    TROUBLE SHOOTING GUIDE Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 35 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 36 ☞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 37 ☞A9 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 38 1. Reconnection 2. Install Booster S/W Upgrade Contact with signal distributor Normal or broadcaster (Cable or Air) Picture? Normal Picture? Replace Main B/D Close Close Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 39 Device/Cable Replace Main/T-con B/D error cable normal Request repair for external device/cable Check external External HDMI device and Replace Main/T-con B/D device/Cable error cable normal Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 40 Replace (Check normal operation of screen? 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 41: 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? ☞A9 Replace Power B/D Replace Power Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 42 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 43 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 44 Screen normal of Power Board voltage Speaker off Cancel OFF Replace Power Board and repair parts Check Speaker Disconnection Replace MAIN Board disconnection Replace Speaker Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 45 (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 46: 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 47 Replace MR19 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 48 Voltage? +3.5V_WiFi Main B/D INSTART menu ☞A15 Close Check & Repair Wifi cable connection ☞A4 Wi-Fi Mac Close value is “NG”? Change the Wifi assy Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 49 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 50 “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 51 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 52 Exchange Module (1) ~ (3) A-6/11 ~ 8/11 Module Exchange T-Con (1) ~ (2) A-9/11 ~ 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 53 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 54 Check Back Light On with naked eye Content date If the Black light LED assemble is ‘OK’, you can see the lights on each points. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 55 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 56  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 57 Revised Version checking method Content date 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 58 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 59 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 60 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. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 61 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 62 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 63 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 64 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 65 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 66 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 67 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 68 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 69 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 70 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 71 Appendix : Exchange Power Board (PSU) #11 Check parts by symptom No Light No picture/Sound Ok A - 11/11 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 72 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 73 5. LED voltage Check : P202 (VLED pin) Voltage Rated Current [A] Variable range [V] 61.2V (56.2~72V) 3.6A (0~3.6A) SK100 (AC input) All condition meets, Power Board OK. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 74 LED blank 7 times Local data error (Checksum & Data Length) Edge, Slim Direct V-sync signal error LED blank 8 times V-sync signal is low Edge, Slim Direct Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 75 POWER OFF MODE checking method date 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 76: 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 77 3. Connect the tester RX1 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 78 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 79 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 80 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 Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 81 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 82 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 83 - 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 84 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 85 Smart JIG Power Diagnosis Muitl Gender Guide (P/N : RAD32507801) (P/N : RAD33187801) A21 (1/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

  • Page 86: Main Board

    24 Marking Check UK74,UK75 28Pin 28Pin 12Pin 12Pin 28Pin UK77,UK78 Cable Connection SK79 Includes 49UJ63 SM86 16/18Y/19Y 16Y/17Y 17Y/18Y 16Y/17Y/18Y/19Y (UH) (UH/SJ) (SJ/UJ/UK/SK) (UH/UK/UM A21 (2/19) (LH/LJ/LK/LM) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 87 LJ61/LJ68, LJ55/LJ58 SK80/SK85/SK95 UK78/UK75/UK77/SK79 ‘18 UK63/UK64/UK65/UK68/UK7050 LK57, 32/43/49LK54, 32LK61/62, 43/49LK61 ‘18 OLED B8, C8, E8, G8, W8 SM86/90/98 ‘19 UM73/UM74/UM76/UM79 LM63 ‘19 OLED C9/E9 A21 (3/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 88 “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 89 - 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 90 ▶ Disconnect the Main Board 24Pin Power Cable connector. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A21 (6/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 91 ▶ 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. A21 (7/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 92 ▶ 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. A21 (8/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 93 ▶ When the OK LED(24V,12V) turns on, Power Board is normal. ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector A21 (9/19) Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 94 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (10/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 95 ▶ Connect the 24Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (11/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 96 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (12/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 97 ▶ When the NG LED turns on, the Power Board ▶ Fix the LCD MODEL switch to 20V.(Smart JIG) A21 (13/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 98 ▶ Connect the 18Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (14/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 99 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (15/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 100 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (16/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 101 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 12Pin connector ▶ When the NG LED turns on, the Power Board A21 (17/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 102 ▶ Connect the 12Pin Power Cable connector to the Muitl Gender JIG 24Pin connector ▶ When the NG LED turns on, the Power Board A21 (18/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...
  • Page 103 ▶ Connect the 28Pin Power Cable connector to the Muitl Gender JIG 28Pin connector ▶ When the NG LED turns on, the Power Board A21 (19/19) can be judged as defective. Copyright © 2019 LG Electronics. Inc. All rights reserved. Only for training and service purposes...

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