LG 14T90N Series Service Manual

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14T90N Series

REV. 00

2020. 01. 15

Retention period until : 2024-01

Only training and service purposes.

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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 System Block Diagram Part lists Using Hot Keys Operation Status Lamps BIOS Flash Check Secure Boot BIOS Setup Exploded view System Recovery Recovering from a Boot Failure Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 3 Check malfunctions after familiarizing yourself with the following. Notices Only a skilled person authorized by LG Electronics can repair the PCs. Before replacing any parts, you must fully familiarize yourself with the part repair procedures shown in "Part (FRU) disassembly and replacement".
Page 4 2 Depending on the type of PC, there can be a processor board and a system board. Replace each board once at a time and install it. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 6 If an electrical accident occurs, 1 Pay special attention to avoid becoming a victim yourself. 2 Turn off the power switch. 3 Ask others to request medical supports. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 LG Electronics. If there are many factors for insecurity, determine the level of risk and also whether you can proceed further without fixing the problems.
Page 8 You should handle the battery according to the regulations. You need to only use or replace with the battery in the part list. If the battery is used/replaced in an incorrect way, it can cause ignition or explosions. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 9 Backup (Standby) RTC battery safety information When replacing or disposing of the backup (standby) RTC battery, note the following : Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 10 Names of Parts Names of Parts Front 1 Webcam Operation Status Lamp 2 Webcam 3 Built-in Microphone 4 Keyboard 5 Touchpad 6 Power button [ ] (Fingerprint Sensor) Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 11 When using ear microphone (or Bluetooth headset), audio input and output are directed to the connected device and the microphone and speaker on PC do not work. The 4-pole ear microphone port does not support external microphone. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 12 Intel® AX201D2W • Manufacturers and installers cannot provide services related to human safety as this wireless device may cause radio interference. Web Camera • HD Webcam Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 13 The performance of the provided adapter depends on the model. Product Weight • Approx. 1145 g (battery included) • Weight varies by configuration and manufacturing process. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 15 Fn + Works as the [End] key. ▶ Fn + Works as the [Page Up] key. ▲ Fn + Works as the [Page Down] key. ▼ Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 16 Off: When reader mode is deactivated 7 Webcam Operation Status Lamp • On: When the webcam is operating • Off: When the webcam is not operating Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 17 To boot the system with a USB, first hit the [F2] key to enter the BIOS Setup menu and in the Boot Menu, switch the USB device to the highest booting priority or press the [F10] key when the LG logo is displayed to retrieve the Boot Menu and select the device to use next time.
Page 18 10 Press the [F2] key to enter the setup menu and check if the BIOS update is performed. In addition, check the KBC version as well. 11 In the Exit menu, select Load Setup Defaults or press the [F9] key to retrieve the initial BIOS settings. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 6 When the system is rebooted, enter the BIOS Setup menu again and check if the Secure Boot setting is as shown in the below figure. (Check UEFI Secure Boot / Protected Signatures / Secure Boot Option.) Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 2 After the restart, press the [F2] key. The booting speed is faster than the existing models. You'd better press it as soon as the system restarts. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 Specify on which driver you will first start searching for the operating system. Press the [F5], [F6] keys to change the booting sequence. • Exit: You can save the changes in the setup, or reset to the initial value. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 Ʃ Serial Number Ʃ UUID Number Ʃ Processor Type Ʃ Processor Speed Ʃ System Bus Speed Ʃ System Memory Speed Ʃ Total Memory Ʃ SATA SSD Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 23 System Information and BIOS Advanced Menu • Booting Configuration: Configure the boot settings. • MISC Configuration: Configure MISC settings. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 24 Delete all secure boot settings. • Set SSD1 Password: Set the SSD password. • TPM Support: TPM function is supported. • TPM Configuration: Set the TPM functions. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 25 [F6] key to move down the device disk. By moving the device drive up or down, you can change the priority for system booting. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 26 The item is used to revert to the previous setting without saving the changes. If you select this item, all the settings will be updated and the confirmation message will appear. If you want to revert the changes to the previous settings without saving it, select [Yes]. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 27 • To recover the system, the AC adapter must be connected. 1 Click the [ ] button and select the Settings menu. 2 When the [Settings] screen appears, select [Update & Security]. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 28 3 Select the [Recovery] menu and press [Get Started] in the Reset this PC menu. 4 If the following screen appears, select a desired option to proceed with recovery. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 29 System Recovery Keep My Files It removes the apps and their settings without loss of personal files. 1 Select [Keep my files]. 2 Check the current settings. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 30 System Recovery 3 If you need to change the settings, press [Change settings] and press the [Confirm] button. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 31 • All data is lost during the initialization, so you must backup all critical data in advance. • It may take about 5 hours or longer depending on the system conditions. 1 Select [Remove everything]. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 32 System Recovery 2 Check the current settings. 3 If you need to change the settings, press [Change settings] and press the [Confirm] button. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 34 System Recovery Recovering from a Boot Failure If you cannot boot the system due to a serious error with the system, you can recover the system using LG Recovery Center RE. CAUTION • If you have deleted the restoration data in the protected area of the hard disk, or have arbitrarily installed another operating system, the 'Restore' function may not work.
Page 35 3 When the following screen appears, select the [I Agree] button and click the Next button. 4 When the factory reset has been completed as shown in the following figure, click the [Complete] button and restart the system. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 36 The screen color can be set to cold (with a bluish tint) or warm (with a reddish tint). 1 Select [ ] > [LG Software] and run [LG Control Center]. 2 Select [System Settings] > [Color Temperature] to set the color temperature. (Cold: 4 levels, Warm: 4 levels) NOTE •...
Page 37 ] button and select the [Settings] menu. 2 When the [Settings] screen appears, select [Account] > [Sign-in options]. 3 Press the [Add] button under the [PIN] menu to set the password. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 38 • You can register up to 10 fingerprints, but registering more than 10 will reset the registration and you will have to register your fingerprint again. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 39 ] button and select the [Settings] menu. 2 When the [Settings] screen appears, select [Account] > [Sign-in options]. 3 Press the [Add] button under the [PIN] menu to set the password. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 40 • You can register up to 10 fingerprints, but registering more than 10 will reset the registration and you will have to register your fingerprint again. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 41 You can simultaneously turn on the PC and log in to Windows using the registered fingerprint. NOTE • The One Touch login function is currently only available on LG gram models. Copyright © 2020 LG Electronics Inc. All rights reserved.
Page 42 The message can be displayed sometimes because of anti fingerprint forgery function or because the fingerprint was not properly recognized. Lightly touch the fingerprint recognition device again to log in. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 44 • If the sleep mode is activated, press the power button (fingerprint recognition) again to log in to Windows and use the Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 45 1 Right click with the mouse button on the [ ] button > Run [Disk Management] > Select [Mounted Disk]. 2 Right click with your mouse > Select [New Simple Volume]. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 46 1 After pressing the [ ] button, select [Windows System] > [Control Panel] > [System and Security] > [Storage Space] > [Create a new pool and storage space]. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 47 Using the New Functions 2 Proceed to configure the drive with the newly installed disk. 3 After selecting a restoration type, you can proceed. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 48 3 Three-way mirror: Complex composition of RAID 0, 5. Needs at least five drives. 4 Parity: Corresponds to RAID 5. You can set the capacity to higher than the available disk space. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 49 • The function supports inputs of 5V@2A or more, 9V@1.6A or more, 12V@1.25A or more, 15V@1A or more, 19V@0.78A or more, and 20V@0.75A or more. • If the external power supply supports one or more of the six V@A specifications above, you can connect it to LG gram to charge LG gram.
Page 50 4 After about 10 seconds, connect the power cord and measure the output voltage of the AC adapter. 5 If the voltage is wrong, replace the AC adapter. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 51 If the voltage difference is still below the main voltage of the battery label after charging, it is necessary to replace the battery. CAUTION • Even if the charging lamp is not lit, you need to charge it for at least three hours. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 52 2 If the driver is not the latest version, uninstall the previous driver and install the latest version. 3 If the driver is properly installed, reconnect or replace the module and check whether the problem continues. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 53 11 If the speed is lowered on a particular AP or at a specific location, there is a possibility that the problem is with the particular AP, speed limit due to the number of AP users, or compatibility with the particular AP. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 54 • Numbered items should be taken care of in the order of number. • When proceeding with each numbered items, check the performance improvement. For the performance improvement, you don't need to proceed to the next steps. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 55 Check if the SODIMM memory is defective. The power supply lamp is lit and during posting, there is nothing on the LCD. c LCD assembly d System board Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 56 8 Pay special attention to avoid replacement of parts with no defects. • LCD assembly (Check repeating problems by using the external monitor.) • System board • MNT or MTV board Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 57 • Torque of 2.0 ± 0.2kgf • Cm applies when screwing on each part. • For further information on Removing and Replacing a Part(FRU), refer to Explore view. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 59 Part Disassembly and Replacement 2 Remove the 8 screws. FRU No. Specification FAB30639701 SCREW M2*4.5L Dia(4.1-4.5)_Thk(0.7-0.8) W-Ni ; NY 8 EA Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 60 • Using the plastic disassembly tool, remove the hook at the top and remove the bottom case in the direction of the arrow (pushing up). Hook Hook Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 61 1 Disconnect the 1 cable after removing the 6 screws. Cable FRU No. Specification FAB30639701 SCREW M2*4.5L Dia(4.1-4.5)_Thk(0.7-0.8) W-Ni ; NY 6 EA 2 Remove the Battery. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 62 Bottom Case (1010), b. Battery (1020) 1 Remove the 1 screw. FRU No. Specification FAB34738801 SCREW M2*2.5L K W-NI #1 NY 1 EA 2 Remove the SSD. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 63 • For SATA SSD, the same performance is supported in either slot. • For NVMe SSD, the same PCIe x4 lane (full specifications) performance is supported in either slot. Slot Slot Slot Slot Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 64 • Remove the following parts in order before replacing this part a. Bottom Case (1010), b. Battery (1020) 1 Disconnect the 2 hooks. Hook Hook 2 Remove the Memory. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 65 • Remove the following parts in order before replacing this part a. Bottom Case (1010), b. Battery (1020) 1 Remove the 2 cables.. Cable Cable 2 Remove the Speaker. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 66 1 Disconnect the 1 cable after removing the 2 screws. Cable FRU No. Specification FAB34698901 SCREW M2*3L (K) B-ZN NY #1 2 EA 2 Remove the FAN. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 67 • Remove the following parts in order before replacing this part a. Bottom Case (1010), b. Battery (1020) 1 Remove the 4 screws. 2 Remove the Heat Sink. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 68 1 Disconnect the 8 cables after removing the 4 screws. Cable Cable FRU No. Specification FAB34738901 SCREW M2*2L K B-NI #0 NY 4 EA 2 Remove the Mainboard. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 69 1 Disconnect the 3 cables after removing the 4 screws. Cable Cable FRU No. Specification FAB34698901 SCREW M2*3L (K) B-ZN NY #1 4 EA 2 Remove the IO Sub Board. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 70 1 Disconnect the 1 cable after removing the 1 screw. Cable FRU No. Specification FAB34698901 SCREW M2*3L (K) B-ZN NY #1 1 EA 2 Remove the Power Sub Board & Finger Print Button. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 71 SCREW M2*2L K B-NI #0 NY 2 EA FAB34698901 SCREW M2*3L (K) B-ZN NY #1 2 EA 2 Remove the Touch Pad & Touch Pad Cable. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 72 1 Remove the 4 screws. FRU No. Specification FAB30639701 SCREW M2*4.5L Dia(4.1-4.5)_Thk(0.7-0.8) W-Ni ; NY 4 EA 2 Remove the DC Jack and remove the Keyboard Deck & LCD Ass'y. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 74 Touch Pad & Touch Pad Cable (1110), l. DC Jack & Keyboard Deck & LCD Ass'y (1120) 1 Remove the LCD Bezel using the plastic dissolver tool. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 75 FRU No. Specification FAB34698901 SCREW M2*3L (K) B-ZN NY #1 6 EA 2 Remove the hinge assembly by pulling the cable in the direction of the arrow. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 76 Part Disassembly and Replacement 3 Remove 1 screw of the hinge assembly. FRU No. Specification FAB34758601 IMS 1.6X5 BNI+NYLOK 1 EA Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 78 1 Remove 1 screw and remove the 2 tapes. Tape Tape FRU No. Specification FAB34698901 SCREW M2*3L (K) B-ZN NY #1 1 EA 1 Remove the Antenna. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 80 Touch Pad & Touch Pad Cable (1110), l. DC Jack & Keyboard Deck & LCD Ass'y (1120), m. LCD Bezel (1130), n. Hinge &Hinge Cap(1140), q. Antenna (1150) 1 Remove the 1 Cable. Cable 2 Remove the Sensor Board. Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 82 2400 SO-DIMM 69.60 x 30.00mm FBGA BK 260P NMRY01 EAN64666001 8GB DDR4-2400Mbps 20nm 8Gb A-Die SK hynix NMRY02 MCQ70524901 TRCU RF ABSORBER 68 35, LONGYOUNG NMRY02 MHK66287801 TJ13A(00) ABSORBER 68 35, HFC Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 83 BS14(00) D-Silver BTM BOSS MYLAR HENGKUN NLCD01 ABQ77181901 BS14, Display Assy, White NLCD01 ABQ77181902 BS14, Display Assy, Silver NLCD03 MEF64541901 BS14(00) HINGE L SZS NLCD03 MEF64522101 BS14(00) HINGE L Jarlly Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 84 USB Type C 10/100 0.115M 8p,6p WHITE AWG28 NADT03 EAD63769504 N MEC IMEX INC USB Type C 10/100 0.115M 8p,6p BLACK. AWG28 NADT03 EAD63769505 N MEC IMEX INC Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 85 ID Label Clear Spain Pouch NPOUCH01 MAF64347308 14T990 Pouch Wacom Active Stylus Pen Package (Stylus Accessory NSTP01 AAA77804301 Pen+Manual+Pen Tip(2)+Tweezer+AAAA Batteryw/ KC Label+Rubber Ring+ Gift Box) Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 87 BS14 IO FPC /CMI 1.77*0.85,2L,0.2mm NSUB04 EAX68923102 BS14 IO FPC /UNIFL 1.77*0.85,2L,0.2mm NSUB05 EAD65586601 FG FFC 14P 0.5mm 45mm BS14(CVILUX) NSUB05 EAD65586602 FG FFC 14P 0.5mm 45mm BS14(MINGJI) Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 89 NKDECK03 EAD65427202 MINGJI/206-6043-0 (CLICK FFC 8P) NKDECK06 EAD65465201 OCTEK/DCW-03FDBKAB-U (DC-IN CABLE 4P) NKDECK06 EAD65505001 MECIMEX/70-5919-950HF-FA (DC-IN CABLE 4P) NKDECK07 MEG66378901 BS14(00) FP SUP BKT Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 91 MED65170801 YINGFAN/BS14(00) UMA THM ASSY Thermal NFAN01 MED65130901 KAI QI YUE/BS14(00) UMA THM ASSY Module FAN AL COVER (65.5*57*4.0 mm) DELTA/NC55C01- NFAN02 EAL62080801 17E24 Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 92 NKDECK03 EAD65427202 MINGJI/206-6043-0 (CLICK FFC 8P) NKDECK06 EAD65465201 OCTEK/DCW-03FDBKAB-U (DC-IN CABLE 4P) NKDECK06 EAD65505001 MECIMEX/70-5919-950HF-FA (DC-IN CABLE 4P) NKDECK07 MEG66378901 BS14(00) FP SUP BKT Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 93 NBOTM04 NBOTM03 NBOTM02 NBOTM04 NBOTM02 NBOTM04 NSTP01 NBOTM02 NPWCD01 NADT01 NADT02 NADT03 Lan Gender White: EAD63769504 / EAD64185903 Lan Gender Black: EAD63769505 / EAD64185904 Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 94 1.00M NONE 125V 7A VCTFK 2*0.75mm2 BLACK PSE N I-SHENG ELECTRIC WIRE AND CABLE CO., LTD.) NPWCD01 EAD30754402 USA Black 2pin NPWCD01 EAD62565303 USA White 2pin Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 95 NLAB08 MEZ68734501 LG Counseling Center Label Pouch NPOUCH01 MAF64347308 14T990 Pouch AES 2.0 Stylus Pen (Korea, USA, Canada, Spain, Japan, Accessory NSTP01 AAA78299801 China) Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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