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Lenovo ThinkSmart Hub, Руководство по техническому обслуживанию аппаратной части

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2.  Remove the thermal pad.

Removal step

Wi-Fi card

Prerequisite

Before you start, read Chapter 1 “Important safety information” on page 1 and print the following 
instructions.

For access: 

1.  Remove the following FRUs in order: 

•  “Bottom cover” on page 52

•  “Bottom chassis” on page 53

2.  Remove the Wi-Fi card pad.

Chapter 6

.

Hardware removal and installation

55

Содержание ThinkSmart Hub

Страница 1: ...ThinkSmart Hub Hardware Maintenance Manual ...

Страница 2: ... Lenovo 2020 LIMITED AND RESTRICTED RIGHTS NOTICE If data or software is delivered pursuant to a General Services Administration GSA contract use reproduction or disclosure is subject to restrictions set forth in Contract No GS 35F 05925 ...

Страница 3: ...problems 38 Microsoft Teams Rooms problems 38 Zoom Rooms System problems 38 Screen problems 39 Audio problems 40 Storage drive problems 40 External monitor problems 41 Network problems 41 Performance problems 42 USB device problems 43 Diagnostics 43 Lenovo diagnostic tools 43 UEFI diagnostic program 43 Recovery 44 Restore system files and settings to an earlier point 44 Restore your files from a b...

Страница 4: ...Chapter 7 Notices and trademarks 73 ii ThinkSmart Hub Hardware Maintenance Manual ...

Страница 5: ...advanced diagnostic tests to troubleshoot problems Important This manual is intended only for trained service technicians who are familiar with ThinkSmart Hub Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively Before servicing a ThinkSmart Hub be sure to read and understand Chapter 1 Important safety information on page 1 Copyright Lenovo 2020 iii ...

Страница 6: ...iv ThinkSmart Hub Hardware Maintenance Manual ...

Страница 7: ...p over it Do not wear loose clothing that can be trapped in the moving parts of a machine Ensure that your sleeves are fastened or rolled up above your elbows If your hair is long fasten it Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip approximately 8 centimeters 3 inches from the end Do not wear jewelry chains metal frame eyeglasses or metal faste...

Страница 8: ...ion If you need to work on a machine that has exposed electrical circuits observe the following precautions Ensure that another person familiar with the power off controls is near you Remember Another person must be there to switch off the power if necessary Use only one hand when working with powered on electrical equipment keep the other hand in your pocket or behind your back Remember There mus...

Страница 9: ...onsider these conditions and the safety hazards they present Electrical hazards especially primary power primary voltage on the frame can cause serious or fatal electrical shock Explosive hazards such as a damaged CRT face or bulging capacitor Mechanical hazards such as loose or missing hardware The guide consists of a series of steps presented in a checklist Begin the checks with the power off an...

Страница 10: ...ive and retains a charge even when you are wearing a wrist strap Use the black side of a grounded work mat to provide a static free work surface The mat is especially useful when handling ESD sensitive devices Select a grounding system such as those listed below to provide protection that meets the specific service requirement Note The use of a grounding system is desirable but not required to pro...

Страница 11: ...ct and disconnect cables as described in the following tables when installing moving or opening covers on this product or attached devices To Connect To Disconnect 1 Turn everything OFF 2 First attach all cables to devices 3 Attach signal cables to connectors 4 Attach power cords to outlet 5 Turn device ON 1 Turn everything OFF 2 First remove power cords from outlet 3 Remove signal cables from con...

Страница 12: ...cts contain an embedded Class 3A or Class 3B laser diode Note the following Laser radiation when open Do not stare into the beam do not view directly with optical instruments and avoid direct exposure to the beam 18 kg 37 lb 32 kg 70 5 lb 55 kg 121 2 lb CAUTION Use safe practices when lifting CAUTION The power control button on the device and the power switch on the power supply do not turn off th...

Страница 13: ...Chapter 1 Important safety information 7 ...

Страница 14: ... 18 kg 37 lb 32 kg 70 5 lb 55 kg 121 2 lb 1 2 8 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 15: ... os cabos conforme descrito na tabela apresentada a seguir ao instalar mover ou abrir tampas deste produto ou de dispositivos conectados Para Conectar Para Desconectar 1 DESLIGUE Tudo 2 Primeiramente conecte todos os cabos aos dispositivos 3 Conecte os cabos de sinal aos conectores 4 Conecte os cabos de alimentação às tomadas 5 LIGUE os dispositivos 1 DESLIGUE Tudo 2 Primeiramente remova os cabos ...

Страница 16: ...odo de laser integrado da Classe 3A ou da Classe 3B Observe o seguinte Radiação a laser quando aberto Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e evite exposição direta ao feixe 18 kg 37 lb 32 kg 70 5 lb 55 kg 121 2 lb CUIDADO Utilize procedimentos de segurança para levantar equipamentos CUIDADO O botão de controle de alimentação do dispositivo e o botão para ligar de...

Страница 17: ...Chapter 1 Important safety information 11 ...

Страница 18: ...1 2 12 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 19: ...Chapter 1 Important safety information 13 ...

Страница 20: ...lisez qu une seule main pour connecter ou déconnecter les câbles d interface Ne mettez jamais un équipement sous tension en cas d incendie ou d inondation ou en présence de dommages matériels Avant de retirer les carters de l unité mettez celle ci hors tension et déconnectez ses cordons d alimentation ainsi que les câbles qui la relient aux réseaux aux systèmes de télécommunication et aux modems s...

Страница 21: ...ropriée Ne pas la jeter à l eau l exposer à des températures supérieures à 100 C chercher à la réparer ou à la démonter Ne pas mettre la pile à la poubelle Pour la mise au rebut se reporter à la réglementation en vigueur ATTENTION Si des produits à laser tels que des unités de CD ROM de DVD ROM des unités à fibres optiques ou des émetteurs sont installés prenez connaissance des informations suivan...

Страница 22: ...anliegen Aus Sicherheitsgründen Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen Ferner keine Installations Wartungs oder Rekonfigurationsarbeiten durchführen Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt anschließen Alle angeschlossenen Geräte ebenfalls an Schutzkontaktsteckdosen mit ordnungsgemäß geerdetem Schutzkontakt anschließen Die Signalka...

Страница 23: ...atterie nur durch eine Batterie mit der Teilenummer 45C1566 oder eine gleichwertige vom Hersteller empfohlene Batterie ersetzen Enthält das System ein Modul mit einer Lithiumbatterie dieses nur durch ein Modul desselben Typs und von demselben Hersteller ersetzen Die Batterie enthält Lithium und kann bei unsachgemäßer Verwendung Handhabung oder Entsorgung explodieren Die Batterie nicht mit Wasser i...

Страница 24: ...en der Maschine beachten ACHTUNG Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein Um die Stromversorgung für die Einheit vollständig zu unterbrechen müssen alle zum Gerät führenden Netzkabel vom Netz getrennt werden 1 2 18 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 25: ...Chapter 1 Important safety information 19 ...

Страница 26: ...ICOLO La corrente elettrica proveniente dai cavi di alimentazione del telefono e di comunicazione può essere pericolosa Per evitare il rischio di scosse elettriche 20 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 27: ...chiature 2 Innanzitutto collegare tutti i cavi alle unità 3 Collegare i cavi di segnale ai connettori 4 Collegare i cavi di alimentazione alla presa 5 Accendere l unità 1 SPEGNERE le apparecchiature 2 Innanzitutto rimuovere i cavi di alimentazione dalla presa 3 Rimuovere i cavi di segnale dai connettori 4 Rimuovere tutti i cavi dalle unità ATTENZIONE Quando si sostituisce la batteria al litio util...

Страница 28: ... segue Aprendo l unità vengono emesse radiazioni laser Non fissare il fascio non guardarlo direttamente con strumenti ottici ed evitare l esposizione al fascio 18 kg 32 kg 55 kg ATTENZIONE Prestare attenzione nel sollevare l apparecchiatura ATTENZIONE Il pulsante di controllo dell alimentazione presente sull unità e l interruttore dell alimentatore non disattivano l alimentazione corrente fornita ...

Страница 29: ...Chapter 1 Important safety information 23 ...

Страница 30: ...ión mantenimiento o reconfiguración de este producto durante una tormenta eléctrica Conecte todos los cables de alimentación a tomas de corriente debidamente cableadas y conectadas a tierra Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente debidamente cableadas Siempre que sea posible utilice una sola mano para conectar o desconectar los cables de señal 2...

Страница 31: ...ispositivos PRECAUCIÓN Cuando sustituya una batería de litio utilice solamente una batería número de pieza 45C1566 u otra de tipo equivalente recomendada por el fabricante Si su sistema dispone de un módulo que contiene una batería de litio reemplácelo sólo con el mismo tipo de módulo del mismo fabricante La batería contiene litio y puede explotar si no se utiliza manipula o desecha correctamente ...

Страница 32: ...pte procedimientos seguros al levantar el equipo PRECAUCIÓN El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de alimentación no desconectan la corriente eléctrica suministrada al dispositivo Además el dispositivo podría tener más de un cable de alimentación Para suprimir toda la corriente eléctrica del dispositivo asegúrese de que todos los cables d...

Страница 33: ... before replacing a solid state drive This will cause all customer data on the drive to be lost Ensure that the customer has a current backup of the data before you perform this task Attention The drive startup sequence in the hub you are servicing might have been changed Be extremely careful during write operations such as copying saving or formatting If you select an incorrect drive data or prog...

Страница 34: ...ts of a 4 character MT a 4 character model and a numeric 2 character country code is provided to the customer to place orders example 20AA000955 The country code assigned is numeric and does not designate a specific country or region The custom model factsheet for the MTM indicates which country the special bid MTM is set up for Special bid offering is not generally announced Standard model Standa...

Страница 35: ... cycle then solid End a call meeting Breathing green Spinning green Receive a call Breathing green Blinking green Hold a call NA White ring growing Volume up NA White ring shrinking Volume down Breathing blue Blinking blue Claiming mode Breathing red for three times Blinking red for three times Wrong PIN password Breathing red Blinking red Claiming error Add your hub to ThinkSmart Manager For more...

Страница 36: ...b is not in a meeting and no one is in the room the hub will go into standby mode automatically When someone comes in front of the sensor within 3 meters the hub will automatically wake up from standby mode 30 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 37: ... not receive the correct response proceed to step 6 on page 31 If you do receive the correct response proceed to step 7 on page 31 6 Look at the following conditions and follow the instructions If the hub displays a POST error go to POST error codes on page 33 If the hub hangs and no error is displayed continue at step 7 on page 31 7 Run the Diagnostic programs See Diagnostics on page 43 If you re...

Страница 38: ...ymptom to FRU index The Symptom to FRU index lists error symptoms and possible causes The most likely cause is listed first Always begin with Service checkout on page 31 This index can also be used to help you decide which FRUs to have available when servicing a hub If you are unable to correct the problem using this index go to Undetermined problems on page 36 Notes The Symptom to FRU index is no...

Страница 39: ...ST detects a problem an error message appears on the screen A single problem might cause several error messages to appear When you correct the cause of the first error message the other error messages probably will not appear on the screen the next time Error code POST error message Description Action 0135 CPU fan failure System fan failure Power fan failure Front fan failure Rear fan failure Auxi...

Страница 40: ...is error message is displayed when the PCIe PCI MMIO memory mapped input output resources are insufficient Remove some add in cards Miscellaneous error conditions Message Symptom FRU Action Changing display colors Display Monitor Hub will not power off 1 Power Switch 2 System Board Hub will not RPL from server 1 Ensure that the network is in startup sequence as the first device or the first device...

Страница 41: ...disk or disk error type message with a known good diagnostic diskette 1 Diskette Drive 2 System Board 3 Diskette Drive Cable Other display symptoms not listed above including blank or illegible display 1 Display 2 System Board Power on indicator or hard disk drive in use light not on but hub works correctly 1 Power switch LED assembly 2 System Board Printer problems 1 Printer 2 System Board Progra...

Страница 42: ...able 3 System Board Undetermined problems This section provides instructions on how to find out the failing devices or adapters 1 Turn off the hub 2 Remove or disconnect the following components if installed one at a time a External devices modem printer or mouse b Any adapters c Memory modules d Extended video memory e External Cache f External Cache RAM g Hard disk drive h Diskette drive 3 Turn ...

Страница 43: ... on page 44 5 If the problem persists contact Lenovo Frequently asked questions How to use dual display content camera or any other features in Microsoft Teams Rooms Go to https docs microsoft com en us MicrosoftTeams rooms rooms deploy and then locate the section you need How to fix system config out of date virtual keyboard missing or any other issues in Microsoft Teams Rooms Go to https docs mi...

Страница 44: ...not running in China The camera cannot be turned on in a meeting Ensure that the account has been granted the authority to use the camera Ensure that the camera can work in administrator account with Camera application Ensure that the camera is not configured as content camera The calendar is not displayed Ensure that the account has been granted the authority to receive meeting invitations automa...

Страница 45: ... persists turn off the hub Then adjust the placement of the hub and other devices so that they are at least 305 mm 12 inches apart Turn on the hub Reset the refresh rate 1 Right click a blank area on the desktop 2 Click Display settings On the Display tab click Advanced display settings Display adapter properties for Display 1 3 Click the Monitor tab and then reset the refresh rate to be the highe...

Страница 46: ...or the internal speaker if present is disabled In most cases if an audio adapter is installed in one of the expansion slots the audio function built into the system board is disabled Therefore you must use the audio connectors on the audio adapter Ensure that the audio device is configured as default speaker Ensure that the audio device drivers are correctly installed The sound does not come from ...

Страница 47: ...ry for your network environment Check with your LAN administrator for the necessary networking software Set the same duplex for the switch port and the adapter If you configured the adapter for full duplex ensure that the switch port is also configured for full duplex Setting a wrong duplex mode might degrade performance cause data loss or result in lost connections When a Gigabit Ethernet model h...

Страница 48: ...her devices 3 Turn on the Bluetooth switch to enable the Bluetooth feature Update or reinstall the Bluetooth driver Sound does not come from the Bluetooth headset or headphones Select the Bluetooth headset or headphones as the default audio output device in advanced sound settings Performance problems Problem Solution The free storage drive space is insufficient Clean out your Inbox Sent Items and...

Страница 49: ...ovo diagnostic tools For information about Lenovo diagnostic tools go to https pcsupport lenovo com lenovodiagnosticsolutions UEFI diagnostic program A UEFI diagnostic program is preinstalled on the hub It enables you to test memory modules and internal storage devices view system information and check and recover bad sectors on internal storage devices To run the UEFI diagnostic program do the fo...

Страница 50: ...ystem Restore Then follow the on screen instructions Restore your files from a backup Note If you use the File History tool to restore your files from a backup ensure that you backed up your data earlier with the tool 1 Go to Control Panel and view by large icons or small icons 2 Click File History Restore personal files Then follow the on screen instructions Reset your hub In the resetting proces...

Страница 51: ...capacity of at least 16 GB The actual USB capacity required depends on the size of the recovery image 3 Connect the prepared USB drive to the hub 4 Type recovery in the search box Then click Create a recovery drive 5 Click Yes in the User Account Control window to allow the Recovery Media Creator program to start 6 In the Recovery Drive window follow the on screen instructions to create a recovery...

Страница 52: ...essary drivers and software From Windows Update Note The device drivers provided by Windows Update might not be tested by Lenovo It is recommended that you get device drivers from Lenovo 1 Open the Start menu 2 Click Settings Update Security Windows Update 3 Follow the on screen instructions 46 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 53: ...ion slot cover or other unpainted metal surface on the hub for at least two seconds This reduces static electricity from the package and your body before you install or replace a new part When possible remove the new part from the static protective package and install it directly in the hub without setting the part down When this is not possible place the static protective package on a smooth leve...

Страница 54: ...s or by trained service technicians at an additional cost Optional service CRUs Refer to parts that can be installed or replaced by customers with a greater skill level Trained service technicians can also provide service to install or replace the parts under the type of warranty designated for the customer s machine FRUs Refer to parts that must be installed or replaced only by trained service te...

Страница 55: ...CRU Optional service CRU 1 System fan screws 6 No No 2 3 System fan No No 4 Heat sink No No 5 Thermal pad No No 6 M 2 solid state drive No No 7 Wi Fi card shield No No 8 Wi Fi card No No Chapter 6 Hardware removal and installation 49 ...

Страница 56: ...le No No 23 Infrared board No No 24 LED cable No No 25 LED board No No 26 LED lens No No 27 HDMI in board holder No No 28 HDMI FPC cable No No 29 HDMI in board No No 30 Thermal sensor cable No No 31 Mechanical chassis No No 32 Skype board bracket No No 33 Bottom chassis No No 34 Bottom cover No No 35 Cable lock box Yes No 36 One cable Yes No a Power adapter Yes No b Power cord Yes No e Miscellaneo...

Страница 57: ...d System board 1 M 2 solid state drive slot 2 Wi Fi card slot 3 Ethernet connector 4 BTB connector 5 USB connector 6 USB C connector 7 USB connector 8 DP connector 9 Power connector Chapter 6 Hardware removal and installation 51 ...

Страница 58: ...rnal options to your hub such as external speakers a printer or a scanner For some external options you must install additional software in addition to making the physical connection When installing an external option see Chapter 3 Product Overview on page 29 to identify the required connector Then use the instructions that come with the option to help you make the connection and install any requi...

Страница 59: ...r facing up Removal step Bottom chassis Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions For access remove the bottom cover See Bottom cover on page 52 Chapter 6 Hardware removal and installation 53 ...

Страница 60: ...id state drive only for upgrade or repair The M 2 solid state drive is not designed for frequent changes or replacement Before replacing the M 2 solid state drive make a backup copy of all the data that you want to keep Do not touch the contact edge of the M 2 solid state drive Otherwise the M 2 solid state drive might get damaged Do not apply pressure to the M 2 solid state drive Do not make the ...

Страница 61: ...ou start read Chapter 1 Important safety information on page 1 and print the following instructions For access 1 Remove the following FRUs in order Bottom cover on page 52 Bottom chassis on page 53 2 Remove the Wi Fi card pad Chapter 6 Hardware removal and installation 55 ...

Страница 62: ...following instructions The heat sink might be very hot Before you open the bottom cover turn off the hub and wait several minutes until the hub is cool For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 56 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 63: ... safety information on page 1 and print the following instructions For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 Chapter 6 Hardware removal and installation 57 ...

Страница 64: ...Removal steps 58 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 65: ...nformation on page 1 and print the following instructions For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 Chapter 6 Hardware removal and installation 59 ...

Страница 66: ...n page 1 and print the following instructions For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 Video capture card on page 59 60 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 67: ...al sensor cable Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions For access remove the following FRUs Chapter 6 Hardware removal and installation 61 ...

Страница 68: ... System fan Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 Video capture card on page 59 Skype board on page 60 62 ThinkSmart Hub Hardware Mainten...

Страница 69: ... and print the following instructions For access remove the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 Video capture card on page 59 Skype board on page 60 Chapter 6 Hardware removal and installation 63 ...

Страница 70: ... the following FRUs Bottom cover on page 52 Bottom chassis on page 53 M 2 solid state drive on page 54 Wi Fi card on page 55 System board and heat sink on page 56 HDMI in board on page 57 Video capture card on page 59 Skype board on page 60 Thermal sensor cable on page 61 System fan on page 62 Skype board bracket on page 63 64 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 71: ...fore you start read Chapter 1 Important safety information on page 1 and print the following instructions For access remove the Mechanical chassis See Mechanical chassis on page 64 Removal step Chapter 6 Hardware removal and installation 65 ...

Страница 72: ...nical chassis on page 64 LCD panel on page 65 Removal step Internal microphones Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions For access 1 Remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 2 Remove the internal microphones cable 66 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 73: ...int the following instructions For access remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 Removal step Wi Fi antenna cables Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions Chapter 6 Hardware removal and installation 67 ...

Страница 74: ...emoval step Hinge pipe Prerequisite Before you start read Chapter 1 Important safety information on page 1 and print the following instructions For access remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 LCD back cover on page 67 Removal steps 68 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 75: ...ty information on page 1 and print the following instructions For access 1 Remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 LCD back cover on page 67 Hinge pipe on page 68 2 Remove the LED cable Removal steps Chapter 6 Hardware removal and installation 69 ...

Страница 76: ...ormation on page 1 and print the following instructions For access remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 LCD back cover on page 67 Hinge pipe on page 68 LED board and LED lens on page 69 Removal steps 70 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 77: ... 1 and print the following instructions For access remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 LCD back cover on page 67 Hinge pipe on page 68 LED board and LED lens on page 69 Internal speakers on page 70 Removal step Chapter 6 Hardware removal and installation 71 ...

Страница 78: ... print the following instructions For access remove the following FRUs Mechanical chassis on page 64 LCD panel on page 65 LCD back cover on page 67 Hinge pipe on page 68 LED board and LED lens on page 69 Internal speakers on page 70 Infrared board on page 71 72 ThinkSmart Hub Hardware Maintenance Manual ...

Страница 79: ...ed with your hub and the content of the manual at any time without additional notice The software interface and function and hardware configuration described in the manuals included with your hub might not match exactly the actual configuration of the hub that you purchase For the configuration of the product refer to the related contract if any or product packing list or consult the distributor f...

Страница 80: ...e this document at any time without notice For the latest information or any questions or comments contact or visit the Lenovo Web site https pcsupport lenovo com Trademarks LENOVO LENOVO logo THINKSMART and THINKSMART logo are trademarks of Lenovo Microsoft and Windowsa are trademarks of the Microsoft group of companies The terms HDMI and HDMI High Definition Multimedia Interface are trademarks o...

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