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Lenovo ThinkCentre M70a Gen 2 Hardware Maintenance Manual
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Lenovo ThinkCentre M70a Gen 2 Hardware Maintenance Manual

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M70a Gen 2 and M90a Gen 2
Hardware Maintenance Manual

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Summary of Contents for Lenovo ThinkCentre M70a Gen 2

  • Page 1 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 2 First Edition (April 2021) © Copyright Lenovo 2021. 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-...

  • Page 3: Table Of Contents

    ....4 Lenovo diagnostic tools ..Grounding requirements ... . 4 UEFI diagnostic program .
  • Page 4 E-Privacy button board (M90a Gen 2) ..101 Main frame ....113 Card reader ....102 Front decoration cover .

  • Page 5: About This Manual

    Important: This manual is intended only for trained service technicians who are familiar with ThinkCentre computers. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkCentre computer, be sure to read and understand Chapter 1 “Important safety information” on page 1. © Copyright Lenovo 2021...
  • Page 6 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Important Safety Information

    Avoid contact with hot components inside the computer. During operation, some components become hot enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and wait approximately 10 minutes for the components to cool. © Copyright Lenovo 2021...

  • Page 8: Electrical Safety

    Electrical safety CAUTION: Electrical current from power, telephone, and communication cables can be hazardous. To avoid personal injury or equipment damage, disconnect the attached power cords, telecommunication systems, networks, and modems before you open the computer covers, unless instructed otherwise in the installation and configuration procedures.

  • Page 9: Safety Inspection Guide

    • Do not service the following parts with the power on when they are removed from their normal operating places in a machine: – Power supply units – Pumps – Blowers and fans – Motor generators and similar units. (This practice ensures correct grounding of the units.) •...

  • Page 10: Handling Electrostatic Discharge-Sensitive Devices

    8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with. Handling electrostatic discharge-sensitive devices Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge.
  • Page 11 • Italian • Korean • Spanish DANGER Electrical current from power, telephone and communication cables is hazardous. To avoid a shock hazard: • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm. •...
  • Page 12 CAUTION: When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are installed, note the following: • Do not remove the covers. Removing the covers of the laser product could result in exposure to hazardous laser radiation. There are no serviceable parts inside the device. •...
  • Page 13 Chapter 1 Important safety information...
  • Page 14 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 15 PERIGO A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa. Para evitar risco de choque elétrico: • Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste produto durante uma tempestade com raios. •...
  • Page 16 Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de fibra ótica ou transmissores) estiverem instalados, observe o seguinte: • Não remova as tampas. A remoção das tampas de um produto a laser pode resultar em exposição prejudicial à...
  • Page 17 Chapter 1 Important safety information...
  • Page 18 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Important safety information...
  • Page 20 DANGER Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter un danger. Pour éviter tout risque de choc électrique : • Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration de ce produit au cours d'un orage.
  • Page 21 Connexion Déconnexion 1. Mettez les unités HORS TENSION. 1. Mettez les unités HORS TENSION. 2. Commencez par brancher tous les cordons sur les 2. Débranchez les cordons d'alimentation des prises. unités. 3. Débranchez les câbles d'interface des connecteurs. 3. Branchez les câbles d'interface sur des 4.
  • Page 22 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ATTENTION: Soulevez la machine avec précaution. ATTENTION: L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs cordonsd'alimentation.
  • Page 23 • Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind. • Zum Installieren, Transportieren und Öffnen der Abdeckungen des Computers oder der angeschlossenen Einheiten die Kabel gemäß...
  • Page 24 Laserstrahlung bei geöffneter Verkleidung. Nicht in den Strahl blicken. Keine Lupen oder Spiegel verwenden. Strahlungsbereich meiden. ≥18 kg ≥32 kg ≥55 kg ACHTUNG: Arbeitsschutzrichtlinien beim Anheben der Maschine beachten. ACHTUNG: Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen.
  • Page 25 Chapter 1 Important safety information...
  • Page 26 PERICOLO La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere pericolosa. Per evitare il rischio di scosse elettriche: M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 27 • Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la riconfigurazione del prodotto durante un temporale. • Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a terra. • Collegare alle prese elettriche appropriate tutte le apparecchiature che verranno utilizzate per questo prodotto.
  • Page 28 • Non rimuovere gli sportelli. L'apertura di un'unità laser può determinare l'esposizione a radiazioni laser pericolose. All'interno dell'unità non vi sono parti su cui effettuare l'assistenza tecnica. • L'utilizzo di controlli, regolazioni o l'esecuzione di procedure non descritti nel presente manuale possono provocare l'esposizione a radiazioni pericolose.
  • Page 29 Chapter 1 Important safety information...
  • Page 30 PELIGRO La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede ser peligrosa. Para evitar el riesgo de descarga eléctrica: • No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o reconfiguración de este producto durante una tormenta eléctrica. •...
  • Page 31 • No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales. • Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo contrario en los procedimientos de instalación y configuración.
  • Page 32 Algunos productos láser tienen incorporado un diodo láser de clase 3A o clase 3B. Tenga en cuenta lo siguiente: Cuando se abre, queda expuesto a radiación láser. No mire directamente al rayo láser, ni siquiera con instrumentos ópticos, y evite exponerse directamente al rayo láser. ≥18 kg ≥32 kg ≥55 kg...

  • Page 33: Chapter 2. Important Service Information

    • Do not drop a system board or apply any excessive force to it. • Avoid rough handling of any kind. • Avoid bending a system board and hard pushing to prevent cracking at each Ball Grid Array (BGA) chipset. © Copyright Lenovo 2021...

  • Page 34: How To Use Error Codes

    Dynamic Configure To Order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.

  • Page 35: Chapter 3. Product Overview

    Chapter 3. Product overview Front M70a Gen 2 M90a Gen 2 © Copyright Lenovo 2021...
  • Page 36 1. Integrated camera activity indicator* 2. Microphones* 3. Integrated camera or Infrared (IR) camera shield* 4. Integrated camera or Infrared (IR) camera* 6. System status indicator 5. Multi-touch screen* 7. Storage drive activity indicator 8. Microphone mute/unmute indicator* 9. E-Privacy button* 10.

  • Page 37: Rear

    Rear M70a Gen 2 Chapter 3 Product overview...
  • Page 38 M90a Gen 2 1. Security-lock slot 2. Cable cover eject button 4. USB 3.2 connector Gen 1 (with smart power-on 3. Cable clip feature) 5. USB 3.2 connectors Gen 1 6. Ethernet connector ® 8. Power adapter connector 7. Serial connector* / HDMI out connector* ™...

  • Page 39: Chapter 4. Service Checkout And Symptom-To-Fru Index

    • Machine type and model • Processor or hard disk drive upgrades • Failure symptom – Do diagnostics indicate a failure? – What, when, where, single, or multiple systems? – Is the failure repeatable? – Has this configuration ever worked? © Copyright Lenovo 2021...

  • Page 40: Symptom-To-Fru Index

    – If it has been working, what changes were made prior to its failing? – Is this the original reported failure? • Diagnostics version – Type and version level • Hardware configuration – Print (print screen) configuration currently in use –...

  • Page 41: Power Supply Problems

    Error FRU/Action The boot sector on the startup drive is corrupted. The drive must be formatted. Do the following: 1. Attempt to back up the data on the failing hard disk drive. 2. Using the operating system programs, format the hard disk drive.

  • Page 42: Post Error Codes

    POST error codes Each time you turn on the system, it performs a series of tests that check the operation of the system and some options. This series of tests are called the Power-On Self-Test, or POST. POST checks the following operations: •...

  • Page 43: Miscellaneous Error Conditions

    8998 Not enough shadow RAM resources This error message is displayed for OPTION ROM, not all devices when the shadow RAM resources initialized. Suggest to remove some for option ROM are insufficient. add-on cards, or change to UEFI If the legacy option ROM is mode in BIOS setup.
  • Page 44 Message/Symptom FRU/Action Incorrect memory size during POST 1. Run the Memory tests. 2. Memory Module 3. System Board "Insert a Diskette" icon appears with a known-good 1. System Board diagnostics diskette in the first 3.5-inch diskette drive. 2. Diskette Drive Cable 3.

  • Page 45: Undetermined Problems

    Message/Symptom FRU/Action Serial or parallel connector device failure (adapter 1. External Device Self-Test OK? connector) 2. External Device 3. Cable 4. Alternate Adapter 5. System Board Some or all keys on the keyboard do not work 1. Keyboard 2. Keyboard Cable 3.
  • Page 46 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 47: Chapter 5. Troubleshooting, Diagnostics, And Recovery

    4. Run the diagnostic program. See “Diagnostics” on page 50. 5. Recover your operating system. See “Recovery” on page 51. 6. If the problem persists, contact Lenovo. Troubleshooting Use the troubleshooting information to find solutions to problems that have definite symptoms.

  • Page 48: Startup Problems

    Startup problems Problem Solution • Ensure that the power cord is correctly connected to the rear of the computer and to a working electrical outlet. • If the computer has a secondary power switch on the rear of the The computer does not start up when you computer, ensure that it is switched on.

  • Page 49: Screen Problems

    Screen problems Problem Solution • The computer voltage matches the voltage available at the electrical outlet for your country or region. • Press a key to exit the screen saver. • Press the power button to wake the computer from sleep or The screen goes blank while the computer is hibernation mode.

  • Page 50: Audio Problems

    Audio problems Problem Solution • If you are using powered external speakers that have an On/Off control, ensure that: – The On/Off control is set to the On position. – The speaker power cable is connected to a properly grounded, functional ac electrical outlet.
  • Page 51 Problem Solution • Connect the cable from the Ethernet connector to the RJ45 connector of the hub. • Enable the Ethernet LAN feature in UEFI BIOS. • Enable the Ethernet LAN adapter. 1. Go to Control Panel and view by large icons or small icons. 2.
  • Page 52 Problem Solution • Enable the Bluetooth feature in UEFI BIOS. • Enable all Bluetooth devices. 1. Right-click the Start button to open the Start context menu. 2. Click Device Manager. Type the administrator password or provide confirmation if prompted. 3. Expand Bluetooth to display all Bluetooth devices. Right-click each Bluetooth device, and then click Enable device.

  • Page 53: Performance Problems

    Performance problems Problem Solution Note: Depending on the volume of the storage drives and amount of data stored on the storage drives, the disk-defragmentation process might take up to several hours. 1. Close any open programs and windows. 2. Open the Start menu. Excessive fragmented files exist on the 3.

  • Page 54: Storage Drive Problems

    Storage drive problems Problem Solution • Ensure that the signal cables and power cables for all the storage drives are connected correctly. • Ensure that the computer is configured correctly to support the storage drives. Some or all storage drives are missing from –...

  • Page 55: Serial Connector Problems

    Problem Solution • Disable any background programs, such as AntiVirus or Desktop The playback is slow or choppy. Themes. • Ensure that video resolution is less than 1152 x 864 pixels. • Ensure that the disc is in the drive with the shiny side of the disc facing down.

  • Page 56: Software Problems

    Use diagnostic solutions to test hardware components and report operating-system-controlled settings that interfere with the correct operation of your computer. Lenovo 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 computer. It enables you to test memory modules and internal storage devices, view system information, and check and recover bad sectors on internal storage devices.

  • Page 57: Recovery

    Table 1. Options on the main screen of the UEFI diagnostic program DIAGNOSTICS TOOLS • CPU [U] • SYSTEM INFORMATION [F1] • DISPLAY [D] • BAD BLOCK RECOVERY [F3] • MEMORY [E] • SMART INFORMATION [F5] • MOTHERBOARD [H] • PCI EXPRESS [P] •...

  • Page 58: Windows Automatic Recovery

    Windows recovery programs are damaged. If you did not create a recovery USB drive as a precautionary measure, you can contact Lenovo Customer Support Center and purchase one from Lenovo. For a list of the Lenovo Support phone numbers for your country or region, go to: https://pcsupport.lenovo.com/supportphonelist Create a recovery USB drive Attention: The creation process deletes anything stored on the USB drive.
  • Page 59 • 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.
  • Page 60 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 61: Chapter 6. Hardware Removal And Installation

    Common tool Isolated tweezers Common tool Hexagonal socket Common tool Silicone grease Consumable tool Polyamide tape Consumable tool Mylar tape Consumable tool Eraser Consumable tool Electrical tape Consumable tool Double-sided tape Consumable tool Conductive tape Consumable tool © Copyright Lenovo 2021...

  • Page 62: Major Frus And Crus

    Note: The silicone grease can be applied to the surfaces of the microprocessor and heat sink to eliminate air gaps. The hexagonal socket is used to pick up the antenna connectors. Major FRUs and CRUs Your computer contains the following types of CRUs and FRUs: •...
  • Page 63 Number Description Self-service CRU Optional-service CRU UltraFlex IV Stand* UltraFlex IV Stand base* Full-function monitor stand* Full-function monitor base* VESA mount bracket cover VESA mount bracket Cable cover Integrated camera and microphone module* Bump cover Main frame LCD bracket LCD panel Wi-Fi antennas Front decorative cover LCD backlight cable...
  • Page 64 Rear cover Power cord Power adapter Keyboard* Mouse* * for selected models For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go http://www.lenovo.com/serviceparts-lookup M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 65 Major FRUs and CRUs of M90a Gen 2 Number Description Self-service CRU Optional-service CRU UltraFlex IV Stand* UltraFlex IV Stand base* Full-function monitor stand* Full-function monitor base* VESA mount bracket cover VESA mount bracket Cable cover Integrated camera and microphone module* Bump cover Main frame Chapter 6...
  • Page 66 Number Description Self-service CRU Optional-service CRU Side I/O brackets LCD bracket LCD panel Speakers Wi-Fi antennas Front decorative cover LCD backlight cable Touch board cable LCD LVDS cable Hard disk drive* Hard disk drive cable* Hard disk drive bracket E-Privacy button board* Cover presence switch (intrusion switch)* Serial connector module*/HDMI connector module*...
  • Page 67 * for selected models For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go http://www.lenovo.com/serviceparts-lookup Chapter 6 Hardware removal and installation...

  • Page 68: System Board

    System board M70a Gen 2 LCD LVDS connector Integrated camera and microphone module connector Microprocessor socket HDMI connector Serial (COM1) connector Touch board connector Memory slots M.2 solid-state drive slot M.2 Wi-Fi card slot Optical drive connector Clear CMOS (Complementary Metal Oxide ME disable header Semiconductor) / Recovery jumper Internal speaker connector...

  • Page 69: Removing And Installing Hardware

    LCD backlight connector LCD LVDS connector Integrated camera and microphone module connector Microprocessor socket HDMI connector Serial (COM1) connector Memory slots M.2 solid-state drive slot M.2 Wi-Fi card slot Coin-cell battery Touch board connector Optical drive connector Internal speaker connector E-Privacy connector Cover presence switch connector (intrusion switch Card reader connector...

  • Page 70: External Options

    External options You can connect external options to your computer, 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.
  • Page 71 • UltraFlex IV Stand Chapter 6 Hardware removal and installation...
  • Page 72 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 73: Rear Cover

    Rear cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Before you open the rear cover, turn off the computer and wait several minutes until the computer is cool. For access, do the following: 1.

  • Page 74: Optical Drive

    3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the computer cover is facing up. 4. Remove the computer stand, if any. See “Computer stand” on page 64. Replacement procedure Note: If a locking device is available, use it to lock the computer after installing the computer cover.
  • Page 75 Removal steps M70a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 76: Optical Drive Holder

    M90a Gen 2 Optical drive holder Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...

  • Page 77: System Board Shield

    Removal steps M70a Gen 2 M90a Gen 2 System board shield Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. •...
  • Page 78 Replacement procedure M70a Gen 2 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 79: Vesa Mount Bracket Cover

    M90a Gen 2 VESA mount bracket cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. CAUTION: Before you open the VESA mount bracket cover, turn off the computer and wait several minutes until the computer is cool.
  • Page 80 Replacement procedure M70a Gen 2 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 81 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 82: Vesa Mount Bracket

    VESA mount bracket Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...

  • Page 83: Hard Disk Drive And Bracket

    Hard disk drive and bracket Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the internal storage drive, observe the following guidelines: •...
  • Page 84 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 85 M90a Gen 2 Chapter 6 Hardware removal and installation...
  • Page 86 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 87: M.2 Solid-State Drive

    M.2 solid-state drive Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the internal storage drive, observe the following guidelines: •...
  • Page 88 • For M.2 solid-state drive (2242) models M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...
  • Page 89 M90a Gen 2 • For M.2 solid-state drive (2280) models Chapter 6 Hardware removal and installation...
  • Page 90 • For M.2 solid-state drive (2242) models M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 91: Memory Module

    Memory module Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Ensure that you follow the installation order for memory modules shown in the following illustration. Chapter 6 Hardware removal and installation...
  • Page 92 For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. • “Optical drive holder” on page 70. • “System board shield” on page 71. •...
  • Page 93 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 94: System Fan

    System fan Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...

  • Page 95: Heat Sink

    M90a Gen 2 Heat sink Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool.
  • Page 96 • “System board shield” on page 71. • “VESA mount bracket cover” on page 73. • “VESA mount bracket” on page 76. Replacement procedure Notes: • Carefully remove the screws from the system board to avoid any possible damage to the system board. The screws cannot be removed from the heat sink.
  • Page 97 Chapter 6 Hardware removal and installation...

  • Page 98: Bump Cover

    Bump cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. •...
  • Page 99 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 100: Microprocessor

    Microprocessor Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. CAUTION: The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. For access, remove the following parts in order, if any: •...
  • Page 101 Note: Depending on the computer model, an HDMI connector module might be installed in your computer instead of a serial connector module. The replacement procedures for them are similar. For access, do the following: 1. Remove the following parts in order, if any: •...

  • Page 102: Cable Cover

    Cable cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Before you open the cable cover door, turn off the computer and wait several minutes until the computer is cool. For access, remove the following parts in order, if any: •...
  • Page 103 Replacement procedure M70a Gen 2 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 104: Wi-Fi Card

    Wi-Fi card Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. •...

  • Page 105: Cover Presence Switch (Intrusion Switch)

    Your computer has a special type of memory that maintains the date, time, and settings for built-in features, such as parallel connector assignments (configurations). A coin-cell battery keeps this information active when you turn off the computer. The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell battery lasts forever.
  • Page 106 • “Rear cover” on page 67. • “Optical drive” on page 68. • “Optical drive holder” on page 70. • “System board shield” on page 71. • “Hard disk drive and bracket” on page 77. 2. Disconnect the cover presence switch cable (intrusion switch cable) from the system board. Replacement procedure M70a Gen 2 M90a Gen 2...

  • Page 107: E-Privacy Button Board (M90A Gen 2)

    E-Privacy button board (M90a Gen 2) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. •...

  • Page 108: Card Reader

    Removal steps Card reader Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...

  • Page 109: System Board

    M90a Gen 2 System board Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. •...
  • Page 110 • “Hard disk drive and bracket” on page 77. • “M.2 solid-state drive” on page 81. • “Memory module” on page 85. • “System fan” on page 88. • “Heat sink” on page 89. • “Microprocessor” on page 94. • “Serial connector module” on page 94. •...
  • Page 111 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 112: Internal Speakers

    Internal speakers Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...
  • Page 113 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 114: I/O Brackets (M90A Gen 2)

    I/O brackets (M90a Gen 2) Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Replacement procedure of the left I/O bracket For access, remove the following parts in order, if any: • “Computer stand” on page 64. •...
  • Page 115 Replacement procedure of the right I/O bracket For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. • “Optical drive holder” on page 70 •...
  • Page 116 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 117: Integrated Camera And Microphone Module

    Integrated camera and microphone module Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. •...
  • Page 118 M90a Gen 2 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 119: Main Frame

    Main frame Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. Chapter 6 Hardware removal and installation...
  • Page 120 • “Optical drive holder” on page 70 • “System board shield” on page 71. • “VESA mount bracket cover” on page 73. • “VESA mount bracket” on page 76. • “Hard disk drive and bracket” on page 77. • “M.2 solid-state drive” on page 81. •...
  • Page 121 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 122: Front Decoration Cover

    Front decoration cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. •...
  • Page 123 M90a Gen 2 Chapter 6 Hardware removal and installation...

  • Page 124: Wi-Fi Antennas

    Wi-Fi antennas Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: • “Computer stand” on page 64. • “Rear cover” on page 67. • “Optical drive” on page 68. •...
  • Page 125 • “Integrated camera and microphone module” on page 111. • “Main frame” on page 113. Replacement procedure M70a Gen 2 Chapter 6 Hardware removal and installation...
  • Page 126 M90a Gen 2 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 127: Lcd Bracket And Lcd Panel

    LCD bracket and LCD panel Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: • “Computer stand” on page 64. •...
  • Page 128 • “Heat sink” on page 89. • “Bump cover” on page 92. • “Microprocessor” on page 94. • “Serial connector module” on page 94. • “Cable cover” on page 96. • “Wi-Fi card” on page 98. • “Cover presence switch (intrusion switch)” on page 99. •...
  • Page 129 M90a Gen 2 Chapter 6 Hardware removal and installation...
  • Page 130 M70a Gen 2 and M90a Gen 2 Hardware Maintenance Manual...

  • Page 131: Chapter 7. Notices And Trademarks

    Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.
  • Page 132 Actual results may vary. Users of this document should verify the applicable data for their specific environment. This document is copyrighted by Lenovo and is not covered by any open source license, including any Linux agreement(s) which may accompany software included with this product. Lenovo may update this document at any time without notice.

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