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Introdução

If your Lenovo T420 has key or thermal issues, this guide will show you how to remove the keyboard to gain partial fan access or to replace a faulty keyboard.

Guide notes

  • If you are removing the keyboard for fan access, blowing too much air into the heatsink in one shot (or being too close) can damage the fan. If the damage is particularly severe the system will give you a fan error and shut off to protect the processor (and dGPU, if equipped). If the system says Fan error when it is rebooted, the fan is damaged and will need to be replaced and the system will refuse to boot past this error. Use extra caution if you suspect the fan is failing prior to cleaning the heatsink. The fan in the author's system was rattling before I cleaned it and the issue has not come back since. If the fan ends up getting damaged, this is NOT your fault; all you did was reveal the system needs a new fan.
  • If you are replacing the keyboard, check the Lenovo HMM to determine what keyboard you need. This can also be found on the back of your old keyboard as well.
  • While this is not a hard repair, you may wish to sort your screws. Losing the silver screw under the RAM door can be a fatal mistake.
  • Watch the ground on the chassis by the RAM door. This can get in the way or come loose from the chassis. If this happens push it back into place and it'll be almost as good as new.

Peças

  1. Due to keyboard FRUs being country specific, refer to the following photos or the Lenovo HMM to find the part you need. Due to keyboard FRUs being country specific, refer to the following photos or the Lenovo HMM to find the part you need. Due to keyboard FRUs being country specific, refer to the following photos or the Lenovo HMM to find the part you need.
    • Due to keyboard FRUs being country specific, refer to the following photos or the Lenovo HMM to find the part you need.

  2. Remove the battery. To do this, push the locking tab to the unlocked position. Once the battery is unlocked, hold the battery release tab in and pull the battery out. Once the battery is unlocked, hold the battery release tab in and pull the battery out.
    • Remove the battery. To do this, push the locking tab to the unlocked position.

    • Once the battery is unlocked, hold the battery release tab in and pull the battery out.

  3. WWAN ready systems ship with antenna covers over these cables. Someone installed a WLAN card on my example here, which had to be removed. To remove the RAM door, use a Phillips #0 bit. Unscrew the RAM door and set the screw aside in a safe location. To remove the RAM door, pull it off from the side. This can be done with a plastic pry tool or your fingernail.
    • WWAN ready systems ship with antenna covers over these cables. Someone installed a WLAN card on my example here, which had to be removed.

    • To remove the RAM door, use a Phillips #0 bit. Unscrew the RAM door and set the screw aside in a safe location.

    • To remove the RAM door, pull it off from the side. This can be done with a plastic pry tool or your fingernail.

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  5. A magnetic screwdriver is highly recommended for this screw. It has a tendency to not come out unless a magnet is used. To remove the keyboard, remove the final screw. This will be located under the RAM door.
    • A magnetic screwdriver is highly recommended for this screw. It has a tendency to not come out unless a magnet is used.

    • To remove the keyboard, remove the final screw. This will be located under the RAM door.

  6. Open the laptop. To remove the keyboard, release the keyboard hooks using a plastic pry tool. Once the keyboard is loose, remove it from the chassis.
    • Open the laptop.

    • To remove the keyboard, release the keyboard hooks using a plastic pry tool.

    • Once the keyboard is loose, remove it from the chassis.

  7. If you have a can of compressed air available, use this opportunity to remove some of the dust in the heatsink. Further disassembly will be needed to do a full cleaning, but this will knock out most dust. Disconnect the keyboard from the motherboard. Use a plastic pry tool for this step. Disconnect the keyboard from the motherboard. Use a plastic pry tool for this step.
    • If you have a can of compressed air available, use this opportunity to remove some of the dust in the heatsink. Further disassembly will be needed to do a full cleaning, but this will knock out most dust.

    • Disconnect the keyboard from the motherboard. Use a plastic pry tool for this step.

  8. Reconnect the keyboard to the motherboard. Once connected, slide the top (volume controls) in first. Once the top of the keyboard is pushed in, slide the keyboard down to re-engage the lower clips until they are not visible. Replace the silver screw and RAM door.
    • Reconnect the keyboard to the motherboard. Once connected, slide the top (volume controls) in first.

    • Once the top of the keyboard is pushed in, slide the keyboard down to re-engage the lower clips until they are not visible.

    • Replace the silver screw and RAM door.

Linha de Chegada

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Nick

Membro desde: 10-11-2009

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Master Techs Membro de Master Techs

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Excellent guide, I like the detail specifying screw bits

Jakezxz1 - Responder

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