Lenovo Thinkpad T420 Disassembly (Clean Cooling Fan, Remove keyboard)

In this guide, I’ll explain how to disassemble the Lenovo ThinkPad T420 to remove and replace the RAM, keyboard, palm rest, heat sink, and cooling fan.

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Unlock and remove the battery.
Remove one screw securing the ram cover.

Under the RAM cover, you can find two RAM slots.
Remove ten screws from the bottom case.

Flip over your laptop. Lift up the keyboard and disconnect the keyboard cable. You can remove the keyboard.

Remove three screws securing the palm rest.

Pry up and lift the palm rest. Disconnect the touchpad cable from the motherboard.

Remove two screws securing the speaker.

Remove one screw.
Remove the metal plate.

Remove four screws securing the heat sink.
Disconnect the cooling fan cable from the motherboard.

Remove the cooling fan.

Clean the cooling fan with an air-blowing or hairbrush.

Apply for new glues.

For more guides, check out the Lenovo ThinkPad T420 device page.