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

In this guide, I’ll explain how to Lenovo ThinkPad T420 to remove and replace the RAM, keyboard, palm rest, heat sink and cooling fan. Refer to this guide, you can repair, upgrade and clean your ThinkPad T420.

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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 cooling fan cable from the motherboard.

Remove the Thinkpad T420 cooling fan.

Clean cooling fan with a air-blowing or hairbrush.

Apply for new glues.

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

Link Ref : https://www.myfixguide.com/manual/lenovo-thinkpad-t420-disassembly-clean-cooling-fan/