Lenovo ThinkPad T490 Touchpad Replacement

Loosen the screws from the base plate.

Using a Philips #1 screwdriver fully loosen the six screws on the back cover.

Insert the iFixit opening tool into the space between the base plate and the chassis.

Glide the tool along the perimeter of the case in order to release the clips holding the case and chassis together.

Grab the edge of the cover and lift the cover away from you.

Remove the four 3 mm screws securing the battery with a Phillips #00 screwdriver.

Use tweezers or your fingernails to disconnect the battery from its motherboard socket.

Lift up and remove the battery from the device.

Use a Phillips #00 screwdriver to remove the four screws securing the touchpad.

Use a pair of tweezers to flip up the black locking flap securing the touchpad ribbon cable.

Disconnect the ribbon cable.

Carefully lift the laptop's base from the monitor. The touchpad will be left on the computer's screen.