Lenovo ThinkPad T420si User Manual page 120

7. Push hard in the direction shown by the arrows (1) in the drawing to unlatch the front side of the
keyboard. The keyboard will open up slightly (2).
8. Carefully lift the keyboard until you can see how it's connected. Hold the keyboard above the computer,
and then detach the connector (1). Now the keyboard has been removed (2).
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User Guide