Why is my laptop device typing random letters when I push the spacebar?

You can replace the keyboard near a new one, only quite often "Reseating" a keyboard can fix the problem.

Reseating means to disconnect and reconnect.

To make therefore, Unscrew the screws with a "Keyboard" icon near them. You keyboard should then slink off and be attached by a thin cable. Lifting up on the sides of the cable's handleshould allow the cable to slide off. CARRY OUT NOT FORCE ANYTHING! Whether it is hard to move, you probably are doing it wrong.

To reseat simply reconnect the cable.

WARNING: If you aren't handy, you may want to ask somebody who is to do this all for you.