you don't need to take it apart fully
step 1) where it says "cybershot" undeneath the digits
insert small blade, the cybershot panel will come away.
step 2) carefully lift off the clear rubber slip that is poking out from under the keys ..the keys will then lift off too.
depending on the problem, you can then gently lift off the white backing to reveal the contacts underneath,
final step: clean or replace ....job done
www.mobilephone-repairs.com
February 2009