Xperia:Disassembly Guide

Taking this phone apart is generally very easy. There are only a few screws between you and the mainboard. These are:

• Six (6) silver T5 torx screws
• Seven (7) black T5 torx screws
• Two (2) black #0 Phillips screws (under the battery)

Note that one of the Phillips screws can't be accessed until the other screws and the back plate are removed. The mainboard isn't really held down by anything else, but beware the two ribbon cables connecting it to the display. The larger one is held in place by a mere hint of friction, and getting it back in place while reassembling the phone is a real pain in the ass.

If you're having issues with the phone that seem to be hardware related, check around the mainboard and the shell for little square stickers. They should all be white; if any are red, that's an indication that moisture got inside the phone. If you need to do any more complicated repairs, there are several guides available around the internet, such as these from iFixIt.