The select/start button is not working on my Vita?

Question

as title, anybody face the problems???
actually, my vita (wifi) freezed last week, PS button blue light, cannot shut down.
after hold down power button, enter to Safe Mode, and done everything (restore, restart, rebuild, format m.card).
now, PS button alive, working, but select / start button still not working!!
HELP HELP HELP.......

Answer 1

Here Is the Solution see on pictures This Fault Is Caused With Shorted Right Top Button When This shows conductivity few ohm this interfere with the signal line on the pcb.to test it disconnect this button from the socket by lifting up the small lock on amphenol socket.measure the 2 tracks on the foil if its conductive.in most cases will be leave it disconnected turn on the psp vita with some games and test if the start button respond 99% it will be working ok.if yesthen turn off the unit disconnect the main battery to avoid shortage to the motherboard.peel gently off the top right button and replace with new oneiff you cannot get parts then separate the 2 foil and clean the ferrite pad's.cut a thin foil with 2 hole same size as the button conductive pad's this will create bigger gap between these conductive touch pad's and the foil. Warning !!! This guide is for advanced component level engineers not for beginners require esd protection.