this is a issue in the tv. are you still under warranty?
does the screen light at all?
is the power light green or red?
have you tried to unplug it and wait a min then plug it back in?
i am sorry but you have a problem inside the tv, but sony should come to you to fix this issue. here is there contact info.
Priority Service:(NNN) NNN-NNNN Mon-Fri 8:00am-12:00am (Midnight) ET