sony bravia kdl-40xbr2 problem

[kgavionics]

Hi guys
i have a sony bravia kdl-40xbr2 problem and i have a pretty weird problem that i'm trying to fix.TV doesn't turn on.when i plug it to the power the green led on the button turns on and i see nothing on screen, but if i unplug the tv for a long time like a few hours and plug it back in the tv turns on directly and i can see  the menu.if i turn the tv off from the remote then i loose the picture.I  tore the tv apart  and checked all the power supply voltage , they seems good no problem or what so ever.
i don't have any idea what could be the problem.can someone give me a little guidance how to fix this tv?
Regards
kais