Sony LCD - Sound but no display

I purchased sony lcd 32" ex400 around 3 years ago for my room and rarely used it (because of my frequent outstation visits) If I'm not wrong in three years the total runtime would not be more than 10 hours combined

Just yesterday after a long time I turned it on but neither startup logo nor any sort of picture cameup HOwver I could see some back light and if I change channel I can hear the channel sounds

So I wanna know If anyone else had this issue how much he had to pay to get it fixed from sony service center???