phillips 37pfl5522d help

[ajjch]

Hi all
I have a phillips 37" model no 37pfl5522d everything seems ok on it but when i switch it on it last for about 30 minutes the the picture goes off but still have sound, I have read up on some other forums that say its could be the inverters but i dont want to fo out and buy them if its not
Please could someone give me some advice
thanks in advance
ajjch