Television and Home Theater

I have a 50" phillips big screen,it turns itself of ,will come back on sometimes for about 1 hour then off again,has gotten worse won't even turn on sometimes now/anyone know and where I might could order part.
Model #50P8341

I have a 50" phillips big screen,it turns itself of ,will come back on sometimes for about 1 hour then off again,has gotten worse won't even turn on sometimes.anyone know and where I might could order part.
model #50P8341

Hi, I'm wondering if this is a repair or replace. My TV (Sanyo) flatscreen, just over a year old has a buzz which is louder when the tv is first turns on and fades once it "warms up". It's not coming through the speakers as volume and mute do not change it. I appreciate any help you can offer.
Thanks,
Deb