Did you buy the TV from a local store or online? If online, that's why I personally hate buying electronics online just because I may have to ship it back. Not worth the $150 I might save. Anyways, if you bought it from a local store, do they have one on display and running? If so, go back and see if that set makes noise. I'd get a replacement or exchange it for something else. I couldn't find too many reviews, but read the two here: http://www.hdtvsolutions.com/Philips-42PF5321D-37-reviews.htm. Both state that picture quality is great, but both people have had problems and state that Philips' customer service is bad. Hmmmm....not a good sign. If my brand new TV made noise, I'd return it. Noise is not acceptable.
I just got it out of the box, put it at its place, turned it on and there's this soft annoying sound that, apparently comes out of the screen (not the speakers). Is it normal? or should I ask for a refund?