i have a philips 50PF9431D/37 plasma. i use a home theatre system, so i do not use the speakers on the tv itself. however, even at zero volume on the tv there is a still a static noise that comes out of the speakers. i called phillips and they told me to upgrade the software(which i had already done). they then told me they had no idea what was wrong and to get it serviced. anyone else have this problem? i am tempted to return this tv and get the panasonic th50px6ou. any thoughts? thx!