My son recently bought a Philips lcd tv model 32pfl7403d

the problem he found was when the volume is set down low he can here an annoying humming noise. I got him to disconnect everything and just have the power lead connected and the noise is still there. Normally it wouldn't be a problem because usually the volume is up loud. But at night time when laying in bed he puts the volume down lower as not to wake other members of the household up. This is when it becomes a problem as the hum is heard over the volume of the show he may be watching. The hum itself comes from inside the tv and not the speakers. Has anyone else experienced this problem and is it fixable?