I recently purchased a philips 42 plasma but after a month I have noticed a high frequency sound coming from the rear of the unit but only when there is a picture on the screen, it is present even when the volume is off and doesnt start unless the tv has been on for an hour our so, Had the tech come an he said it is a reverberation boucing off the wall and to move it away from the wall a bit more. Cant fiqure that as they are supposed to wall hang. Anyway still not happy and tech says manufacturer will have to have a look. Anyone had similar fault with plasma's
mine only happens when i am playing from my dvd player. i thought it was the spinning of the dvd amplified throught the connections. but then sometimes it happens without any dvds! but certainly never happens when i'm not watching off the dvd player. is yours the same problem or no dvd player involved? sometimes some amplifiers (in this case your plasma tv one) can "pick up" "frequencies" - things like other electrical devices, etc
Involuntary autocorrect in operation on mobile device. Apologies in advance.