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Does the TV have speakers? Most do. You can get audible frequencies leaking onto the audio line and emitting noise. My LCD monitor has built in speakers that I

Does the TV have speakers? Most do. You can get audible frequencies leaking onto the audio line and emitting noise. My LCD monitor has built in speakers that I never use and have turned "off", but every once in a while I hear a hiss from them.

kw71 11y ago
That is noise inherent in the (low quality) audio amplifier.
LnxPrgr3 11y ago
I doubt it's what's going on with most TVs (especially since LCD TVs don't seem to have this problem), but my old, cheap TV tuner card emits a 15.9kHz squeal on its line out, so it's not impossible.