You can figure out the approximate frequency by thinking like this: There are 525 lines drawn on a television and the display refreshes at a frequency of (roughly) 60Hz (it's actually a very strange 59.94Hz) BUT REMEMBER THAT IT'S INTERLACED. It's the vibrations of the flyback transformer that is responsible for the horizontal deflection of the electron beam that creates the picture. I randomly came across this post on Google and figured I'd answer. when the tv is not on, I hear a wave of the same pitch coming from the tv, and it only stops when I un-plug the tv. i've become so familiar with the sound, I can tell when our neighbor turns his tv on, too. I can even hear it when i'm in another room. I hear this constant high pitched noise, almost like ringing, but even higher, from the tv.
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