Is it like a buzzing sound? is so then it would be coming from your speakers. and would possibly mean a new sound board is in order. another possibility is that their is a hum from the power supply unit. but that's the power control board on the tv. this can also cause audible humming. if it sounds like a high voltage hum from a 60 hertz cycle then it is the power modal on the board failing more then likely.
good luck with it. and get a second opinion as i can easily be wrong. thanks for using fixya
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