Unknown hissing noise coming from TV when it is on.

Unknown hissing noise coming from TV when it is on.

I have a Vizio VW47L FHDTV10A. There is unknown hissing noise emanating from the back of the TV. It is not related to the speakers, as it occurs when the TV is muted as well. Is it possible that a controller board or mother board has a burnt out transformer. Is there a way to diagnostically find the problem so that I can proceed to repairing/replacing the parts. Thanks.

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