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Come to think of it, it was more than 20 years ago I read a Consumer Reports article where they found something like this, yes, in a TV set, a lug connected to one of the power leads inadvertently touched a lug connected to one of the antenna leads. This was in the days before printed...

You could try this: Disconnect all audio and video cables including HDMI. Plug in all the equipment to wall outlets. Turn on each piece of equipment. Measure voltage from the shells and also the center pin connections of RCA and coax and BNC jacks to the power outlet ground...