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Why would my HDTV be popping and crackling in the back?

My 49 in Zenith HDTV is making a popping and crackling noise in the back everytime I turn it on and stops when I turn it off. What could it be and is it dangerous?
Gary Chesney, May 2011
link Click here to see other fixes for Zenith 49 in Zenith HDTV.