For past 2 weeks, when set came on, it would be mostly dark with sporatic flicks of light & lines, on lower portion of screen. After 30 minutes of being on, or immediately with a light tap on the left side of rear housing, picture would appear. Seems as though it was a faulty picture tube. Now, at present, TV is dark. probably tube is blown. But, 6 year old set with blown picture tube seems unusual. Any thoughts?
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