I have a VIZIO 50" Plazma HDTV that was a replacement TV to the one that had the "shut off" problem that many others are experiencing. Recently, this tv has started to flicker with black lines in the top one-fourth of the tv. There are times when I can tap or shake the tv to eliminate the lines for a while, but they always return.
Are there any ideas of what could be wrong with the tv and the cost of part to repair>