I have had my 50’ plasma TV for roughly 2 years now. I am noticing that there is a very faint white vertical line that moves across the screen moving left to right. Once it is off the screen another one appears and the process repeats. However, when I have my Xbox 360 running I do not notice the lines? Any idea what it could be?
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If it doesn't happen with the 360, it most likely isn't the TV. Check the connections for everything else, and if possible try another cable/Directv box from another TV in the house.