Due to a vertical line that ran all the way from top to bottom. about 2 inches from the edge of the right side. It was about a 1/4 inch wide and was slightly dimmer then the rest of the picture.
The panel was manufactured in July 2011. And the new one was manufactured in September and looks imo, better. How that can be I don't know, but it really looks crisper, and more detailed.
