Ihave vizio 50 inch model p50hdm.when i turn it on the screen sometimes looks freat and sometimes (more than not)is looks like crap the screen has blurry and colors look like they run together and they look all dull and stuff ,dont know how else to explain it ,i was told it was the main board that the cables plug in to like the hdmi and rca cables etc.. Do you have any ideas if this is true or not please respond