Vizio P42HDTV sound but no picture just a black...

Question

It was working fine until Feb 9 2009 then all of the sudden the screen went black but the sound remained working. I checked all the connections and they were fine. I turned the TV off for a while then back on. I'm wondering if it could be the master AV card? Or is there a card that controls only the video? I'm pretty good at working on computers so I am just wondering if this is something I could repair myself. I checked the Vizio website and they recommend shiping TVs to some outfit located clear across the country.