Had my 50" Vizio, "die" last year, called Vizio, and if the symptoms are similar, they ARE repairable.
Mine was fine up until I heard a "Pop" like a light bulb from the lower left corner (as your looking at the screen), and it turned out to be a small processing board Vizio makes replacement boards for.
Check with TV repairmen around your town, don't give up hope yet.
Mine is an old Russian guy, I swear, probably wired ICBM's during the Cold War, he said it was not anything major, and charged me $265.00