Purchased Vizio VT420M on Jan 22 2010 from Walmart. TV was DOA out of the box (sound but no picture). Returned TV to Walmart and received another one. July 2010 TV started experiencing same problem as first one intermittent sound but no picture. Call Vizio, they said to do a reset (unplug TV, hold in the on/off button for 60 seconds, plug TV back in), this did not solve the problem. September 2010, have nothing but sound, no picture at all. Call Vizio for warranty service, they had me troubleshoot a few things and then confirmed that TV needed... read full review »