Don't know your particular problem as I haven't had any issues (knock on wood), but I have had several questions and called VIZIO. I have been pleasantly surprised with how responsive and helpful their service department has been. Give it a try: http://www.vizio.com/support.aspx.
If there is defect they have great product guarantees too, so you should be fine.
I got a Vizio VX20L LCD TV and it was working fine until now. For some reason, I can't change the channels through my remote or by pressing the buttons on the TV (the + and -). However, all other functions work such as changing volume or changing channels by inputting the numbers themselves.
Can anyone with a Vizio shed some light on this? Thanks in advance.