Based on Vizio's main board reputation and this particular fault, the main is most certainly the problem. You may get by with simply replacing the eeprom on it, but in my experience that's about a 50/50 shot. Shopjimmy and other places offer pre-programmed eeproms if you are comfortable with trying to change it. If you do buy a replacement main be sure to match all of the numbers on it. Most of these Vizio TVs can contain several different board versions.
I am having the same problem with my VA370M. Another thread suggested U409. Since you last posted in August did you get it working or di you buy another TV?
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