I just tried to find "wall mart". Most articles seem to be spoofs of the well known national chain. So I checked the Walmart site, and they don't mention sonyo. They do carry a lot of Sanyo.
Given that you have changed from a "sonyo tv" to a "ViewSonic", and bought one of them (the tv?) from "wall mart", I think it's fair at this point to ask you to double check the part number for us.