I can't find the exact model so this is where I have to check prior discussions.
Pick from https://www.google.com/search?q=Vizio+TV+broadcasting+as+an+unsecured+wifi+hotspot
My Vizio television is broadcasting as an open, unsecured wifi network. I was able to select it with my phone and obtain wifi access without any password.
I canot find any way to either prevent this or to secure it with a password.