Frst of all, welcome to TSF. We're glad you found us.
From the Visio owner's manual:
Caution: Do not apply pressure or throw objects at your HDTV. This may compromise the integrity of
the display. The manufacturer’s warranty does not cover user abuse or improper installations.
Don't know why but I find this funny. Hopefully you're not to this stage yet.
My guess is the problem is in the provider signal not the TV. Just because it says its an HD channel doesn't mean they are sending a HD signal. Try turning the ADB off, unplugging it for 30 minutes, then turn it and the TV back on. Then go to a known HD channel when they should be sending a HD signal - NFL game, prime time network show, etc. (The service suppliers web site will list which channels are HD and which are not.) The Visio should see it. If not, call the IPTV provider - as difficult as that will be - and insist they address your issue. Another way is to call the IPTV sales office - they always answer the calls - and say you want to upgrade to their full HD package but need to get it to work first , and can they help.
Sorry I can't be more specific. I don't know the systems up there in Wisconsin.