Facing TV Problems? Ask a TV Technician.
Hello, Sorry you're having problems. Vizio does not support Sling and there is also not a way to add the Sing app to the TV. Below are the supported devices that wok with the Sling app:
That said you would either need an Apple TV box, Roku box, Amazon Firestick, Chromeecast, or one of the other devices shown to connect to the Vizio's HDMI port to then display the content on the Vizio.
Other than that, I'm sorry for the bad news and wish there were a quick fix.
If you need further assistance let me know. Before you go, PLEASE DO click at least a 3 STAR RATING, at the top of your screen. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.