If the Vizio TV in your classroom says it has no network connection and it worked previously, you can unplug the power cable for a few seconds and plug it back in. It should then connect normally when you turn the TV back on.

As an alternative, some TV’s have “Reboot TV” or “Soft Power Cycle” listed in the menus and accomplish the same thing as unplugging. Turning it off and back on with the remote or buttons on the TV don't work.

If these methods don’t work please put in a service ticket with your issue - https://servicetickets.vusd.org/