Press the power button on the TV itself
Check the bottom edge, back panel, or side of the TV for the physical power button
Use the Vizio SmartCast app if the TV is connected to Wi-Fi
Use a universal remote programmed for Vizio TVs
Use a streaming device remote if it has TV power control
Plug the TV into a smart plug and turn the plug off and on
Unplug the TV from power, wait a few seconds, then plug it back in
Use HDMI-CEC from a connected device remote if enabled