You could try performing a hard reset. Different models have different reset methods.. I found two methods here for Vizio TV's:
Method 1
Turn The TV off.
Press and hold the {CH +} & {CH -} buttons on the TV.
Then press and release the {POWER} button on the TV.
Release the {CH +} & {CH -} buttons.
Now press the {MENU} button on the remote.
You should get your regular menu up, but with a "F" in the bottom right corner of the menu (This if for factory).
Press and hold the {MENU} button for few seconds.
The Service Menu will be displayed.
Method 2
Turn The TV off.
Press and hold the {CH +} & {CH -} buttons on the TV.
Then press and hold the {POWER} button on the TV.
Keep all three buttons pressed for few seconds.
Now press the {MENU} button on the remote.
You should get your regular menu up, but with a "F" in the bottom right corner of the menu (This if for factory).
Press and hold the {MENU} button for few seconds.
The Service Menu will be displayed.
This same hard reset can be accomplished by unplugging the set for 2 hours - and during the unplug period - hold down the POWER button for 1 minute. While re-plugging to wall - also hold the power button.
Source: http
/www.justanswer.com/tv-repair/5bla2-need-know-factory-reset-vizio-e370vl.html#