If you've fiddled with your Vizio TV's factory settings to the point where the TV is in worse shape than before you started, reset the TV to its factory settings to start from square one -- even if you don't have a remote. Resetting the TV to its factory settings lets you build on what you learned, changing the settings you know you like and revising how you tweak with any settings you messed up. Even if the TV winds up in bad shape again, it only takes a few minutes to reset its factory settings manually.
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Press the "Menu" button along the left side of the Vizio TV.
Press the "VOL-" button along the left side of the Vizio TV until the Settings icon in the shape of a wrench is selected, then press "CH-" until "Reset All Setting" is highlighted.
Press "VOL+." The Vizio TV will restart with the factory settings.