Hi, What game system are you trying to hook up and what's the model number off of the back of your Vizio TV please?
Is it the original WII using the red, white and yellow cables please?
Okay please give me 5 minutes to pull up this info for you.
Okay, on the back of the TV, you plug the YELLOW WII cable into the "Green" jack labeled "Y/Video" and then the RED AND WHITE plug into the red and white jacks.
Use the Vizio remote and find the INPUT button.
Press it until you have "AV" or "Video" on the screen.
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Are you still having problems connecting these?
Okay then you need to purchase a new set of RWY RCA cables, and then connect the Yellow to the Green "Y/Video" on the TV and then the red and white to those colored jacks, select AV/Video and you'll be all set.
Well what cords do you have?