Hi thank you so much for your patience.
If we had a way to test the remote but you say your Vizio remote wont work. We cant ;-(
But, with this problem, more than likely the remote has lost its programming.
You can try to reset this if you haven't tried that already. If you have tried this, then you need a new remote.
To be sure the remote that came with the TV isn't failed, make sure the contacts are clean, bright and shiny then insert NEW Duracell only batteries and try the remote. Let me know how that goes as well.
You can also verify if the remote is sending out any signals by aiming at your cell phone camera and pressing any button on the remote, you shoudl see through your phones screen what looks like a bright light emitting from the tip of the remote.
Let me know how it all goes, we will get this problem solved.
If all that checks out you will need to contact Direct TV because I highly doubt the problem is inside your TV ;-)
From everything you have told em I can say that with certainty.
Depending on your remote, they can tell you how re program it so all functions will work.
They don't charge for that.
In any case, I will stick with you until this is complete.
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Thank you and have a great day!