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Hello, First- sorry you're having problems.
Secondly, Vizio states the only two functions that button can control are TV power on/off, and also Input switching. There is no way to access channel changing or volume using that button, and the original remote control will be needed. I'm sorry and realize that s not the answer you'd hoped for, but that is the only way you will be able to change volume and channels.
The OEM (original equipment) remote for your set can be purchased at the link below if you'd like:
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Hello, I was just following up to see if you needed further help. The site shows that since the question is open that you are still looking for help. Or, if you received the information you were looking for- please kindly RATE my service POSITIVELY to reflect that. Thank you.