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Hello, What you ended up doing by accident was changing the Input the TV was set to. This is the only thing that causes it to work one minute, then say No Signal the next minute. Please find the ORIGINAL Vizio remote, OR the button on the TV itself labeled "Input" and change it back to the one you usually watch DISH from. This could be "Component, HDMI 1, HDMI 2, etc.".
Let me know once you're able to see my reply please.