The exact same thing happened to me last night on the same model tv, which we've only had since 1/29/12. I first noticed it when I went to turn the tv off for the night with the DISH remote and it wouldn't respond. I kept trying, then tried with our Bose sound bar remote (which is also programmed to control it) as well as the actual Vizio tv remote. None of which would work, not only to turn off the tv, but to control any other tv specific functions. I finally had to turn it off manually.
This morning I did some trouble shooting, to no avail (i.e., hard reset of the tv and the Vizio remote and I also did the infrared check on the remote where you aim it at the cell phone camera lens and press the power button in order to see if light shows up-if it does, then you know it's not the infrared in the remote itself that's the problem). Since the manual control works and none of the remotes will get a response, it is most likely the IR receiver sensor in the tv itself. I called Vizio, even though the tv is out of warranty, and they came to the same conclusion. I was given a phone number of a company in my area to contact about fixing it. They won't be in until tomorrow, so I'll be calling then to find out how much it's going to cost. I can't believe that a tv that's barely 2 yrs old would have such a problem! We've also been getting red vertical lines on the screen when we first turn it on, which eventually go away after the tv warms up. The problem is that the lines are starting to multiply and the time it takes for them to dissipate is taking longer. I doubt we will ever buy another Vizio after experiencing these issues. We already had to have an HDMI port replaced, thankfully within the warranty period. If you are able to find any helpful information on this matter we're experiencing, please share.
My IR sensor finally died also.
I guess I'm lucky compared to the rest.
Maybe they don't even have this TV anymore lol.
Ordered the replacement part and saw the youtubes so will be fixing it when it comes in.
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