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Hi , I`m Jack and I will be helping you today
Please send me a reply when you see this
You can buy a new remote for $23.95 at this link ; http://remotebarn.us/catalogsearch/result/?q=M3D420SR
One thing though before getting a new remote it may be a good idea to test the one you have now .
Those Vizio are known for remote sensor problem.
Do you happen to have a cell phone camera , a tablet a digital camera etc. , any camera that has a display or screen to test the remote ?
If it turns out the remote itself is defective then use that link , otherwise I will show you where you can get a sensor
Still with me ?
Never mind the sensor ,as it turns out this model doesn`t seem to have that problem
Just get your new remote and you should be fine
Let me know if you have other questions and if not for now then please do take the time to rate by clicking on the star icons at the top of your page, then click on Submit so i get paid for my time helping you .