SOURCE: channel up/down button on remote for 37" vizio tv
It is possible that the pads are worn out or there is damage on the main board, possible carbon track failure . you might need to reform the tracks or use a remote control repair kit to retrack. Also in some cases the controller IC can be defective as it fails to detect the selected port. http://www.fixya.com/support/r6178946-tips_repair_remote_controller
Please try this link for some tips:
SOURCE: Vizio VW32L HDTV10A stopped responding with Vizio
Change the batteries in your remote. If your cat was laying on a button it could have drained them.
Here's tip - you can use your camera on your cell phone to see the IR signal coming out of your remote. Point the remote at your cam and press "On" or any button. You should see a bright flash with every key stroke.
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