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I've seen a few bad remote sensors. Check to be sure you're getting B+ (usually 5 volts) to the remote receiver and make sure the ground lead is making contact with ground. If that's OK, program the remote with a Zenith TV code and use an o'scope to check the data line at the remote receiver. If you have activity when you press a button on the remote, the problem is elsewhere in the set. No activity likely indicates a bad remote sensor.
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