Ah, but do the other buttons on the remote still do things like change the channel.
First, cover the basics. That includes making sure no physical object is blocking the path between the remote and the TV. Anything sitting in front of a sensor?
Next, has anyone pressed a device button on the remote where signals are being diverted to a DVD or other device rather than to the TV or cable box?
Next, is the battery in the remote dead? Has it been jarred out of its housing so that it is no longer powering the remote?
Next, has anyone been trying to program the remote for any other TV system? Codes change across brands.
If you have a bad remote, a replacement universal remote may be useful. Can the remote turn the cable box on and off, independent of the TV?
The above are things to check and eliminate. The manufacturer itself may sell a replacement remote if all else fails.
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