Like others have said, it sounds like your tuner has gone out. We have several DVD records with tuners. They are harder to find with tuners today, but you might try a thrift store for one. Or even an old VCR would do. All you would be using it for is the tuner. If you find one, use the RCA jacks to connect it to your TV. I think that would get you going.
Larro
We have digital cable service. There seems to be some dvd recorders with tuners but I need to check those out in more detail. Some require a card that is provided by the cable company, or permission from the cable company by the sounds of it.