My TV channels were working until last week. Now all of a sudden they've stopped.?

Hard to answer with so little information. What was your TV's antenna jack connected to? An antenna? A wall outlet for cable TV service?

Here's one possibility, and only one without more info. If you're connected to a wall outlet, the former occupant of your residence had cable service. When he canceled his account, no physical work was quickly done to remove the channels from your cable. That was finally done last week.

If that doesn't explain it for you, edit your question with the missing details for a better answer.

In any case, you are not stealing cable. As long as you haven't physically connected to a cable source off your property, it's legal.

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Edit: Again, you cannot be liable for stealing cable if you have done nothing on the line side of the cable service interface panel at your residence. (Even that would be arguable in some jurisdictions.)

It is the cable company's responsibility to block service to your residence if you are not a customer. It is not your responsibility to simply avoid connecting a TV to a cable jack on your wall, with whatever result that brings.

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Followup per your Addtional Details: in that case, my suggested possibility above is correct. And the one year doesn't suprise me at all. The necessary physical work to block basic channels from a residence requires an on-site visit to a pole or vault near your property, and the cable companies typically don't get around to that for weeks or months.

You don't need a converter for an antenna if you bought your TV new in the U.S. any time after March 2007. It will have the necessary digital tuner. An older set *may* have it, but you'd need to check its specs for an ATSC tuner. As for an antenna, you need the very best one you can arrange, and that's another long story. You might post a separate question on that, and if you do, include your Zip code (if you're in the U.S.) for a good answer.

Try doing one more Channel scan (cable or Antenna) and the channels may show up.

If not, either your TV is busted or someone cut your (illegal) cable.