You disclosed that the TV needed repairs, and more than once you offered him a refund. He knew what he was buying, and he had fair opportunity to get his money back. He could take you to court if he really wanted to, you can technically sue over anything, but nobody is going to put that kind of time and money in to recovering $60. I think he is bluffing, or trying to scam you. At this point I would just cut ties and ignore him. Save all your communication with him and the ad you put on letgo. If you get a summons, answer it. But I really doubt it's going to come to that.