I recently picked up a Sangean HDT-1 from a garage sale for cheap. It worked fine at first, but then started developing problems. It would stop being able to find HD stations and would scan at an incredibly slow rate. It would also get to a point where it the signal strength would stay on the max, but with no sound at all, not even static. I did notice a part of it getting hot, but that could have been from sitting on the receiver.
I'm hoping you guys might have some ideas. I'm not likely to find another tuner like this for cheap. I did find the service manual, so my dad might be able to take a look at it.