I have 5 amps that I dont know whats wrong with them. I got them in a trade thinking about getting into fixing amps but I just dont have the time. None of the boards have anything noticable that would be the problem. They are Pioneer GMX334, Autotec ss 400.2, Thump TA100.1, Crunch P4125, and an american pro vs-8855. You can have them all for 75 shipped. I might also have an SSL 4F400 but I am in the process of figuring out the warranty on that one because I bought that for my car but then it blew a few weeks ago. If your interested in some broken head units I have 2 that were both temp in my car but they went crap on me.