So I have a few questions. My whole navigation system went out and I’m pretty sure I would need to replace the board that I see everyone talking about. But when the screen went out my radio still worked. I went to check all the fuses and while doing so when I put one back in I noticed a spark and now the radio won’t work at all. So I replaced all the fuses and still nothing. I don’t want to replace the board so I’m going to get a new unit what I’m wondering is if I maybe blew a fuse in the amp or is there an in line fuse or one in the actual radio I might have blown. I don’t want to replace the top half and the bottom still not work. I backed the whole unit out to check all the wiring but everything looked good.