Does anybody know anything about radios!? A while back my radio shut off randomly so everyone told…

Does anybody know anything about radios!? A while back my radio shut off randomly so everyone told me probably a fuse well we bought a fuse turned out to be the wrong one and we never went back. My question is if I go to one of those places where they install radios will they know what's wrong so I don't buy a new radio and it still not work? We planned on upgrading anyway it just broke right before we could