Had this old Alpine in storage for decades. I hooked it up and it worked great for a few weeks. All of a sudden when I had it cranked pretty loud it turned off and blew a fuse. I think it was an improper ground. I added a better ground but now the 6 green buttons in the upper right stopped working. The tape deck and radio work fine though. Can anybuddy chime in on this? Is it worth repairing? Is there a an internal fuse possibly?