Hi guys, I bought this unit used and suspect it took a whack by previous owner likely using it with an amplifier. When i decided to open it up to have a look and confirm jumper settings i noticed the stock light bulb/ fuse was cooked. I replaced it with another similar 12v bulb figuring this was the issue where the unit basically did nothing when powered on / tweaked adjustments etc. So, im assuming this thing took the juice and something else in there on the board may be shot. Anyone have any experience fixing one of these that suffered power hit ? Thx