Hi! I hope someone familiar with system 3 boards or boards in general could give me some insight on what might have caused this catastrophe :O
I picked up a Lucky Seven (ss),cleaned it and made sure all fuses were replaced with correct value. It booted and seemed to work except the different reel combinations did not light the corresponding lights (only for a couple combinations), and dropping the targets did not award the value. I cleaned the reel circuit boards with some rubbing alcohol, without much change. Upon troubleshooting with the game in-play, suddenly i notice (and heard) the center reel coil was being locked on by itself. I pressed a switch to advance it, and it got unstuck. But at that time it was REALLY hot. I turned off machine and let it cool down. Then i turned on and started a game to trouble shoot. Now the lights were all wonky, blinking or being on when they shouldnt, and the coil at intervals locked on again. Thats when we started smelling burned electronics. Turned off machine, opened the backbox and HOLY CRAP, all of the...resistors (?) / Capacitators on the MPU board was literally black and melting, looks almost like it was fully burning!
Very severe, and i am kinda scared because I dont know what might cause this extremity?
Dont want to plug in a new rottendog board if the same might happen to it.
If you look at the pre toast photo, the column that burned seems a little brittle, so maybe they were already failing`?
The reel circuit boards should not affect the reel coil, as it only indicates what lights and value should be lit. Can there have been failing components on board from earlier, making it lock on by itself?
Any help appreciated!