Quoted from misterhare:Hi all,
I need some help again. I tore everything down to get it cleaned and shopped. I put it b?ack together and everything seemed to be working fine. Today I was playing and started smelling something and then I lost all the functions related to the f5 fuse on the power board (slingshots, pop bumpers, drop target, laser kick). The fuse blew so I replaced it and those features still don't work but the fuse continuity tests out okay.
The game boots up and allows me to hit the start button but it freezes on the sunset image on DMD and all that happens is the launch coil keeps firing. Not the upkick. So there is no ball in the rail and the launch coil keeps firing. Here is an image of the frozen screen. https://photos.app.goo.gl/mo4JgPnyTEjfN8kF6
I checked continuity on all the bridge rectifiers related to the features and the continuity checked out. Any insights are appreciated. I'm stumped and sad. Just got this pin up and running!
I route this game and am pretty familiar with it. Based on your initial description I thought you fried a coil, in which the transistor driving said coil shorted, locked the coil on, and overheated it. However, it sounds like something upstream on your low power coil circuit has blown. If you smelled something burning, the fuse blew, and now a good fuse remains good and the low power coils aren't working, the first thing I would check is the backbox. I believe the fuse you replaced is either on the small PPB board or in one of the fuse holders attached to the metal ground plane in the backbox. You may still have a fried coil, which was likely caused by a bad transistor on the CPU/driver board (the large board). Do you see or smell anything unusual on either the smaller PPB board or the large driver board? The PPB is a rectangular board with several fuses in the bottom left below the power supply.