Hi all this is my first venture into a solid state machine and it's a whole new world compared to em machines. I bought a Williams contact on the cheap and of course it powered up with no display nor functioning playfield I took the mpu/driver board off and found cold solder everywhere after reflowing everything I put the board back in and realized my solenoid fuse was blown replaced that and turned the machine on that fuse blew instantly but everything else came up I could start a game and it scored moved through the balls and went into game over but no solenoids worked. Now I traced the problem from my power supply to a red wire that goes through a harness then Underneath the playfield to the center pop bumper then jumps off there to every other solenoid on my playfield. I disconnected the red wires from the pop bumper so they were no longer feeding everything else and turned on the machine and the fuse no longer blew. My question is how can I test everything without going broke buying fuses I do have a dmm I know basics with it but I am still really new with solid state machines what would be my next step??

Update: okay so I hooked the red power wire back up and disconnected everything from my driver board and put a new fuse in. One by one I kept putting the connectors back into my driver board I found that 2j11 connector is blowing the fuse. What's working on the playfield now is the pop bumpers all scoring and sounds!! So I am definitely figuring it out what still isn't working on the playfield is my kickers and drop targets now I would assume this means I have an issue with something on my driver board correct?? What should be my next plan of attack??

Ok so nothing seems shorted ohms wise I did disconnect my drop targets and all and plugged back 2j11 to the driver board and the fuse did not blow all the all kick outs and kickers are now working what do you think it could be with the drop targets I have never worked on solid state drop targets before not really sure where to start with them?.

I also noticed that my flippers are not working and fuse is fine another obsticle to figure out.

Two large solenoids and they both were around 3.5 and no there are no small ones to raise them back up individually.

Do the flippers go through the driver board???

Thanks for a response!! If that relay is not clicking what's the best way to troubleshoot that???