I'm struggling with a Teenage Mutant Ninja Turtles flipper board. The right flipper is stuck in the up position as soon as I start the coil test and the switch test also says that the flipper switch is activated, but when I push the flipper button I can see the red led on the flipper board flicker, which suggests that the switch is fine. So I'm thinking maybe I have two problems: Q5 or Q7 is bad, which would explain why the cpu sees the flipper button as pressed, and one of the transistors for the coil power is shorted, causing the flipper to be stuck up. But Q5 and Q7 measure the same (I'm no expert though) and so do all of the large transistors (the TIP32 and TIP36). I'm not sure what the pre-driver is for the TIP32.
When I disconnect CN1 the flipper comes down. So that indeed suggests that the flipper switch is activated. But the way I read the schematics (and I read schematics pretty terribly) the +5V is on that connector so the board logic circuit is dead once you remove that. That would also explain the flipper coming down, right?
Worth noting also is that the 50V fuse blew pretty soon after I started experimenting with the machine. I know that it was working at one point because the first time I ran a coil test the right flipper went up with force and now it doesn't do that anymore. Could be caused by the flipper being stuck in the up position. I don't think it was constantly powered with 50 volts though.
Another thing worth noting is that the transistor for the A/B relay was toast, but that looks in no way related. And it's fixed now, all flashers work and so do all 34V coils.
Any thoughts? I'm not sure if I should just start replacing all these transistors or if there's anything I can do to figure out what is going on.