Quoted from Tridentphoto:So then I suppose it's not odd for lights on the playfield to come on when soldering the coin door switch?
I thought maybe there was something wrong somewhere. Well, there is something wrong somewhere, but I hoped that was a clue. As of yet I can't figure out what the problem is.
The millions digit on the 7 segment display won't light.
When I turn the machine on, there is a strange and arbitrary number in the ball count display, like 57
The rotary turret won't turn, there's a couple switches that don't register on it too, and the ball lock and solenoid don't work.
Whoa there partner...slow down a bit. We all don't want you to move too fast and damage anything.
Agreed as all the others said, first of all - don't solder with the game on.
Second, you need to do a bit of homework. Is this a newly aquired game?...or did these failures occur in your possesion? (i.e. we know they were working now they are not) For our benefit on the board, what is your level of experience with electronics? Have/know how to use a DMM?
There's a lot that should be cursory checks when aquiring a game, and really, should also be done on many of the type of problems as they occur. Namely, checking power supply voltage and condition, checking fuses for condition and value, including the fuse holders. Connectors are huge as well...loose/oxidized contacts and faulty wiring are common.
Start by letting us know what game this is...many things are the same, some things are different. Get a manual and schematics. We can point you to things to check and test. Then pick one specific problem to tackle. Rome wasn't built in a day, but if we work together and do this systematically we can help you repair it as best as possible or point you in best course of action.