It’s a bit of pain that it happens as soon as you buy your first pinball machine. Has the person that sold it to you given you any support?.
It does sound like one of the flipper transistors Q15 or Q16 has blown and needs replacing. I had the same thing happen to me years ago on a Metallica machine.
It’s best to replace both of them whist at it.
You might need to send the board off to someone who is handy with a soldering iron. The chips are very cheap, it’s just the labour to do the work. The good news is SAM boards are quite easy to work on before they switched to surface mount chips on Spike boards.
It does sound like one of the flipper transistors Q15 or Q16 has blown and needs replacing. I had the same thing happen to me years ago on a Metallica machine.
It’s best to replace both of them whist at it.
You might need to send the board off to someone who is handy with a soldering iron. The chips are very cheap, it’s just the labour to do the work. The good news is SAM boards are quite easy to work on before they switched to surface mount chips on Spike boards.