Trying unplugging the sound board and see if it boots.
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So then if the solenoid driver is showing 4v on the test points, that isn't going to boot the mpu. So I would check/reseat J3 on the SDB to see if the voltage improves. If it doesn't then swap solenoid driver boards with a different game to see if it is the SDB. If voltage is still low and the connector J3 has been recently rebuilt, then its the power module.
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