Sounds like faulty capacitors for the +5 volt. Or broken / missing diodes on the flipper coils.
If it is the capacitors then more than likely all the other electrolytic capacitors are cactus or on their way out also.
also try reseating the plugs on J102 & J114 on the power driver board and J210 on the CPU board in case its just a bad Connection.
Bad solder joints on those plugs ,the bridge rectifier or the 5 volt reg can also cause this to happen.