You’ve got a shirt somewhere. Test points ok? Make sure the flipper has the appropriate voltage, and start checking wires
(Topic ID: 243504)
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Doctor Who
Bally, 1992
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The 20V is unregulated so it will jump All over the place- it should be around 20V though
The 5v sounds like your
Biggest issue. Try reseating the Ribbon cable between the MPU and the power board. That can get corroded and stop sending signals consistently
Doctor who needs a REALLY stable power situation because of the mini playfield. You may also consider changing out the 5v power regulator to a P5US which is a life saver and does not get hot at all
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