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Treadmills come in 2 usual flavors, 3 phase brushless and then there's brushed DC.
This power board had a popped fuse which means there's a short -somewhere. Let's find it.
In the video I generically call 2 components "mosfets" - which I knew better.
In this design an Insulated Gate BiPolar Transistor (IGBT) is pulsing DC to the motor (to control speed) while the other component is a fly back diode (free wheeling diode) for emf. (see my other treadmill repair video for replacing defective fly back diode).
An alternate design uses an H Bridge and 4 mosfets to control speed and direction.
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