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Mac classic blows MOSFET

Yes. 

If the IC goes bad for any reason, the VCC supply to that IC could spike beyond the capacitors ratings and damage it internally. 

Case in point: I used to work on Infocus LP520 and LP540 projectors back in the day. 

There is a Viper100A switching regulator ICs very similar to that one that use a capacitor as a VCC bus filter. when that IC goes bad, it literally launches that capacitor across the room and leaves paper and foil everywhere. 

So yep. 

 
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