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| Mac classic blows MOSFET |
Posted by: bengi3 on 2018-06-01 22:23:40
Can that cap go bad after a short that blow fuse and mosfet?
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Posted by: techknight on 2018-06-02 14:57:01
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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Posted by: timoog on 2026-02-13 10:52:58
the 47uf 25v capacitor is a critical one. Without it, the IC will fail. Hi @techknight is that CP15? and can an 'ordinary' electrolytic aluminium type capacitor be used - looks like some special kind of capacitor? cheers! |
Posted by: timoog on 2026-03-11 10:11:38
Took the board out I see that must be CP4 |
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