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iMac A1418 - Fan spins high when turned off, normal when running.

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  • #16
    Originally posted by dukefawks View Post
    "The fan still spins high when the iMac is turned off. :'("

    This is why you measure before just throwing parts at it. I see no reason why an S5 FET would cause the fan to stay on anyway. Fan runs off 12V_S0, so that bus is staying on. So Q7950 is a more likely candidate but measure first the enable and gate. Use brains, no plz Bro solutions.....
    I can't bench test an iMac board which means I can't measure it. This is maybe the third iMac I've worked on.

    That said, I understood the problem differently to you; not that S0 was staying on but that S5 was sending 12v to a rail it shouldn't. But then fans run off PWM anyway so it would require a signal and not just 12v.

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