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Apple Computing Products:
macOS - Notebook Hardware
SMC has given up on fan control
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<blockquote data-quote="BrianLachoreVPI" data-source="post: 1326468" data-attributes="member: 193366"><p>Well- you really can't rule out HW based on the information you've provided. You indicate that the fans (you don't say which ones and I would be surprised if they were all behaving exactly the same way) respond to SMC control - but slowly and never exceed 3500 rpm in spite of being told to. You say they don't ramp up themselves at all - even if the CPU is baking. You're really only left with HW issues - but potentially 2 of them if what you're saying is true. Your temp sensors must not be working correctly, because the data paths for the fan instructions are fundamentally the same AND your fans must have some issues since they can't reach max speeds and respond very slowly. I think you're definitely looking at a HW issue - but difficult to say exactly what from here.</p></blockquote><p></p>
[QUOTE="BrianLachoreVPI, post: 1326468, member: 193366"] Well- you really can't rule out HW based on the information you've provided. You indicate that the fans (you don't say which ones and I would be surprised if they were all behaving exactly the same way) respond to SMC control - but slowly and never exceed 3500 rpm in spite of being told to. You say they don't ramp up themselves at all - even if the CPU is baking. You're really only left with HW issues - but potentially 2 of them if what you're saying is true. Your temp sensors must not be working correctly, because the data paths for the fan instructions are fundamentally the same AND your fans must have some issues since they can't reach max speeds and respond very slowly. I think you're definitely looking at a HW issue - but difficult to say exactly what from here. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
SMC has given up on fan control
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