I have a Macbook Pro running 10.9.3 (13D65), Boot ROM Version: MBP55.00AC.B03 SMC Version (system): 1.47f2

The fans are always running at full rpm and the kernel task used to take up 90% of the cpu till I found a fix that said to remove a plist entry specific to your Model Identifier. The plist was inside /System/Library/Extensions/IOPlatformPluginFamily.kext/ Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/.

This helped the kernel task problem, however the fans are still are running at highest the rpm possible. Recently a new problem appeared, now my Mac will randomly go to sleep mode on its own. I have tried resetting the SMC, but this has made no difference. I tried setting the sleep setting to never but it had no effect. I also tried the apps Caffeine and NoSleep, but they've had no effect either. Is this an SMC problem and if so how can I diagnose the damage? Does somebody know where on the logic board the SMC is, just to check it for corrosion or some sort of damage?

Update: http://pastebin.com/iYxwCi0W EtreCheck on Mavericks Also, I tried to fix the sleep problem by changing the pmset sleep to 0, it worked for a while but its rebooted on its own two times now.

Update: The pmset doesn't really take, however it hasn't restarted on its own anymore. Also the fans are now sometimes running at 230 rpm!

  • In my opinion, there is no way to reliably diagnose the issue once you have modified the contents of that kernel extension. I would either revert your changes there, or reinstall OS X and then return back.
    – njboot
    Commented Jun 12, 2014 at 2:21
  • Well I did save the file, so if I were to put it back and reboot. How would I go about diagnosing it then?
    – mac_33
    Commented Jun 12, 2014 at 2:46
  • 1
    Hard to know without a more comprehensive look. You can run Etrecheck and provide the results with a Pastebin Link if you wish. If you do so, update the original question with the link. Regards.
    – njboot
    Commented Jun 12, 2014 at 3:09
  • What if Yosemite loaded a new SMC to work with the new OS and it's going to be buggy until that OS is released / bugs fixed? You'll probably want to open a support incident with Apple engineering on the developer boards to find out what SMC version you are running or ask here how to determine the proper SMC version for Mavericks.
    – bmike
    Commented Jun 12, 2014 at 12:57
  • 1
    Be sure to open System Information and edit in the specific boot ROM, SMC and system build version on which you continue to have problems. We can't rule in or out Yosemite without those details - for now let's reopen this. Hopefully you have an SMC version that is appropriate for Mavericks.
    – bmike
    Commented Jun 12, 2014 at 15:34

1 Answer 1


Thanks for your help guys, but I decided to take a look at my logic board and found some places that had been corroded. I removed my logic board and gave it a good clean with isopropyl alcohol and a toothbrush and for now my mac has stopped going to sleep on its own, also fans are back to normal. Hope this works out.

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