How to re-calibrate the fans on my dual 2.0Ghz PowerMac G5?

Discussion in 'PowerPC Macs' started by PowerMac G4 MDD, Oct 13, 2014.

  1. PowerMac G4 MDD, Oct 13, 2014
    Last edited: Oct 14, 2014

    PowerMac G4 MDD macrumors 68000

    PowerMac G4 MDD

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    #1
    Hey everyone,

    So I just changed out the hack-job white LED lighting system in my G5 to similar LED lights that change colors. Right after doing this, I noticed that the fan, which sits in front of the mid-section of the G5 (behind the frontal grill of the computer, right underneath the optical drive) spins much faster than before... IDK if it's some strange coincidence, but it would always run at a much lower speed. (still spins fast while idle now).

    Anyway, to be safe, I still want to do a fan calibration. I know that you have to have Apple's diagnostic disc to boot from, then you select the calibration test.

    Question: Is it necessary to do this test if I haven't done anything like reseated the CPUs? I just want to make sure my fans aren't running faster or slower than they need to be.

    Also, WHERE do I obtain this disc or disc image? Is there a free download somewhere for this hardware diagnostic disc?

    -Thanks (gosh, this frontal fan is bugging me...)


    EDIT: I did the calibration test (even though it said it was not necessary) and I guess it really WASN'T necessary. Yet, this fan is still running so much faster! It's really annoying me.
     
  2. weckart macrumors 68040

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    #2
  3. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #3
    I have 2.5.8 that I can Dropbox if you need it. Small download and will fit on a CD.
     
  4. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

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    #4
    Sorry about that; It's a 2003 dual (two CPUs, according to System Profiler) 2.0Ghz 7,2 PowerMac G5.
     
  5. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

    Joined:
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    #5
    That would be great! As far as I have seen, downloads for these things aren't really around. Do I need an account to receive the file or just a link to your shared items? (sounds like a n00b question, but I am not quite certain since I haven't used the Dropbox application itself).
     
  6. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #6
    You won't need an account or the desktop app. I'll upload it right now.
     
  7. Altemose macrumors G3

    Altemose

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    #7
    Apple Service Diagnostics 2.5.8 allows for a calibration to be done at any given time. 2.5.7 and below have a set list of requirements in order to allow calibration. Since you did not remove the processor you should definitely use 2.5.8.
     
  8. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

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    #8
    I am running 2.5.8 now. It said I didn't need calibration, however I did it anyway in hopes of it unknowingly fixing anything that COULD be wrong... I left it while I ate dinner, came back, and can see that it is STILL testing CPU 1. Why is this thing hanging?
     
  9. Altemose macrumors G3

    Altemose

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    #9

    Calibration can take 30-45 minutes depending on the machine.
     
  10. HereBeMonsters macrumors 6502

    HereBeMonsters

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    Fareham, UK
    #10
    There isn't a temp sensor you've accidentally disconnected?

    I had a similar thing on my Mac Mini, found out I'd not reconnected a temp sensor when re-assembling the thing, so it ran the fan at 100% at all times as a precaution.
     
  11. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

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    #11
    I don't think I touched anything while installing the lights. Some are closer to that fan... I wonder if the lights are causing the temperature sensors on the fan to think things are getting hotter... then again, the lights barely give off heat.

    ----------

    Yeah, it ended up finishing with no issues... that one fan is still running fast though.
     
  12. Altemose macrumors G3

    Altemose

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    #12

    Have you tried seeing if both CPUs have a similar temperature? You can view this in iStat Menus or Temperature Monitor. Within 10 degrees Fahrenheit of each other is normal.
     
  13. DeltaMac macrumors 604

    DeltaMac

    Joined:
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    Location:
    Delaware
    #13
    Just that one fan is running fast - the one that is on the same bracket with the internal speaker?
    I wonder if the thermistor (temp sensor) might be an issue?
    Open your side cover, then look on the front edge of the shelf that divides the PCI slot area from the logic board. If you look carefully behind the front grill on that front shelf edge, there's a small black bracket. There's a small temp sensor that should be clipped to that bracket. The little cable attaches to a connector on the logic board almost directly behind it. That cable is only about about an inch long, and may just need to be reseated, and the thermistor/sensor just feeds through that small bracket - that end can be left loose, too, because it's really short. Good luck on reseating that connector without pulling the logic board out.

    If you added some LED lighting behind the front grill, you may have inadvertently moved that cable, maybe even unplugged it.
     
  14. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

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    #14
    The CPU temperature has not changed since I purchased this Mac; It's just this dang fan. Right now A is at 116F and B is at 99F. (with this Webkit page open and iChat and Mail hidden)

    ----------

    Yep, it's the one on the same bracket as the external speaker. When I wake the computer up, it begins to spin at the speed it used to rotate at before putting in the LED lights, but after 5 seconds, it speeds up. I'll go ahead and inspect it as you have said. Thanks for the info; I will update you if something happens or doesn't happen.
     
  15. PowerMac G4 MDD thread starter macrumors 68000

    PowerMac G4 MDD

    Joined:
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    #15
    Okay, well I opened it up, checked out the thermal sensor, and everything seemed okay with it. I then put a bedroom fan to cool off the unit to simulate a cold start-up. I disconnected the plug in my lights in case they were creating too much extra heat. I powered the machine on... and the issue persists. It's odd; maybe this is some unfortunate coincidence? It would be funny to hold an ice pack on the thermal sensor and see if it even works xD. I don't feel like disassembling my set-up again today, though.
     

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