Pismo fan dead? Something else?

Discussion in 'PowerPC Macs' started by rootsmaneuver, Jul 9, 2010.

  1. macrumors member

    Joined:
    Mar 22, 2006
    Location:
    Wisco
    #1
    I have an old, trusty 500 MHz Pismo. She's not my #1 ride anymore but the other day I was taking her for a spin down memory lane and noticed she was getting HOT. Much hotter than I ever remembered. So I popped off the keyboard to have a look inside and noticed the exhaust fan wasn't spinning. For as hot as she was, I wasn't surprised.

    Now I'm considering replacing the fan but wanted to ask this knowledgable community for any suggestions first.

    I could just by the replacement fan and swap it out but I am wondering if there is anything else that could be malfunctioning and causing the fan to NOT spin up - anything I can check before forking out the cash.

    Is there a way to see if the temp sensor is working? Could it be the LB? Can I test the electrical supply to the fan by using a multimeter? If so what setting/voltage, etc should I use to read that? And lastly, is there more than one fan?

    I'm hoping someone in this forum has had a similar situation, reads this and can comment on it. Thanks in advance to anyone who replies.
     
  2. macrumors 6502a

    Joined:
    Aug 7, 2008
    Location:
    In OSX Snow Leopard / Godalming UK
    #2
    relay any voltage if the fan is not spinning but i believe it should be about 5v
     
  3. thread starter macrumors member

    Joined:
    Mar 22, 2006
    Location:
    Wisco
    #3
    Yep, it reads anywhere from about 3v to 4.5v at any given time. Its appears to have power so I'm gonna buy a fan. Thanks a ton!
    :):apple:
     
  4. macrumors 6502a

    Joined:
    Aug 7, 2008
    Location:
    In OSX Snow Leopard / Godalming UK
    #4
    yup that sounds about right
     

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