12" G4 Powerbook fan replacement? Or logic board?

Discussion in 'PowerPC Macs' started by supaflyryan, Nov 18, 2007.

  1. supaflyryan macrumors newbie

    Nov 18, 2007
    My girlfriend has a 12" G4 Powerbook that she claimed was getting really hot. I noticed it was as well, so I installed iStat Pro and saw that the fan was spinning at 0 RPM. So obviously something is wrong.

    I read a few posts on people having problems with the logic board, which would also cause the fan not to work. However, the computer runs fine, the fan just doesn't turn on when it gets hot. I haven't (and don't plan to) let it get so hot that it would shut itself off or burst in to flame or whatever happens.

    I understand it's out of Applecare, but I would prefer to fix it myself on the cheap. I'm perfectly capable and willing to replace the fan, but before I crack it open I would like to know if there is a simple way to see if my problem is simply a dead $30 fan, or a $500 logic board.

    Anyone have any advice?
  2. supaflyryan thread starter macrumors newbie

    Nov 18, 2007
  3. CRAZYBUBBA macrumors 65816


    Mar 28, 2007
    i can't help but logic boards can be had for a max of $250 on ebay. and ifixit.com
  4. FireArse macrumors 6502a

    Oct 29, 2004
    G4 fan

    If you can try get hold of the service diagnostic disks - it'll warn you if the fan doesn't reach the required speeds. I think you might be able to take it to an Apple Genius Bar, if you specify exactly what you want, they could do it there. 5 min job.

    A new MLB is far more costly than a heatsink + fan!

  5. supaflyryan thread starter macrumors newbie

    Nov 18, 2007
    Well I know the fan isn't spinning. That's been proven by iStat Pro and the fact that the fan doesn't turn on.

    I want to know if there is a way I can tell either with the computer running or all taken apart what the faulty part is. I don't want to buy both and then try swapping them out, or buy just the fan and realize that it was the logic board after all.

    There aren't any symptoms that are unique to either part?
  6. California macrumors 68040


    Aug 21, 2004
    The problem with replacing a fan on the 12" PB is the labor. Frankly, if she has a 1 gig machine, I'd buy a 1.33 or 1.5 ghz logic board and upgrade the thing instead of just replacing a fan. In the meantime, have her put one of those blue ice packs on it... she can fry her hd and other parts if it gets too hot. and if you do replace the logic board, I'd put a new superdrive and hd in it as well. Same amount of hard labor to open up those babies.

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