macbook fans-are they on?

Discussion in 'Mac Pro' started by starstreak, Apr 29, 2006.

  1. starstreak macrumors 6502

    Joined:
    Dec 5, 2004
    #1
    Ok, this maybe the opposite of some people, but how can I tell my fan is on? I dont really hear it, and the air from the back of the unit doesn't seem like its moving much. I do know you dont want to tuch the mac anywhere above the function keys after the units been on for at least 10-15mins.
     
  2. EricNau Moderator emeritus

    EricNau

    Joined:
    Apr 27, 2005
    Location:
    San Francisco, CA
    #2
    Are you running tiger? You could download miniStat2 which has a fan speed reading. (You can use the demo for several days before it asks you to register).
     
  3. aplasticspork macrumors regular

    Joined:
    May 27, 2004
    Location:
    Seattle Wa.
    #3
    I don't believe temperature or fan monitoring are possible on the macbook pros yet, someone needs to figure them out still. Ministat2 doesn't show temperature or fan information for mine. That aside, the fans on the macbook are quite quiet unless they're blowing at full blast, and even then there doesn't seem to be much airflow coming from the back of the machine. I wouldn't worry about it.

    --Andrzej
     
  4. indigoflowAS macrumors 6502

    indigoflowAS

    Joined:
    Oct 31, 2005
    Location:
    Columbus, OH
    #4
    i have only heard my MBPs fans spin up a couple of times, only when i have it on a very poorly ventilated surface (fuzzy blanket, etc.). dont do that just to test out if they work :rolleyes: They wind up slowly and smoothly, hands down the quietest machine i have ever used (aside for the bloody CPU whine that can be shut of w/ the mirror widget):)

    it does get quite hot either way. dont sweat it unless you start seeing issues (kernel panics or melted parts ;) )
     
  5. starstreak thread starter macrumors 6502

    Joined:
    Dec 5, 2004
    #5
    ok so HOT is normal? As in you can burn my finger off if you touch teh wrong spot?
    Oh I dloaded the widget mentioned above. yeah 0 fan speed.
     
  6. vamp07 macrumors member

    Joined:
    Nov 22, 2005
    #6

    Based on my experience and comments here I would say that is normal heat although to get it that hot you usually need to drive the processor hard and also have it resting against something with no ventilation ( a pillow ).
     
  7. Bunsen Burner macrumors regular

    Joined:
    Feb 10, 2006
    #7
    It is very likely that the fans are not coming on, causing the machines to run hot (those that do), because of this.

    BB
     
  8. starstreak thread starter macrumors 6502

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    Dec 5, 2004
    #8
    oh man that is a MESS! If I found out mine was like that I would demand my money back.
     
  9. robert-a-hudson macrumors regular

    Joined:
    Apr 11, 2006
    Location:
    Britain
    #9
    Yeah, above the f keys, mine's hot. As in, put fingers there for about 5 seconds and i wanna take them away. Its hot underneath too, similar, 5 seconds on bare fingers right at the back, and i wanna move my hand.

    But note, both these places are right next to the vent (i.e. by the hinge) so it should be hotest here, as this is right next to where the air is being expelled.
    Note, it is also noticably hotter when on charge than on mains, than on battery.
     
  10. excalibur313 macrumors 6502a

    excalibur313

    Joined:
    Jun 7, 2003
    Location:
    Cambridge, MA
    #10
    Here is the question I have. The processors put out a fixed amount of heat, q. If the thermal paste job is really bad it seems like your lap will feel less of q than if it is phenominal and the heat transfer is really good. Why is it the opposite? Is it that the thermal pipes disperse the heat across the whole underside? Why is it that it isn't until you fix the machine that the fans start working? (it seems to me like the fans probably do a better job getting rid of heat.)

    PS- Has anyone tried doing this? I've built a desktop computer from scratch before and it wasn't too bad. Would this be significantly harder? I'd really like to be able to rest the mbp on my lap but specifically the part of attaching the logic board to the cooling ducts kind of scares me. Is there a clamp like there is on desktops which clamp the cpu to the heatsink? (Sorry I found this out later, screws attach the heat pipe to the motherboard.)
     
  11. starstreak thread starter macrumors 6502

    Joined:
    Dec 5, 2004
    #11
    ok I build computers. Having this much paste is bad. Thermal paste should just be thick enough to fill the gap between chip and the heat pipe. Too much, and there is no contact. And I think part of the issue was the heat sensor wasnt picking up anything becuase of too much paste. It should be put on paper thin.

    I woould try this, but I wouldnt be able to open the macbook. I would rather return the unit under teh 14day return policy.
     
  12. excalibur313 macrumors 6502a

    excalibur313

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    Jun 7, 2003
    Location:
    Cambridge, MA
    #12
    Why can't you open the macbook? It says that your warranty isn't void unless you wreck something.
     
  13. starstreak thread starter macrumors 6502

    Joined:
    Dec 5, 2004
    #13
    I would wreck it. :) I don't have the tools to pop open the case without putting on scratches on the casing. I did that when I did my 12in powerbook when I added in the 7200rpm drive. so now I dont open macs. :)

     
  14. excalibur313 macrumors 6502a

    excalibur313

    Joined:
    Jun 7, 2003
    Location:
    Cambridge, MA
    #14
    So a thought just occurred to me. The problem here isn't so much the excess thermal grease but the fact that the thermal grease is preventing the temperature sensors from feeling this heat increase so the heat instead is dumped into the aluminum case instead of being blown out with air. What about having a temperature monitor program that turned on sooner than they currently do? The whole reason why they don't turn on sooner is just because they don't feel the temp increase. Making them more sensitive should fix this and although it isn't as good of a solution because the processor isn't dumping heat as fast as it could, it doesn't require someone to rip open their macbook.
     
  15. starstreak thread starter macrumors 6502

    Joined:
    Dec 5, 2004
    #15
    That I dont know, but applying too much thermal paste will also raise the temp because of no heat transfer.
     
  16. excalibur313 macrumors 6502a

    excalibur313

    Joined:
    Jun 7, 2003
    Location:
    Cambridge, MA
    #16
    It will raise the temperature of the processor but it will actually be slightly lower for your legs because less of the heat is getting to them.
     
  17. Bunsen Burner macrumors regular

    Joined:
    Feb 10, 2006
    #17
    No.

    The processor temp will rise. Then the heat will soak the mainboard, which, in turn, soaks the case. All because the heat is not getting vented out the enclosure. The heat has to go somewhere.

    The cooling system is quite efficient as long as the fans are allowed to operate when necessary. You've got, at least, a 1.83 GHz Core Duo, an X1600, and the northbridge sharing the same heatpipe. All that is shoehorned into an enclosure less than 3/4" thick! The fans must run to keep the thing cool.

    BB
     
  18. excalibur313 macrumors 6502a

    excalibur313

    Joined:
    Jun 7, 2003
    Location:
    Cambridge, MA
    #18
    The point I'm trying to say is that it is the fan that is keeping this thing cool, not so much the thermal paste. Even with a piss poor thermal paste application it won't affect the temperature as much as a fan not turning on.
     
  19. Bunsen Burner macrumors regular

    Joined:
    Feb 10, 2006
    #19
    Absolutely. Unfortunately, for Apple, the too much thermal paste is also keeping the fans from running!

    BB

    P.S. I was up your way last summer, on Chebeague Island. Beautiful. Got to go back...
     
  20. mmmcheese macrumors 6502a

    mmmcheese

    Joined:
    Feb 17, 2006
    #20
    My fans rarely come on...only when on a blanket or something...and they are very very quiet...you have to listen really hard to hear them....it's almost like a moaning wind sound (like when there's a storm outside)...it's kind of funny.

    EDIT: The only time it really feels hot is when the fans actually come on, and that's rarely. Even then, it's not like you'd actually burn yourself or anything.
     
  21. dmw007 macrumors G4

    dmw007

    Joined:
    May 26, 2005
    Location:
    Working for MI-6
    #21
    Same case with my iBook G4.

    In fact, the fans came on only once so far.
     
  22. excalibur313 macrumors 6502a

    excalibur313

    Joined:
    Jun 7, 2003
    Location:
    Cambridge, MA
    #22
    So could a program be written that could customize the fans to come on at a lower temperature? (they aren't bios controlled right?) It seems like all the programs made for the g4s fans don't work so hopefully a new program is released soon.

    Bunsen- Yeah, maine truly is a wonderful place...it can be a bit cold in the winter sometimes.
     
  23. mmmcheese macrumors 6502a

    mmmcheese

    Joined:
    Feb 17, 2006
    #23
    my iBook G3 only had the fans come on in the summer, while playing a movie for longer than 2 hours....which is a good thing, because those fans screamed like a banshee.
     

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