We maybe wrong about the whine

If the cpu whine only happens when the cpu is idle then try this. Run the MBP on battery, move the pointer around abit and you'll hear the whine. Now dont touch the keyboard or trackpad for a couple of seconds, and the whine goes away. So how can this be. I mean if the whine happens when the cpu is idle it is surely just as idle if not more so when there is no user input.
I wonder if the whine we are hearing somehow a result of the graphics card. I have heard the same sound produced by 3dfx and nvidia cards in pc's before. Perhaps the aggressive power management on battery in mac osx is causing the graphics card more problems than the cpu.
Infact it was the internal pc speaker picking up on interferance caused by the graphics card.
If there is an internal system speaker in the mbp then perhaps this is the issue.
If anyone has any good points for or against i would like to hear them, please no trolling or flames.
Regards,
Boozy.

Interesting theory.
But if its the graphics card or an internal speaker
picking up interference, then why do QuietMBP and the
Photobooth and the widget/ whatever other workarounds
there are work?
And regardless of what is causeing it...why is it
only a problem in some MacBook Pros, not all of
them?
Thirdly, somewhat off topic, my PC makes a high
pitched whine when it is turned off. It seems to be
coming from the PSU. *confuzzled - this is something
new*
Once again I must start by saying I do not own a MacBook Pro (yet), nor am I any kind of hardware expert. That said your probably right, I doubt it's the graphics card that is making the whine. It is possible, however, that it's the Intel Core Duo chip itself that is interfering with the speakers. Perhaps the interference is only picked up when the processor idles (which would explain why the Photobooth and QuietMBP fixes work). Mutting the speakers (as suggested in the other thread) would probably not fix it either as the speakers would still have power, they just wouldn't be recieving a signal from the MacBook Pro's sound card. Again, this is only something I read on another post so it's nothing I've had first hand experience with, I just wanted to make sure all sides were being shown.

Similar Messages

  • About the whinning noice

    Hello everyone,
    These days I have been reading about the whinning noice issue. Suddenly, something about Physics came across my mind. It maybe a joke. The new CPU in MBP Core Duo has two core. Does that mean there are two source of high fequency waves? Interference occurs sometimes, especially when Constructive Interference occurs, you hear the whinning noice. What do you think?

    Directionality of the output can be explained by more things than interference phenomena.
    In fact, for interference to explain the observation, the frequency characteristics would have to be very pure. And the sound I've heard is far from a pure tone. Also, the sound would have to be phase-coherent. There could be no significant multipath. (These are the same characteristics that describe laser light.) Considering the baffle provided by the keyboard, freedom from multipath and phase coherence are unlikely to be present.
    Lastly, keep in mind that higher frequencies are much more directional.
    All that said, I, too, notice that the sound, which I can hear only in my office environment—never at home—varies considerably with the relative position and orientation of my head w.r.t. the computer.
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  • New info about the whine, could this be true?

    We all call the whine you get when your are idle called the CPU whine. I believe we discussed how the spinning or some field that produces the sound that we hear. Well according to one person at the apple store he says it is coming from this speakers. He said that the "tiny electromagnetic field that the processor creates has some how maybe through wireing or that the speaker is so close to the field that the speaker amplifies the sound." Now what I want to know is if this could be true or this could be the case. If it is the case, the problem might be a little easier to fix, but then again, why does it go away at different times? And I quote again "different usages could create a different field which would produce a different sound." Well this is deffinately a new idea that I don't remember talking about.

    The Power converter is the most likely source of the whine (singing). When you run a CPU intesive app., the CPU is drawing more power, causing the power converter's operating point to change. It's probably still singing, just a tune higher than you can hear.
    The AC Power converter is a Switched converter (transistors called FETs are turned on and off to "chop-up" the AC source voltage/current,) and this allows the converter to change the Power from 115V AC to say 9-12V DC.
    The switching frequency (or a harmonic of that frequency) is what you are hearing, and specifically what your are hearing is either the vibration of the plates or the copper coils in a transformer.
    Common switching frequencies of AC/DC converters today is typically anywhere from 100KHz up to several megahertz (MHz.) It turns out that the higher the switching frequency, the smaller you can make the Power Brick. Human Hearing is usually in the 10Hz to 20KHz (for the gifted.)

  • Funny Thing about the Whine!

    I am one of the fortunate/unfortunate people that have the whining MacBook.
    Since it happens at idle maybe its Apples way of saying:
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    I tried my very best to check this notebook out before paying $2,600.00
    Hours later I discover the screen has "noise" and the cpu/powersupply or what ever is also making the "noise"
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  • New thing about the whine...very very strange

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  • My theory about the whine

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    MBP 1.83Ghz, 2Ghz   Mac OS X (10.4.6)  

    The whine was surely not an AC related problem in may case. I had a 2GHz 15.4 beginning of April. It had the whine in a big way. Took the machine back, because I work a lot of the time in the quiet, and it drove me mad in just one day. There were no machines on stock that didn't make the noise, so I got my money back.
    If I used the machine (touched the pad, or used the keyboard, the sound stopped. Within seconds of stopping work, the sound started again. Running the camera stopped the noise too. I don't see why I should have to run my camera every time I start up, just to fix apples mistakes though.
    Well hopefully they've sorted it out now...
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  • The Official "I Called Applecare about the Whine" Thread

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    after 3 weeks of calls they accepted the POS back as faulty
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    came back exactly the same
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  • Something wrong about the update,why?,what should ...

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    youre question,and answers,every thing you know about it ,but it here!

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  • The Whiner is away, how do I get a good one?

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  • Physical reason of the whine (CPU, LCD) - explanations and suggestions

    Hi everybody,
    a friend of mine just received his MacBook Pro (2 Ghz, 2 GB RAM, 5400 RPM 100GB HD) yesterday.
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    The book has the whine (high pitched tone, very nasty). It is even louder when running from battery.
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    If you have the high-pitched whine that changes with LCD brightness, that is a recognized problem and can be fixed by changing the inverter board.
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  • What is it talking apple so long to create an update for the whine issue?

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