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10.4: Avoid a noisy hissing problem on MacBook Pros
Authored by: diamondsw on Mar 03, '06 08:02:20AM

Note that this is not a universal fix, although it has been reported elsewhere. For instance, this does nothing on mine.

On my MacBook Pro, there are three distinct noises:
1) A quiet hum from the upper left, which is always there
2) A quiet buzzing when running on battery power
3) A high-pitched whine when running on anything but full screen brightness

Now, before anyone panics about these, the only one I can usually hear is the first one, and it's more white noise than anything else.



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10.4: Avoid a noisy hissing problem on MacBook Pros
Authored by: StevenRiggins on Mar 03, '06 08:59:13AM

The screen noise is a bad power inverter. Apple knows about it (according to Apple Discussions) and will repair it. The cpu cycling is fixed by PhotoBooth, Mirror Widget etc because it keeps a more even (power hungry) load on the cpus, opposed to running the cpu, powering it down, running it, 1000 times a second. I guess some cpus are more sensitive to this (or the switching power supply to the cpu)



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10.4: Avoid a noisy hissing problem on MacBook Pros
Authored by: latchkey on Mar 03, '06 09:05:35AM

I have problem #3 and the camera on trick doesn't work for it. I was told by an apple store 'genius' that it is probably a bad power inverter and that I should have my machine considered DOA and he gave me a fedex label to send it back and that they would send me a whole new machine (who knows if it is going to fix the problem... I'll just keep sending it back until it does). There is a ton of people talking about this on the apple discussion forums so it is a really common problem. Can you say brand new hardware? =)

http://discussions.apple.com/thread.jspa?messageID=1831110

In fact, here is a pretty good recording of the high pitch noise I was hearing that is refereced from the link above. It's painful to work with.

http://homepage.mac.com/jimdufek/mbp/movies/squeal_noise.mov



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10.4: Avoid a noisy hissing problem on MacBook Pros
Authored by: kuruption on Mar 03, '06 06:22:37PM

So I've had my MBP for over a week now and never noticed any hissing until reading this little "hint".

I have to say, the only way I was able to really hear it was to mute the tv, turn off the other computer in the room and put my ear within 1" of the camera, and THEN I was able to hear it. Yes, it goes away when I open Photo Booth or some other camera app.

So it seems like if you don't have your ear an inch away from the camera and have a ambient room decibal value above that of outter space, it isn't an issue.



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10.4: Avoid a noisy hissing problem on MacBook Pros
Authored by: diamondsw on Mar 03, '06 06:54:08PM

Cancel that - noise #2 disappears when using Photo Booth, or when disabling one of the processors. Noise 3 is still present.

Hmmm - still not sure if it's significant enough to warrant replacement. Mine is nowhere near as loud as the others on the discussion - it probably wouldn't be audible in a busy Apple store. However, in my quiet office (with a few fans running but little else) I can hear it.

I just hope it doesn't turn into something nasty the day after the warranty expires. :(



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