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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > weird sizzling noise under my keyboard on powerbook 17 rev A

weird sizzling noise under my keyboard on powerbook 17 rev A
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Join Date: Aug 2002
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Sep 2, 2004, 01:03 AM
i notice this weird sizzling noise under my keyboard... especially when its really quiet in my room... it changes pitch and stuff, especially when i scroll in windows... the noise stops.. and at times when loading pages off the internet it will make weird sizzling noises, its not my HD nor the fan, its a weird noise, not sure if its just me having this problem, can someone help?
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Join Date: Mar 2004
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Sep 2, 2004, 04:55 PM
ive actually been ahving the same problem, i dont think its an issue. i belive its the processor smooting the scroll, or the video card. it also happens with expose.
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Join Date: Sep 2000
Location: Rochester, NY, USA
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Sep 2, 2004, 06:32 PM
My wife is hearing a similar noise with her 1 GHz TiBook. It changes pitch when the cursor moves. It just started a few days ago. It sounds like it is coming from underneath the top left corner of the keyboard. Taking off the keyboard shows a big heat sink in the area where the noise is coming from, which I suspect is where the video hardware lives.

Some searching yielded these relevant threads:


One poster mentioned that his inverter board (which controls the backlight) was making the noise. I can believe this - I have one of those iBooks whose logic board and inverter board were prone to problems, too.

Another poster mentioned that setting the processor speed settings under energy saver to "reduced" can make the noise go away. My wife tried this, and it does seem to work for her -- but the TiBook is running noticably slower.

We do have AppleCare on the laptop, but it would be a pain for her to send it in, as it's also her work machine.... oh well, we'll find something else to use while it's away...

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Join Date: Jun 2003
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Sep 3, 2004, 03:29 AM
My PB17 Rev. A had the same "problem".
The sizzling noise comes and goes as it pleases.
I can go months without hearing it - and suddenly it`s back for a few weeks.
If I doesn`t bother you just ignore it; it`ll stop all by itself.
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