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Buzzing Noise w/Keyboard Backlight

w00t951

w00t951

macrumors 68000
Original poster
Jan 6, 2009
1,834
53
Pittsburgh, PA
I just noticed that my Mac makes a buzzing noise due to EMI from PWM. Does anyone know how to fix this?

Running the keyboard backlight at anything other than off/maximum triggers this buzzing.
 
The keyboard backlight needs little current for it to work, if you get the noise when the backlight is on something is amiss, reason is that the buzzing normally appears only when lots of current is needed.
For instance, if you have a 100% load on the CPU, not for a small current from the keyboard backlight.
 
justperry said:
The keyboard backlight needs little current for it to work, if you get the noise when the backlight is on something is amiss, reason is that the buzzing normally appears only when lots of current is needed.
For instance, if you have a 100% load on the CPU, not for a small current from the keyboard backlight.
Click to expand...

No, I've pinned it on PWM used to control the keyboard brightness. I'm at idle, and buzzing is only audible when the keyboard brightness needs to be something other than 0% or 100%.

My question is, is there a way to stop this buzzing? It's slowly driving me insane.
 
w00t951 said:
No, I've pinned it on PWM used to control the keyboard brightness. I'm at idle, and buzzing is only audible when the keyboard brightness needs to be something other than 0% or 100%.

My question is, is there a way to stop this buzzing? It's slowly driving me insane.
Click to expand...

Only way is to service it, that is if it's still inside warranty.
 
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