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24" iMac Owners: Does your iMac hum at low brightness?


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24" iMac Owners: Does your iMac hum at low brightness?
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MBHockey
skates=grafs
 
Join Date: May 2005
Location: New York
 
2006-11-24, 23:09

Because mine does, and it seems from reading various forums and reviews that they ALL do. Granted, the circumstances must allow for a completely silent environment to hear the hum, but late at night, or early in the morning it is definitely there and annoying.

I don't know much about why there is a hum, but it's quite bothersome for a $2500 machine
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drewprops
Bastard
 
Join Date: May 2004
Location: Atlanta
 
2006-11-24, 23:32

Mine knows all the words.



Seriously, first I've heard of the humming iMac.
I have a 20-incher and haven't had it in a quiet enough situation to ever hear a hum but it sounds like this is a 24" thing, right? It's an engineering feat to squeeze all that stuff into the iMac enclosure... I expect that it's the power supply making the noise.

Steve Jobs ate my cat's watermelon.
Captain Drew on Twitter
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Windowsrookie
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Join Date: Oct 2005
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2006-11-24, 23:46

Nope, it's the backlights that hum. It's a known problem. But not really anything you can do about it.
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doublem9876
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Join Date: May 2005
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2006-11-25, 00:47

My first gen MBP always hums when the backlight goes down anything past max.
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steve77uk
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Join Date: Dec 2005
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2006-11-25, 03:29

Yep, mine hums too...

Pretty annoying after a while, I have set it so that it doesn't dim - doubt Apple will do anything about it, it says it is whisper quiet in their own marketing, but doesn't mention it hums - I mean with these Macbook Pro's whineing, will the next Mac Mini whistle?
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Think
New Member
 
Join Date: Nov 2006
 
2006-11-25, 19:56

Pretty much all LCD screens have a screech or hum to them when they're set to low brightness. As far as I can tell, it's because of the lamps, as has been mentioned before. My 15" LCD, my 17" LCD, and my 20.1" Widescreen LCD all have the same issue. My ears are especially sensitive to higher pitches, so I can't bear to have my 20.1" on anything but full brightness, unless I want a headache.

It really is a shame that LCD screens are that way. In most environments it's really not a big deal, but late at night in a dimmed room, where I do most of my computing, it's a shame having to choose between burnt out eyes or ringing ears.
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jdcfsu
Veteran Member
 
Join Date: Jun 2006
Location: Florida
 
2006-11-25, 23:43

Nope, I can't say that mine does. It's pretty much silent.
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zippy
Veteran Member
 
Join Date: Jul 2005
Location: Unknown
 
2006-11-26, 02:59

I have to put my ear so close to mine that I can feel the heat from the screen before I can hear anything. From normal viewing distance - dead silent.

Do you know where children get all of their energy? - They suck it right out of their parents!
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MBHockey
skates=grafs
 
Join Date: May 2005
Location: New York
 
2006-11-26, 10:24

Yeah about the same here. I'm not sure it really bothers me enough to send this otherwise perfect machine back
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digitalprimate
Senior Member
 
Join Date: Jan 2006
Location: Antwerp, Belgium
 
2006-11-26, 11:06

Quote:
Originally Posted by Think View Post
it's a shame having to choose between burnt out eyes or ringing ears.
Maybe for the time being you could put a grey film over your screen, so that it dims the light. That is, until you or Apple found a better solution to the problem.
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Bryson
Rocket Surgeon
 
Join Date: Feb 2005
Location: Whitby
 
2006-11-26, 14:09

Some Lee Filters or Rosco Neutral Density should do the trick.
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dfiler
Veteran Member
 
Join Date: May 2004
Location: Pittsburgh
 
2006-11-27, 08:02

My 24" iMac hums no matter the brightness setting. Making it dimmer simply makes the hum louder.

When the iMac is cold, the hum oscillates in volume. When the machine warms up to normal operating temperature, it returns to a constant hum.



The hum is audible from anywhere in the room or even in the hallway. Sometimes the hum disappears for a few hours but it is nearly always present. While not loud, it isn't very white-noise-esque. It is a definite pitch that drowns out all fan noise completely.

I haven't decided if it is worth trying to get serviced. My understanding is that apple doesn't have a policy on the hum and a replacement machine is the current solution.
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mdrandall
 
 
2006-12-15, 05:13

My imac 24" suffers from the 'hum' when on low brightness. However, I have found that setting the brightness to full and then using the utility here http://www.splasm.com/products/productbrightness.html
there is no hum. Also it is possible to set the brightness much lower than the standard Apple display preferences.

The only downside is that the utility runs as a standard app in the dock etc. It would be nice to have a status bar version.

Why can't Apple fix the hum if third-party apps can?
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intlplby
Veteran Member
 
Join Date: Dec 2004
 
2006-12-15, 09:31

mine scats like Cab Calloway
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