Buzzing sound from the laptop!!!

Hi,

I got the dv6000t with T5600

I have a buzzing sound come out of it when it's plugged in,
and more loud when it's on battery

Anyone know what to do?

 

It is could just be the hard drive. Is it a continuous buzz or do you hear it start and stop?
Tim

 

It's continuous.
I don't think it's the hard drive cause it's on the left side and the sound is from the right side and center.

 

you have a grounding issue which is causing your speakers to buzz -- or such would be my guess. i had that happen before. got a new power adapter and put a new sound card in my laptop to fix it (the grounding issue destroyed my soundcard)

 

are you sure it's the speakers?
even when the sound is off the buzz is going on and no buzz on earphones and external speakers.

 

could be the CPU fan... has this on my macbook... still on the apple center waiting for parts (been 2 weeks+ already), is it high pitch buzz? like a bee? but it seems that it is continuous huh? ummm... yeah could be grounding issue also...

 

If it's a low loud buzz, try switching the laptop off while it's buzzing. If it slowly winds down then it's the cpu fan. I had a buzzy fan on my old Toshiba Portege.

If it's a high pitch and frequency buzz like a bee... see some of the other suggestions!

 

May be a cooling fan or OD. Turn it upside down to help isolate the sound, be able to provide more info in relation to exhaust vent ports No idea why on battery would be louder If an internal wire was being brushed by a fan, would think sound stay same.Describe noise better!

My brand new after market DVR-K06 was silent, but now on startup (~+2 months) w/ a CD inside, makes a noise before the drive spins up & begins reading optical media!

 

it's high pitch

is there a fan on the processor other than the one that turns on and off and you can hear it?

 

If you put the laptop under stress, such as playing a game, does the noise change, like getting louder? If so, its most likley a fan.

 

actually when the notebook is under heavy work the noise is almost not heard

 

The problem is one which is reasonably well known to MacBook users. It affects a Dell 6400 I have, and I think I would go insane if I ever actually used the laptop.

The noise is caused by the CPU switching between power states. That is why it is not apparent when you are putting the laptop under load - the CPU is not dropping down into the lower power states. The only solution that I know to work is to get RMClock and enable the option 'Run HLT command when OS is idle'. That solution works because it forces the CPU to go no lower than the C1 power state. The same effect can alternatively be achieved by disabling USB power management or plugging in a USB device.

The caveat of forcing that option is that the battery life will decline significantly. Other solutions have been proposed which avoid reducing battery life (see the third link, for example) but they did not fix the problem for me.

http://www.engadget.com/2006/03/14/whining-macbook-pro-youre-not-alone/
http://www.engadget.com/2006/07/08/apple-sneaks-new-logic-board-into-whining-macbook-pros/
http://forum.tabletpcreview.com/showthread.php?t=2674
http://forum.tabletpcreview.com/showthread.php?p=31347
http://www.red-sweater.com/blog/105/all-work-and-no-play-makes-a-quiet-macbook-pro

 

It could be either your CPU's power regulator or a capacitor(s). Try using RM Clock or NHC and undervolt your CPU (lower it's speed) while on battery. That should help eliminate the noise while on battery if it's what I'm thinking it is.

However, since you seem to be hearing it while on A/C power as well, it may be something else.

 

Thanks guys,
I think it is the CPU, d**n Intel and I even work there (not in the processors)
I reduced the noise to minimum with RMClock.

 

Try the solution in the fourth link. If it works for you, you should be able to avoid the reduction in battery life as well.

I really hope that when my W2P arrives it does not have the same problem

 

I tried it and it pretty much done the job
Thanks man