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Top Student
Posts: 6
Member Since: ‎06-08-2010
Message 1 of 3 (1,101 Views)

Digital(computer) noise on headphone output jacks

Hi

I have a dv9000 which has a problem with  digital(computer) noise on headphone output jacks. I hooked  it up to my car

stereo axillary input jack and noticed a lot of static noise, even with laptop sound muted. Only time there is no static, or very minimal  is when I put the laptop in hibernation mode. So I'm pretty sure it's a digital form of noise.

I have a HP DV5T also and it does not have this problem. So is this a common and accepted problem with all older dv9000 series laptops?  Or is there a problem with my dv9000? and if so, what do you think it might be.  I've looked at the dv9000 headphone output on the Oscope and I did indeed see square waveforms mixed in with other random noise.

FYI---When head phone is used, there seems to no noise or is very faint. Do headphones have inherent ability to filter out the digital form of static?

Thanks

Tom

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Distinguished Professor
Posts: 2,817
Member Since: ‎11-21-2008
Message 2 of 3 (1,078 Views)

Re: Digital(computer) noise on headphone output jacks

Interisting info, I never tested the digital output.

Have you tried updating the driver?

______

Pavilion DV2922TX, XP-SP3 32bit, Intel T5750 2.0Ghz, Nvidia Geforce 8400M GS with 128MB, 4GB 667 DDR2, 250GB HDD
Honor Student
Posts: 2
Member Since: ‎07-26-2011
Message 3 of 3 (643 Views)

Re: Digital(computer) noise on headphone output jacks

i just bought a 4520s pro-book and i'm having the same problem but i DO hear the noise with my headphones. when i plug in my headphones i can hear every time the HD spins or a window opens or closes, and the cd drive is unbearable. this is driving me nuts because i bought this notebook for my music production so i sometimes spend hours with headphones in. i have contacted support with no success. anybody have any ideas?

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