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Humming & buzzing in monitor speakers from graphics card

post #1 of 5
1/20/12 at 1:52am
Thread Starter 

 

I just bought this PC  from ebay. It originally came from IBuyPower 2 months ago. 
 
The PC has Asus-P8Z68-V motherboard (not Pro)
 
It has a EVGA superclocked Nvidia GFX 560 Ti and I have a Sharp Aquos LC32D41U 32 HDTV. The LC32D41U only supports PC through its DVI connector (for some reason they don't let PCs use HDMI in 1:1 ratio mode for 1360x768). 
 
I was already aware of  that the HDTV couldn't do PC through HDMI has this setup worked fine with my old dell.
 
I hooked up the DVI cable to one of the two DVI females on the graphics card. I have an audio cable connecting my DVI audio from my HDTV to the green colored (line-out/headphone) motherboard audio jack in the back. No other color works but green. 
 
When in 3D mode it gives the monitor's speaker a certain humm or buzz depending on the graphics intensity going from a high pitch squeal (light intensity reaching 3900 FPS) to a low humm (high intensity DX10 reaching 50 FPS). 
 
When not using a 3D application there seems to be super faint noticeable high pitch buzz, that is only heard when the TV volume is really high. 
 
 
Update:
 
Suspecting a ground loop but then tried....
 
My monitor is actually a HDTV and it has a 2 prong power cord anyways but I still plugged it into a completely different socket and the sound persisted. I then attempted to make a shield from alumnium foil and I could not get the sound to stop. Finally I played around with the wires and still the sound. Now I have the EVGA connected to my HDTV using DVI and I have a DIV audio cable from my HDTV to the line-out on the motherboard. You would think disconnecting the DVI would leave the sound but get rid of the picture but the humming stops when I disconnect the DVI. This leads me to believe the card is somehow trying to giving the DVI cable interference down the line. It's a expensive heavy &  thick cable DVI cable with a male single link DVI-D end. 
  
What is going on here? 
 
Here is a person with the same CPU ,GPU and motherboard as me having the same issue: http://www.evga.com/forums/tm.aspx?high=&m=1216213&mpage=1#1420828
 
 
 
Update 2:
 
Decided to focus on drivers.
 
Installed the lastest onboard sound driver, retarted..same problems. Decided to reinstall the newest nvidia drivers, same problem. Decided to uninstall everything nvidia, restart, and now I can't run anything 3d to test (haha) as its generic driver. Reinstalled just the display drivers, not the audio....same problems.. Then I disabled all each audio device in device manager one by one and test, even with all audio devices disabled the sound persisted.  Keep in mind this sound comes through even when I have the windows (software) volumne muted.
 
I am out of ideas driver wise.
 
 
Update 3:
 
I found another male to male 3.5 mm stereo jack and tried it, the sound still remains. Because the sound doesn't exist without the 3.5 mm jack by itself nor does it exist with the DVI by itself I am thinking this is more and more a ground loop issue. I might pickup a ground loop isolator later on...
 
I also found another thread:
 
 
and many many more, most all of them dealt with this problem using the different versions of asus-p8z68.
 
Many people suggest a PCI sound card but that solution seems to only fix it 50/50. The ground loop isolation seems to have better success ratio.
 
What do you guys think?
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post #2 of 5
1/20/12 at 2:23am

i have a Echo Audiofire 2 and 2 KRK Rokit 5 2nd gen speakers.

 

i spent the first month of having the speakers banging my head against the wall for the same reason you are now.

 

And then i noticed something. suddenly the noise was only coming from 1 of the 2 speakers... i checked what was different and then it hit me.

 

i have two power cords with 2 power strips. and the speaker that was giving out the static was connected to the same power strip i had my monitor and computer PSU hooked in to.

 

The PSU and the monitor were providing feedback in to the power strip. and since the PC consumes more power when in 3D mode. i suspect theres an increment in feedback from the PSU.

 

Seperate the power for the  speakers and DAC to a seperate plug and power strip.

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post #3 of 5
1/20/12 at 2:27am
Thread Starter 
Quote:
Originally Posted by Aevum View Post

i have a Echo Audiofire 2 and 2 KRK Rokit 5 2nd gen speakers.

 

i spent the first month of having the speakers banging my head against the wall for the same reason you are now.

 

And then i noticed something. suddenly the noise was only coming from 1 of the 2 speakers... i checked what was different and then it hit me.

 

i have two power cords with 2 power strips. and the speaker that was giving out the static was connected to the same power strip i had my monitor and computer PSU hooked in to.

 

The PSU and the monitor were providing feedback in to the power strip. and since the PC consumes more power when in 3D mode. i suspect theres an increment in feedback from the PSU.

 

Seperate the power for the  speakers and DAC to a seperate plug and power strip.



I had already tried this out in update 1. The speakers are the built in HDTV ones. I originally had them on the same power strip, but then plugged the monitor (essentially the speakers as well) directly to the power outlet to the right of my computer, as the computer was connected to the powerstrip in the outlet left of the computer. Completely different outlets and still the noise.


Edited by ParoXsitiC - 1/20/12 at 2:29am
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post #4 of 5
1/23/12 at 8:45am
Thread Starter 

How can I check for a group loop using a multimeter? I have never used one before but I got one and would like to test for this

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post #5 of 5
1/23/12 at 4:45pm
Thread Starter 

 

OK I got some external speakers and hooked it up to the line-out of the computer and I don't hear the audio coming through the external speakers. I then hooked up my laptop to the monitor and got no pickup of any sounds. So I think this confirms its not a ground loop, nor is it defective speakers in the monitor. Somehow the 3.5 mm combo with the DVI is causing it to pickup nearby sounds. I got my ear close to the PSU/GPU area and I could tell a very faint squeal coming from them that is the same sound on the monitor. Just to note, I don't have a microphone hooked up at all.
 
I am a little baffled as to the problem at this point.
 
Here is a YouTube video demonstrating the sound:  http://www.youtube.com/watch?v=KfgevNK9JuU
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