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Cosmos II Front Panel Audio Noise - FIX.

post #1 of 6
Thread Starter 
So, this very well may have been discovered before. Either way, it's an easy fix I thought I'd share. This COMPLETELY eliminated the issue for me. Which is awesome, as I thought it was just general interference due to my EMI-Shieldless soundcard being right above my backplate-less GTX680:P However, upon plugging my Sennheiser PC360s into the soundcard itself at the back of my PC, I was surprised to hear zero noise...thus...investigation began.

So, basically, it's because the ground wire between the audio jacks and the usb ports beside it runs along all of them. Meaning they share it, thus, anything that can provide POWER will provide interference to the sound via that wire (which isn't really necessary for audio). All you have to do is disassemble the top panel and separate them. I'll cover the separation here, but I won't insult your intelligence and cover the disassembly:P

Short disclaimer: I am not responsible if you mess up your case in any way. It worked for me, that's all I can say. Also, the pictures provided are from the OTHER front module I have (got the replacement from Cooler Master due to the faulty fan controller some including myself have gotten).

Anywho...Once you disassemble the top module, you'll see the fan controller inside (a green PCB, or a black one if you have the updated one). You'll also see this:
(It'll look just like this, in this orientation, but obviously secured into the top panel)


Now, the bottom one as shown here contains a USB 3 port, 2 USB 2 ports, and the front panel audio:


The ground wire, the culprit in this debacle, runs about here throughout the rubber-ish casing (as illustrated by the red line):


That is the ONLY wire that runs through there horizontally, so what you want to do is simply cut the rubbery brick between the audio jacks and the 3 usb jacks in the area illustrated in red here:


What you'll want to do is leave a fair but of space between the now separated pieces by trimming it down as much as possible without actually getting too too close to the usb/audio jacks themselves, and maybe wrap the audio piece in some electrical tape just to be safe (as I did).

A messy guide, I know, but I hope this helps:) A lot of cases have this issue from what I hear.
Biggus D.
(18 items)
 
Leo Laporte
(13 items)
 
Shooter McGavin
(24 items)
 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 Thuban 1090T @ 4GHz Asus Crosshair IV Formula 2x5870 in CrossfireX 2x4GB OCZ GOLD 1333MHz 
Hard DriveOptical DriveOSMonitor
2x1TB Samsung Spinpoint, 2x1TB Seagate Barracuda Samsung Super Multi + Samsung BluRay LS Windows 7 Ultimate x64 2 x Samsung 2494SW 24'' 16:9 1080p 
KeyboardPowerCaseMouse
Razer Arctosa Silver Silverstone Strider ST-1000 Coolermaster HAF X Steelseries Kinzu 
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Steelseries 11.5x12.2 Surface 
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Biggus D.
(18 items)
 
Leo Laporte
(13 items)
 
Shooter McGavin
(24 items)
 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 Thuban 1090T @ 4GHz Asus Crosshair IV Formula 2x5870 in CrossfireX 2x4GB OCZ GOLD 1333MHz 
Hard DriveOptical DriveOSMonitor
2x1TB Samsung Spinpoint, 2x1TB Seagate Barracuda Samsung Super Multi + Samsung BluRay LS Windows 7 Ultimate x64 2 x Samsung 2494SW 24'' 16:9 1080p 
KeyboardPowerCaseMouse
Razer Arctosa Silver Silverstone Strider ST-1000 Coolermaster HAF X Steelseries Kinzu 
Mouse Pad
Steelseries 11.5x12.2 Surface 
  hide details  
Reply
post #2 of 6
i need help with this same problem i dont know what should i cut :,(
post #3 of 6
are you there raven dizzle
post #4 of 6
Awesome thread! I have also just solved the same issue on my Cosmos ii case!

Driving my Sennheiser HD650's on a noise free output!

The only thing I did slightly different - On picture 4, I didn't cut the whole connector in to two pieces because I believe this might have caused mounting issues when re-assembling. I just simply cut out the bottom square using a sharp knife, and about halfway into the block you will see some clear plastic inside, and the brown grounding wire.


Correct me if im wrong on the mounting tho smile.gif

Thanks

Mike
post #5 of 6
Hello,

I have also developed a static noise on my front panel headphone jack. I am still trying to root this down to Front panel/onboard sound.

Did you get noise only when one of the USB ports was in use or did you experience noise at all times? Additionally, did you experience the noise from the first instance you used the port or did it creep in over time?

Did you get any pictures of the completed modification? (would be helpful for me to use as a reference) Thanks for your time and the post, very informative!

Regards,
post #6 of 6
{Sorry, doubled post}
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