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Really annoying EMI!

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  • 28-04-2011 1:11am
    #1
    Trevor451
    Closed Accounts Posts: 1,463 ✭✭✭


    I seem to be getting some really bad EMI issues from my motherboards onboard audio. I think this problem might have something to with my graphics card since when I am on the title screen of minecraft the noise changes/ gets worse.

    I unplugged the audio cable from my computer and put it against the side of the IO sheild and I could hear the same sound. I also put it against the metal top of my case fan and I could hear the same noise.

    Motherboard is a Gigabyte GA-870A-UD3
    GFX: Club 3D 6850
    case is NZXT hades

    Any advice would be helpful :)

    Thanks


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    #2
    Solitaire
    Moderators, Technology & Internet Moderators Posts: 18,377 Mod ✭✭✭✭Solitaire


    Faulty mobo? That kind of BS happens all the time with VIA audio, but rare as hell with Realtek-based systems... :confused:

    Check to make sure the mobo standoffs are all in correct and the graphics card is inserted correctly, could be a grounding issue as it sounds like some contacts are touching that shouldn't be touching...


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    #3
    Trevor451
    Closed Accounts Posts: 1,463 ✭✭✭Trevor451


    Sounds to me like a grounding issue as well :p

    I had to remount the motherboard about a week ago because the case instructions were wrong and it seems that they missed out on a hole. The problem was occurring before this though. (see this pic. I have cleared up the cables a bit btw so it does not look that bad)

    I have no idea how the motherboard could be in contact with the rest of the case. There are washers between the screws and the motherboard :confused:


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    #4
    Monotype
    Registered Users Posts: 6,710 ✭✭✭Monotype


    157085.png

    Is the circled hole the one that you added a screw to? What about the other brass standoff? Make sure that you do not have any more than you need (especially not under the board). Use a screw for every hole with a metal-dotted rim so long as there's a corresponding hole in the case.

    Take out the washers. They're for the screw holes without the metal rims.


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    #5
    Trevor451
    Closed Accounts Posts: 1,463 ✭✭✭Trevor451


    Yeah when I was re installing the motherboard I put all of the stand-offs in the correct positions.

    Would getting another sound card be a solution? I think the case is not grounded properly since when I put my headset jack against any metal part of the case I can hear the exact same interference? :(

    One of my friends has the same case and power supply and he has no problems? :confused:


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    #6
    Trevor451
    Closed Accounts Posts: 1,463 ✭✭✭Trevor451


    Sorry to double post but I just tried out my headset on my logitech g510 keyboard (it has audio ports) and I can hear the exact same noise. I think that the keyboard has a built in audio processor so this must rule out the realteck HD audio?
    The headset needs USB power BTW so I had it connected to the front pannel USB port.


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    #7
    Solitaire
    Moderators, Technology & Internet Moderators Posts: 18,377 Mod ✭✭✭✭Solitaire


    Maybe a dodgy fan motor?


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    #8
    Trevor451
    Closed Accounts Posts: 1,463 ✭✭✭Trevor451


    Solitaire wrote: »
    Maybe a dodgy fan motor?

    Maybe but why would the EMI get worse/change while on the title screen of Minecraft? :confused:


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    #9
    Solitaire
    Moderators, Technology & Internet Moderators Posts: 18,377 Mod ✭✭✭✭Solitaire


    CPU/GPU fans speed up?


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