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Thread: another ground noise issue..sorry :( searched a few threads..

  1. #1
    Low Bitrate Nav2k's Avatar
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    another ground noise issue..sorry :( searched a few threads..

    Hi guys,

    Sorry to make yet another thread but if anyone can just give me some tips i'd appreciate.

    I've spent a little while searching on the forums and have done some debugging as suggested.

    ive also been reading this article a bit..
    http://www.epanorama.net/documents/groundloop/

    Firstly i have this PC so it's in it's own case etc.
    http://cgi.ebay.com.au/Intel-1-2Ghz-...1%7C240%3A1318

    I have my battery in the boot grounded to a sanded down point in the spare tyre well. Ive got my amps going to that ground via a distribution block.

    The ground wire of the PC is attached directly to the distribution block.
    ive tested with my ipod (connected to amps) and music plays fine without any noise so my amps are grounded correctly ?

    As soon as i connect the PC thats where the problems occur.
    I've bought a stinger GLI off the mp3car store.
    it sits inbetween my computer and the amps. it also has 2 optional grounding wires on each side which ive connected to that distribution block.

    admittedly im using some cheaper rca's but they work fine for the ipod...so im thinking its something with the PC. What are my next steps to try?
    also have a laptop that ive tried like the ipod and that works fine too.

    any help is really appreciated...

  2. #2
    Fusion Brain Creator 2k1Toaster's Avatar
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    Is your PC's chassis grounded?
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  3. #3
    Low Bitrate Nav2k's Avatar
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    i dont think so?
    it sits on a bit of MDF. The only ground is the ground from the power supply.
    should i be running a peice of wire from the metal case of the PC onto the ground (my distro block)?
    or should i be opening up the PC to check if theres a wire from the metal case to the ground wire of the power supply?

  4. #4
    Low Bitrate Nav2k's Avatar
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    anyone?

  5. #5
    FLAC WuNgUn's Avatar
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    If your battery is in the 'boot' (trunk), and I assume your PC is as well, why didn't you connect the PC ground straight to the negative battery terminal???

    Also, is this the only battery in the car, or do you have one up front as well?

    I hope you have at least a 4 AWG wire on the battery ground.

    I would also run a ground strap from the PSU's negative terminal to the mainboard chassis and from there to the chassis of the car...
    Make sure the rear ATX plate is grounded as well too...

  6. #6
    Low Bitrate Nav2k's Avatar
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    WuNgUn, thanks for ur response.

    Yup PC is in the 'trunk' (sorry hehe), and theres no other battery up the front. I originally ran the ground straight to the battery but thought it was causing these noises as everything should be grounded to the same place. (infact that ground goes to the same point anyway). The noise was still apparent.

    I do have 4Gauge wire going from the battery straight to the ground point in the tyre well. i also have my 'ground' distribution block connected to that same point with smaller 8Ga runs going to the amps (0.5m lenght runs so im sure that's alright..also have 8Ga power..).

    I'll try the ground strap idea...that's just running a wire from the neg of PSU and solder it onto the inside of the case right? Then a wire from the inside of case to my common ground?

    I'll give that a shot and let you know what happens. cheers

  7. #7
    FLAC WuNgUn's Avatar
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    You don't even need to solder the wire...just some small gauge stuff to make sure the ground isn't taking a different route to 'earth'...
    Have you tried seperating the PSU power lead off the amp distro block as well? Running them straight to the battery by themself (both power and ground) will keep the PSU happier...
    Also, your touch screen...try unplugging the VGA and see if that doesn't kill the noise. Most people recommend powering the VGA off the same PSU as well, for interference reasons...

  8. #8
    Low Bitrate Nav2k's Avatar
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    Thanks again,
    I've tried the ground strapping idea but nothing changed =/

    I'll give the touch screen idea a go...i can see the touch screen is going all wobbly etc (looks like interference when a mobile rings near it).

    ive tried the psu on a different power lead (ie. straight to battery and still same).

    Will give the screen idea a go.

  9. #9
    FLAC WuNgUn's Avatar
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    Are you running a M2 or M4 PSU? I had the same display anomalies in my screen when I tried running an M4...also didn't have anything but static coming out of the sound cards!

  10. #10
    Low Bitrate Nav2k's Avatar
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    actually im running the M2 but exact same problem yes! i was forced to buy a stupid USB sound card (cheapo) just to get my system up and running because i got sick of debugging the sound issue.

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