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Thread: I got a tough one. Electrical Guys Look

  1. #1
    Jesus Freak antimatter's Avatar
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    I got a tough one. Electrical Guys Look

    Hey guys, I gotta tough one here. My computer has started crashing latly. I haven't noticed a pattern besides it happened when i put a ground wire from a screw on the via motherboard to a screw on the Opus Power supply.

    Now what happens is that when i start the car/computer it will turn on for a couple minutes. Then all of the sudden my screen goes blank with all sorts of garbled colors (mainly purple) and lines (looks like when the monitor is out of synch)

    The fan is still running on the motherboard but the music stops playing.

    Sometimes it would just reboot after a couple minutes. Either way as soon as i disconnected that one wire i havent had any problems. So i am curious about the relation of this ground wire to the motherboard and psu. Currently my motherboard is not grounded to the PSU (which is not causing any advers side effects) But i would like an experts opinion


    Thanks
    -Jesus- King of Kings Lord of Lords

  2. #2
    It ain't easy being a green moderator meddler's Avatar
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    You could have caused a floating ground between the PSU and motherboard and the board doesn't like it. Just a guess.
    Never let the truth get in the way of a good story

  3. #3
    Jesus Freak antimatter's Avatar
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    How do i fix this, what is a floating ground, care to elaborate?
    -Jesus- King of Kings Lord of Lords

  4. #4
    Maximum Bitrate TimmyM's Avatar
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    Could the ground wire on the MB be touching something else on the MB, possibly causing a short?

  5. #5
    Jesus Freak antimatter's Avatar
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    No, it is heatshrinked and sheathed.

    I think meddler is on the right track here... i just have no idea what it is or how to fix it
    -Jesus- King of Kings Lord of Lords

  6. #6
    Maximum Bitrate mushin's Avatar
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    Why do you need this ground wire? The MB is already grounded though the PSU via the ATX power connector. Since it was working fine before you added it... I don't see the purpose

  7. #7
    Variable Bitrate
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    Maybe fried something ?
    Looks like bad memory on VGA-card to me ?

    Edit :
    Sorry, didn't read the last paragraph very well. Forget about my questions.
    Looks like Meddler is right as you mentioned already. It is hard to track down such things, but beware of floating grounds as they may screw up your components.

  8. #8
    It ain't easy being a green moderator meddler's Avatar
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    I thought that it could have been a bad card or ram until I read Antimatter's last statement as well.
    A floting ground is where the potential of a certain point (read voltage) is suppose to be earth (or 0V) but for some reason it is not quite 0V, ie it floats. It's having a small differetial between one point that is supposed to be grounded and ground. It can cause all types of problems. It ususally shows up as noise coming through your speakers and hence people talk about single point grounding.
    I'd say that this floating ground is for some reason upsetting the motherboard as the differential changes up and down.
    Think of it like this. The motherboard is grounded through the ATX power connector and you are trying to ground the case of the PSU to the motherboard as well. The may be a differential between the case of the PSU and the power supply inside the case. Think of them trying to fight each other and the mother board is not happy and shutting down.
    As long as you are not gettting any other side effects, then leave it disconnected.
    Never let the truth get in the way of a good story

  9. #9
    MySQL Error jcdillin's Avatar
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    might be floating because a car does not have an earth ground like a normal PC case is grounded to.
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  10. #10
    Variable Bitrate choyak's Avatar
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    Sorry, but to me 'floating ground' implies that a connection that is supposed to be grounded is not grounded. This can cause all sorts of dangerous conditions, but that is not what is happening here. It seems that the OUTPUT of the Opus is what the mobo 'ground' or preferably called 'LVCOM' (low voltage common) is connected to, which is different than 'ground' which is the car chassis, and that is not really 'ground' either, the only real 'ground' is the good old earth!! But as for the wire, if it is functioning properly without it, don't install it
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