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Thread: Quiet "crackling" sound coming from PSU, even when it is switched off.

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    Default Quiet "crackling" sound coming from PSU, even when it is switched off.

    PSU: Cooler Master V550 Semi-Modular. I'm told that this is a decently high quality PSU.

    So yesterday when I was moving all my computer gear around, I noticed that there was a small crackling sound coming from my PSU. It wasn't very loud, mind you (I had to put my head up to my case in order to hear it), but the scary bit was that the sound persisted even after the PSU switch toggle was turned off, and would not stop until I physically pulled out the PSU plug.

    If this was due to coil whine then I wouldn't bother going through the process of returning this PSU and buying a new one. But what concerns me is that the sound continues even after the PSU is switched off. Doesn't the PSU switch physically sever the connection between the PSU and the power cable, or something?

    The sound exists when my computer is plugged into another power socket in my house too.


    EDIT:
    To be clear, the build itself is only a few weeks old
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    Last edited by 80espiay; 06-24-2017 at 09:22 PM.

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    A few quick questions;

    Is the powersupply used, or being re-used from another build?
    Are you switching the power supply off at the back of the unit?

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    Quote Originally Posted by Tator Tot View Post
    A few quick questions;

    Is the powersupply used, or being re-used from another build?
    Are you switching the power supply off at the back of the unit?
    Hey thanks for getting back to me. I very much appreciate it

    The Power Supply was bought brand new.

    Yes, I am switching the power supply off using the toggle on the PSU itself, located on the back of the unit. The sound persists.

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    Sometimes it helps to flip the AC plug, so that live and neutral is switched. But that's not possible with the AC plug that you use in New Zealand right?

    You're using the Australian wall outlet right?



    Here in The Netherlands we use the Schuko German Style, which can be plugged in 180 degrees for changing the neutral and live wire.
    Last edited by -The_Mask-; 06-25-2017 at 05:13 AM.

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    Quote Originally Posted by -The_Mask- View Post
    Sometimes it helps to flip the AC plug, so that live and neutral is switcht. But that's not possible with the AC plug that you use in New Zealand right?

    You're using the Australian wall outlet right?

    Yup, I live in New Zealand and we share the same plug as Australia.

    I just met a friend who told me that the issue could be with the wiring in my house. In fact, my friend said that his house "had no neutral" or something like that. Is that the sort of thing you had in mind?

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    No, because without a neutral you don't have a working circuit. You need to have a live and neutral wire to have a working circuit. Don't you mean, missing earth, that could also be the reason for the problem.

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    If that were the case, would it be something for me to worry about with regards to my computer?

    Else, as long as the sound is only audible if my ear is right up against it, do you think I should be worried about it?

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    Does the toggle on the back of the PSU interrupt the power? What happens if you literally pull the plug? I am thinking that some switches do not stop power from going to an electrical device, but only stop its functioning -- turn it off without killing the power.
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    I'm sorry, I'm not entirely sure how I would test that.

    Physically pulling the plug stops the noise, as expected.

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    So uhh, is there something I can do to test how serious the issue is?

    I left a post on facebook asking my friends if they'd let me plug my computer into their house power sockets, so there's that.

    EDIT: this is a video that seems similar to what I'm experiencing - https://www.youtube.com/watch?v=7W_RKjZ3fx8
    Last edited by 80espiay; 06-26-2017 at 06:06 AM.

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