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Thread: H67M-ITX / DC power supply incompatibility

  1. #1
    Join Date
    May 2012
    New Hampshire

    Default H67M-ITX / DC power supply incompatibility

    If ASRock support still monitors these forums, I have an interesting problem I've isolated with four different H67M-ITX motherboards.

    I've had four people, including myself, report an incompatibility between a specific 120W 12V DC internal power supply board and the ASRock H67M-ITX. All four H67M-ITX were able to be powered with a different PSU and all 4 DC power boards were able to power other motherboards, including the ASRock Z68 ITX motherboard. I've been putting together PCs for a long time and I've never run into such a specific motherboard / power supply incompatibility.

    The symptom is that the motherboard stays on for about 1 second and then powers right back off. Using a different DC power board, same rating (12V 120W) and it works no problem. The same power board has no problem with several other ITX motherboards, including as I said before the ASRock Z68 ITX motherboard. CPU doesn't seem to matter -- it's reproducible with i3-2100, i3-2105, G620 and G530.

    I'd be willing to supply ASRock with the DC power supply for testing if interested. The manufacturer of the power supply is willing to test but they cannot get a ASRock H67M-ITX where they are located.
    Last edited by Dougie Fresh; 05-09-2012 at 01:21 PM.

  2. #2
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
    Join Date
    Dec 2008
    Tacoma, WA. [USA]

    Thumbs up Re: H67M-ITX / DC power supply incompatibility

    Send a Private Message to ASRock TSD - Emily and include a link to this thread.
    You can also fill out an online tech support form at ASRock > Support Request Form.

    A similar problem happened with one of the major quality psu manufacturers several years ago with an incompatibility with some (Gigabyte?) X58 motherboards. Once the problem was confirmed, a fix was make to the psu and there were no further issues.

    It might save owners some grief if you state the power supply's brand and model number, where you say that "there appears to be an incompatibility with the nnnnn model made by xxxxxx."

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  3. #3
    Join Date
    Jan 2013

    Default Re: H67M-ITX / DC power supply incompatibility

    The power supply and motherboards often have issues; I have faced this problem three times. It is strange but some power supplies donít have enough measure to stop the noise voltage signal from coming through the output as well which renders it useless with relatively more sensitive motherboards.

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