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Thread: Tried to make it better, ended up making it worse. no power from m2

  1. #1
    FLAC
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    Tried to make it better, ended up making it worse. no power from m2

    hopefully im just overlooking something.... but after trying for 2 hours to get power out of the m2 i just cant.

    the pc has been off for a few days while i made a new case. everything is done, installed, and now the m2 will not power up the mainboard.

    IT DOES send a continuity pulse on the j8 after 5 seconds of being powered. so, it IS turning on and trying to start the motherboard, but there is no voltage on the motherboard wires...

    even if i put the jumper into 'always on' there is no power at the motherboard connector. i dont even know what i could have done to make this happen... everything is still exactly the same as it was besides it all being in a case now, and i even took the m2 out of the case to test it. again, it sends the powerON pulse, but there is no power on the wires. the m2's fuse is OK... anything else im forgetting about?

  2. #2
    FLAC
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    Does a standard power supply work?
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  3. #3
    FLAC
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    it does. a standard atx power supply works fine, motherboard bootds.

    im not getting power out of the m2, even though i get the motherboard pulse out of it..... apparently this means my 1-month out of warranty m2 is dead. major bummer!

  4. #4
    FLAC
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    If a desktop supply works, check the ground on the power supply. It is possible that the power supply is reaching ground through the computer chassis or some wire going elsewhere from the computer and that ground may be enough to run the micro controller on the PSU, but not actually power the PC.
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  5. #5
    FLAC
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    nothing has changed since it was working though, it has been working fine for 6 months...

    ill test this on a battery inside, maybe it actually is a grounding problem but man, i cant imagine so.

  6. #6
    FLAC
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    You should first test it with a regular desktop supply. That way you can at least know for sure that the power supply is even the issue.
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  7. #7
    FLAC
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    yup, sure enough same results even when drawing power from a verified working 400w a/c power supply.

    i even get a POP spark when i touch the j1 to power, which means the m2 is drawing a load (ive always gotten that spark when you first touch the power to the m2. its the capacitors filling up...). also, my power supply kicks its second fan on when i put power to the m2, so again its indicating there is a load there. and like i said, the motherboard pulse is there, so the m2 is awake and aware, there simply is just NO power coming out of the motherboard connector itself.

    i have no idea what i could have done. i took good care, there is no reason this m2 should be broken. what a damn shame do the people at mini-box do repairs on these things? even if it takes awhile, i can buy a replacement now and wait for this one to be fixed... i fear the cost will be as much as a new one anyway though

  8. #8
    Fusion Brain Creator 2k1Toaster's Avatar
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    did you try switching the direction of the m2->mobo cable? The M2 works by grounding a pin. So it sinks, not sources.

    So if it is [red][black] flip one end so it is [black][red]
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  9. #9
    FLAC
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    yup, for sure. it was my first guess as it has tricked me before. there isnt any voltage on the m2 even after the motherboard pulse it makes. normally i could just power the motherboard on myself with a screwdriver but there is no power from the m2 anyway. i dont see anything physically wrong either, all the solder joints are strong and nothing looks cooked or weird... maybe if i just leave power hooked to it for awhile it will wake itself up all the way, i dont know. its not looking good.

  10. #10
    Fusion Brain Creator 2k1Toaster's Avatar
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    How does the fuse look? Is it broken? With power disconnected, check the fuse's resistance using a multimeter. If it is an open line, then it is blown and needs replacing. Alternatively you could just solder a jumper wire over the fuse and test, but that is risky and sort of stupid.
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