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Thread: Commell LS-372 + USDC20D shut down controller

  1. #1
    FLAC coucouillu's Avatar
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    Commell LS-372 + USDC20D shut down controller

    Hi ,

    i have got a problem with these stuff.

    the USDC20D shut down controller use "short to ground" when sending signal to the motherboard power button.

    But the LS-372 MB seems to need +5V signal on power button to power up.

    Any one else had experience?

  2. #2
    FLAC coucouillu's Avatar
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    I made all test.

    I am quite sure it is 5V powered up.

    When the motherboard is powered but off, first pin of the power button header is nothing (not grounded) and the second is +5V.

    If I short to ground the first pin, the second or both, nothing happened. But if I supply +5V to first pin, the motherboard wake up.

    My shut down controller do not short pin together, it shorts pins to ground. But ground, this is not +5V so the motherboard do not wake up.

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    _Dejan_'s Avatar
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    Did you fix your problem? How?
    Im buy LS-373 board and need one good power supply for it.
    Must have:
    low voltage threshold
    Normal work with S3 sleep

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    coucouillu> You need to create a small circuit with a transistor and a few resistors, to power the ls-372 from an mpegbox usc20d, here is the schematic : http://www.mpegbox.net/forums/viewto...dd525874fbeb4e

    I have the same combo of the ls-372 and usc20d running in my car, so it works fine with this little curcuit.
    Transflective Lilliput 8", LV-677DC Core Duo 1,83Ghz, , Mpegbox uSDC20D, Shuttle Express, HQCT, PG XS6600 http://carpc.boyakasha.dk

  5. #5
    FLAC coucouillu's Avatar
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    Quote Originally Posted by _Dejan_ View Post
    Did you fix your problem? How?
    Im buy LS-373 board and need one good power supply for it.
    Must have:
    low voltage threshold
    Normal work with S3 sleep
    I don't know LS-373 power up system but I can tell you that the LS-372 need +5V to the power button to boot up, or a power supply which shorts the 2 pins of the power button together.

    If you choose a power supply/shutdouwn controller which shorts to ground the power button like do the µSDC20, it won't work.

    I was obliged to modify it :

    Quote Originally Posted by Coucouillu
    I have found a solution.

    I was right. LS-372 needs a +5V signal to power up and the uSDC20 use a "short to ground" signal.

    So I modified the uSDC20 adding a little home-made circuit with 78L05 5V regulator a PNP transistor. I also modified routage and added a 4-PINS MOLEX connector in order to connect the USDC directly through the motherboard.






    Male MOLEX connector :


    Fixations and female MOLEX connector on motherboard :


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    FLAC coucouillu's Avatar
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    Quote Originally Posted by _dopehead_ View Post
    coucouillu> You need to create a small circuit with a transistor and a few resistors, to power the ls-372 from an mpegbox usc20d, here is the schematic : http://www.mpegbox.net/forums/viewto...dd525874fbeb4e

    I have the same combo of the ls-372 and usc20d running in my car, so it works fine with this little curcuit.
    This circuit looks easier than mine.

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    Ya, that one you did looks a bit bit much for this, the one i did is housed inside a piece of flexhose around the power switch cable going from the motherboard to the psu.
    Transflective Lilliput 8", LV-677DC Core Duo 1,83Ghz, , Mpegbox uSDC20D, Shuttle Express, HQCT, PG XS6600 http://carpc.boyakasha.dk

  8. #8
    FLAC coucouillu's Avatar
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    Quote Originally Posted by _dopehead_ View Post
    Ya, that one you did looks a bit bit much for this, the one i did is housed inside a piece of flexhose around the power switch cable going from the motherboard to the psu.
    Mine is integrated to the USDC.

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