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Thread: Powering DSATX with atx power supply problems

  1. #1
    m0f
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    Powering DSATX with atx power supply problems

    Hi. I just for the first time fired up my carpc on the bench last night. Everything seemed to startup and run for an indefinate time in the cmos setup. I inserted the windows cd and booted into setup. Everytime it boots up to where it would normally prompt you to hit enter and shuts down completely.

    Powering the DSATX is a Macron 350w supply with all the yellow 12+ wires together and the black ground wires togher. The grey is wired to ground as well so the supply is hardwired on.

    When the pc shuts off, the house PS fan also shuts off which leads me to believe it's going into some sort of fault protection, so that indicates it's not the dsatx but the house ps causing this issue ? It's strange as it's supposed to be able to produce 20A to the 12v rail.

    Another thing to note, if I unplug the hard drive it boots into the windows setup fine. Also also with a house PS hooked up directly it works perfectly.

    Just looking for someone more experienced to confirm my suspicions before hooking it up to a car battery.

    Thanks

    EDIT : Just wanted to add that it's a 51w athlon 64 3000+ 754, 512MB, 1 Samsung sata hard drive and 1 dvdrom. So it shouldn't be too much of a power hog.

  2. #2
    FLAC
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    Quote Originally Posted by m0f
    Hi. I just for the first time fired up my carpc on the bench last night. Everything seemed to startup and run for an indefinate time in the cmos setup. I inserted the windows cd and booted into setup. Everytime it boots up to where it would normally prompt you to hit enter and shuts down completely.

    Powering the DSATX is a Macron 350w supply with all the yellow 12+ wires together and the black ground wires togher. The grey is wired to ground as well so the supply is hardwired on.

    When the pc shuts off, the house PS fan also shuts off which leads me to believe it's going into some sort of fault protection, so that indicates it's not the dsatx but the house ps causing this issue ? It's strange as it's supposed to be able to produce 20A to the 12v rail.

    Another thing to note, if I unplug the hard drive it boots into the windows setup fine. Also also with a house PS hooked up directly it works perfectly.

    Just looking for someone more experienced to confirm my suspicions before hooking it up to a car battery.

    Thanks

    EDIT : Just wanted to add that it's a 51w athlon 64 3000+ 754, 512MB, 1 Samsung sata hard drive and 1 dvdrom. So it shouldn't be too much of a power hog.

    A. The Gray wire is the wrong wire to ground, you should be grounding the green wire.
    B. Are you meeting the minimum load requirements on the Power supply? Is the output Current 2-30 amps on the 5 volts, or is it 0-30 amps?
    C. Is the DSATX Flashing it's LED at you?
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  3. #3
    m0f
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    Thanks for the reply.

    I double checked the wiring again. There is no green wire on this supply, but I check the pinout at http://xtronics.com/reference/atx_pinout.htm and it I'm pretty sure it's the correct one. 4th from the left top row when pictured like in the above url.

    I am looking at the diagram head on as if the wires are entering through the back of the diagram, which is the way everything else appeared to line up best. If this is not correct please let me know.

    Good point about the minimum load. Unfortunately it does not specify, only the max.

    The led on the dsatx is solid one while the computer is running. When it shuts off, the led immediately goes black, as well as the fan on the ac/dc power supply shuts off completely.

  4. #4
    FLAC
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    One thing you can try is to plug some old hard drives into the AC-DC power supply to give it a minimum load.
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  5. #5
    lez
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    Most psu need a load on the 5v rail or they shut down / go into a fault mode.
    Lez, more widely known as flez1966

  6. #6
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    You can get the ac-dc power supply to turn on / stay on by shorting the green wire (pin 14) with a black (pin 15) using like speaker wire or something. Then it will turn on/off using the switch at the back of the unit, without plugging any other hardware into it.

  7. #7
    Neither darque nor pervert DarquePervert's Avatar
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    I made a pair of cables to make hooking my DSATX up to a spare power supply inside.

    The first uses a 3-pin fan header and a bit of solder. I looped a wire around so it shorts the outer two pins of the fan header, which fit neatly into the ATX plug for pins 14 & 15. I may wire a switch to this adapter, so I can have a convenient button to press to turn the PSU on/off when I'm testing.

    The second uses a HDD cable with a 3-pin fan header off it (I had about a half-dozen of these that came with some case fans). I cut the 12v & ground wires, as well as one end of the fan header.
    The 12v, Gnd & fan header then go into the three pins of my quick disconnect (representing _12v, Gnd & ACC). There's a switch attached to the fan header that maintains an on/off state, so I can simulate turning the ignition on/off to test DSATX shutdown functionality.

    There are pics of them in my worklog, but they aren't very clear, I don't think.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  8. #8
    MySQL Error MatrixPC's Avatar
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    Some/most AC PSU need load to work like other has said.
    The pin you shorted is Pin 14 and 15. Color code is not really standard, but you did correctly (grey on yours but green on others).
    If you just want to bench test hardware and software, why not plug the CD/DVD ROM to the AC PSU? But better off just use an old HD/DVD drive to give load to the AC PSU so you know that the DSATX can power all your hardware.
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