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Thread: Yet Another M1-ATX problem, please help

  1. #1
    Low Bitrate Erorus's Avatar
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    Unhappy Yet Another M1-ATX problem, please help

    Here's the timeline:

    March 21, 2005 - ordered M1-ATX 90w from mp3car.com
    July 10, 2005 - finally got around to installing the power supply
    August 4, 2005 - installed new battery in car, since the old one was on its way out
    Works great untilll..
    August 7, 2005 - Went on a short 15-min drive, power supply worked fine as always. As I get back in the car to go home, I turn it on, and the PSU doesn't kick over. Virtually nothing happens.

    After further examination, I find that it's getting stuck on the power draw of the fans, or something on the 12v rail. I connect only the motherboard and the cpu fan to the power supply, turn it on, and the fan gives little "click.. click.."s as it tries to turn over. Volts on the 12v stay around 0 until it tries to push the fan, then it measures ~2v and quickly drops back to zero. It'll nudge just a tiny bit and nothin'. After a few clicks, out of frustration I spun the fan with my fingers, and the damn thing booted up! 12v steady, and the 5v line is steady at 5v.

    Turn it off, wait, turn it on, same story.. fan barely budges, no voltage on the rails, but as soon as I spin the fan, everything lights up. It's not just that fan, either.. I try to run it with a different fan, or just the hard drive, and they "click" to start but never get going.

    Anyone experience this before? What's the deal?

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    Maximum Bitrate pRoFiT's Avatar
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    Do you have a 12volt regulator before the power supply? The system im working on will run with the car off but will shutdown seconds after I start my car. I'm going to add a 12Volt regulator and see if that fixes it. My fan also would spin for a sec when turning on and then do nothing.
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  3. #3
    Low Bitrate Erorus's Avatar
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    No, the PSU is connected more-or-less directly to the car, just a switch in the way, actually. The voltage from the car in accessory was 12.5v steady. The PSU is advertise to handle car voltages, which is why I bought the damn thing, so I find it silly to put a regulator in-line with it. Thx for the suggestion tho.. I'll try it out on a more stable 12v source I have (a few large standalone batteries, not automotive) and see if that helps.

  4. #4
    VENDOR - ITuner/MiniBox
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    Check your wiring to the M1-ATX, you must have strong connections, no switches, etc. You need to handle high in-rush currents at startup.


    M1-ATX will work as low as 6V, so that's not a problem.

    What type M/B are you using?

    -Andrei


    Quote Originally Posted by Erorus
    No, the PSU is connected more-or-less directly to the car, just a switch in the way, actually. The voltage from the car in accessory was 12.5v steady. The PSU is advertise to handle car voltages, which is why I bought the damn thing, so I find it silly to put a regulator in-line with it. Thx for the suggestion tho.. I'll try it out on a more stable 12v source I have (a few large standalone batteries, not automotive) and see if that helps.

  5. #5
    Low Bitrate Erorus's Avatar
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    The wiring is solid: the cord between the accessory outlet and the PSU is a standard 110v AC computer power cable. Overkill, actually. I know the outlet is good for that amt of output b/c I used to run the PC through an inverter and an AC-DC PSU.

    The motherboard is nothing special: an Epox EP-3VWB+. It's socket 370 and I'm running a Via C3 on it.

  6. #6
    Newbie etown's Avatar
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    Quote Originally Posted by Erorus
    The wiring is solid:
    Quote Originally Posted by Erorus
    No, the PSU is connected more-or-less directly to the car, just a switch in the way, actually.
    Um, switch? solid? So the switch connects to a relay right? and not directly inline with the circuit path?

    Have you checked the computer with another powersupply?

  7. #7
    MySQL Error MatrixPC's Avatar
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    Did you try to replace the fan?
    Sound like the fan is stuck/seize(sp?)
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    Quote Originally Posted by pRoFiT
    Do you have a 12volt regulator before the power supply? The system im working on will run with the car off but will shutdown seconds after I start my car. I'm going to add a 12Volt regulator and see if that fixes it. My fan also would spin for a sec when turning on and then do nothing.
    M1-ATX includes regulation.

    BTW, why do you think adding a regulator will help this situation? Are you thinking that after starting the car the voltage is too high and th computer shuts down? Or do you mean that you are running the computer with the car off, then you start the car and the computer dies (i.e. it doesn't survive crank)?
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    Low Bitrate Erorus's Avatar
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    Quote Originally Posted by etown
    Um, switch? solid? So the switch connects to a relay right? and not directly inline with the circuit path?

    Have you checked the computer with another powersupply?
    In a stunning display of overkill, the switch is a standard 110v AC household switch in a standard household switchbox, and switches the power where the M1-ATX would normally expect the accessory (switched) input. The always-on power lead is straight through from the accessory outlet to the M1-ATX. I want to remind you that this configuration was working for almost a month before it died.

    The mobo and everything powers up fine with another AC-DC power supply.

    MatrixPC: it's not just that fan. I can plug in a different fan and leave the CPU fan unplugged, and the different fan displays the same symptoms. I can plug in no fans and plug in the hard drive, and the hard drive fails to spin up similarly.

  10. #10
    Newbie etown's Avatar
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    Quote Originally Posted by Erorus
    In a stunning display of overkill, the switch is a standard 110v AC household switch in a standard household switchbox,
    Damn. Well that's solid alright.

    At this point I'd whip out the multi-meter and check the voltages on the power connector while booting. I'm guessing that you're pushing the limits of the 12v rail just enough that the process of booting is putting you over the top.

    I know from personal experience that the M1-ATX is rock solid under the right situations, but gets really touchy with anything other than a mini atx board.

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