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Thread: M4-ATX Power On Issue

  1. #1
    Newbie
    Join Date
    Oct 2007
    Location
    Houston
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    54

    M4-ATX Power On Issue

    I also purchased an M4-ATX in the hopes I could escape the dreaded "Turn on" issue that I had with the M2-ATX.

    HOWEVER, I STILL have the "Turn on" issue! If I go to start the car, I see the case fan spin up, CPU fan spin up, and it appears the PC is cranking up. But, after about three seconds, it all goes black. It looks like power is just simply removed (exactly like the issue with the M2). Since I have a rocker switch on the 12v "Ignition" line going to the power supply, I can cycle the ignition pulse going to the power supply. After the car has started, I go from on-off-on from the rocker switch and my system comes alive.

    I just spent $130 to escape this very issue with my M2. I'd like to determine if it's my system or the power supplies. I've checked voltage (~12v on power wire, 12v on Ignition line, Ground is good). I've tried different "Ignition" sources (mirrors, ignition, fuel pump, etc) to trigger the power supply on. No change. I'm open for suggestions or the answer to this problem.

    Cheers

  2. #2
    Variable Bitrate Fox_Mulder's Avatar
    Join Date
    Apr 2004
    Location
    Melbourne, Australia The Truth Is Out There
    Posts
    319
    I managed to narrow my turn on problem to the fact that te M4 does not pulse the motherboard when in the HARDOFF state. Details in here
    Fox Mulder
    2004 Toyota MR2
    Intel Dual Core 2.0Ghz 1Gb DDR2 160GB SATA2 M4ATX Xenarc 700TSV TS BU353 DiNovo Mini Car2PC ODBII Bluetooth HF 16x2 Character LCD

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