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Thread: ITX shuts down after 20-30 sec

  1. #1
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    ITX shuts down after 20-30 sec

    Hello,

    Looking at all the threads, I cannot figure out my problem:
    M1000 Mb with Slim DVD + 2.5"HD + USB GPS + Pinnacle PCTVPro+ USB WLAN

    I use a ITPS + PW80.
    Computer switches on, but after 20 sec (just before Windows kicks in) the MB goes to a hard stop.
    Input voltage 20.4V Current 3.3A mesured at the source
    After the ITPS I get 12.4V, Which drops slowly after the MB has been switched off hardly.
    Calculating the Max power needed, I never exceed 53W. So PW80 should be sufficient.

    When I use another power supply (90W) without ITPS, the system works fine.

    Where do I have to start looking? The ITPS or the PW80?

  2. #2
    FLAC IntellaWorks's Avatar
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    .

    I ran into the same exact problem w/ the same MOBO as you. I was designing a "bench power system" so I can run my car-pc on a workbench in my house. I used an older power supply... (by the way my system has ITPS + 80w power supply also)

    Made a switch that acted as the ignition switch, the system came on perfectly the first time... Booted to windows and everything... shut the machine down, resarted then I got the 20 or 30 seconds and random restart.

    I racked my brain a bit, checked the HDD connection which was loose. Fixed that, but still had the same problem. Racked my brain over the weekend, went into BIOS (checked what the MOBO was reading for voltage, it said 9.2v @ the 12v line... DOH! it was obviously my power line comming into the machine, updated the BIOS and set up the new "Vehicle power test system" (using another ATX power supply)

    Let me say a few things before I close, I didn't have a voltage meter during all this (left it @ work) This problem would have been solved easily with that tool... Also this is my bench test system, I had to emulate a vehicle's power system 12v (with ignition signal) I did this by taking an ATX power supply from a normal computer out... I tapped off or jumpered off the green and black wires on the ATX connector. (This tricks the supply into turning itself on whever it has wall power) Then I tapped into two yellow wires (12v) one has a on/off switch the other was steady 12v... I then connected this to my car-pc's ITPS.

    To turn my system on, I make sure my ATX power supply is running then simply slip the switch and poof.. my car Pc thinks its in the car !


    I honestly would check the power comming into the machine, boot the machine and see what the MOBO is reading for power on the 12V line. Also Update the BIOS too while your playing with things... make sure you download the VGA drivers too (you have to update both at the same time even though your not messing with VGA yet)

    Test what the ITPS is giving to your machine for voltage... You know it seems like that little guy's "regulation" actually under powers the machine.. even though my ystem was up and running the 12v line reads as getting 10.4 (which is kinda low, below atx standards)
    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

  3. #3
    Constant Bitrate
    Join Date
    Oct 2004
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    137
    The reason for the under-regulation IntellaWorks experienced is that the ITPS has a significant voltage drop due to regulation.

    Since he was supplying it with 12volts from a psu, the voltage dropped from the 12v to 10.4.

    The ITPS was not doing anything wrong...

    ColdPhreze
    14" LCD, EPIA MII-10000, 256MB, Wireless LAN, GPS, CDRW/DVD, ELM Scan,
    200wRMS inverter (for the screen), CarPC Pro v2.4 Power Controller,
    2 12" Pioneer Premiers, Sony 6x9s, Sony Xplode Class D mono block, Pheonix Gold A/B amp for highs

  4. #4
    FLAC IntellaWorks's Avatar
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    .

    Ahh yes it was doing anything "wrong" Technically speaking my ATX power supply (not the one in my car pc) is already regulated. (So adding a constant clean, regulated 12v to a device,ITPS, that is looking for a line of power that increases or decreases voltages can also create under powering problems)
    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

  5. #5
    Constant Bitrate
    Join Date
    Oct 2004
    Posts
    137
    IntellaWorks, Yes, the ATX is regulated, but the ITPS does not care. It regulates it again and causes a voltage drop. That is how it is designed (not by me, and I don't like it at all, but to it's defense...). The ITPS does NOT increase voltages, only decreases them. For example: give it 8 volts, it cannot boost them to 12volts. However, given 14volts, it can regulate it down to 12volts.

    This is verified by a direct quote from the mp3car.com website (http://www.mp3car.com/products/itps.html):
    "Important: The ITPS requires at least 13.3V input to work properly. In an automotive environment that means that the engine must be running in order to provide that amount of voltage. The ITPS will not supply power during an engine crank and might not work reliability while the engine is off. Normal use with the engine running should be fine."

    So, it is working as designed.

    ColdPhreze
    14" LCD, EPIA MII-10000, 256MB, Wireless LAN, GPS, CDRW/DVD, ELM Scan,
    200wRMS inverter (for the screen), CarPC Pro v2.4 Power Controller,
    2 12" Pioneer Premiers, Sony 6x9s, Sony Xplode Class D mono block, Pheonix Gold A/B amp for highs

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