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Thread: getting an odd motherboard to power on

  1. #11
    Maximum Bitrate
    Join Date
    Oct 2001
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    Ontario, Canada
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    845

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    Son-of-a-

    I'm real lucky that I was able to post that. @#$(*@#$ing stupid BB software didn't like one of the links that I had posted, so it just said "too bad, hit back button to retry", unfortunately there is THIS tag in the page:

    <META HTTP-EQUIV="Pragma" CONTENT="no-cache">


    THUS, it will not cache, THUS you've just lost everything that you've typed. Thanks a lot UBB!

    Fortunately I am not easy to defeat, and with a RAM hex editor I pried the information out of IE's cold dead grip and reposted it!

    Sorry if this was OT, but had to say something after I successfully recovered it!
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  2. #12
    Low Bitrate
    Join Date
    Apr 2001
    Location
    San Marcos, Texas
    Posts
    62

    Post

    This might not help, but I had a similar problem. First try to power you arise with a car battery and see if it will post. I hade an old AT PSU that I was using to power my Arise but the only way to get it to work was to plug the old AT PSU into an old motherboard. After doing that it would power up my arise.
    Jeff Seifert
    Work in progress!!!!! Website is on its way!!!!

  3. #13
    Newbie
    Join Date
    Nov 2001
    Location
    AZ
    Posts
    9

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    OK to clear up this little P13 connector business:

    With original supply:

    Red: always +5V
    White: with computer off, +5V, with computer on 0V
    Ground: well its ground...

    This white wire is the only one that ever changes. All the P8 and P9 wires are all normal voltages no matter what. This white wire seems to turn on the original power supply somehow. But I don't know how to reproduce it because not connected to anything (power supply by it self, just plugged into wall) the red and white both are +5V. I don't understand how the motherboard can change this +5V if it is coming from the power supply...not the motherboard.

    The power button connects to the [B}motherboard[/B]. It is a button and is only "on" for an instance...it is not a switch.

    I just need some help understanding how the motherboard decides to turn on.

    Telek, thanks for all your help. I have emailed Siemens asking for information. I'll keep you all updated if I solve the situation..so some poor soul doesn't have to go through this....

    jssaggie, the problem is not getting my AC-DC AT supply to turn on...just the motherboard.

    Again thanks for all the help. I'll try some new ideas once I get off from work.

    Nate

  4. #14
    Maximum Bitrate
    Join Date
    Oct 2001
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    Ontario, Canada
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    ofr the P13, what happens when the computer decides to power off, does it change again?

    It would be quite easy for the motherboard to just connect the +5 and the ground, and that would signal the power supply to power-on. perhaps when 5V is fed back into the white wire it'll power off again, I dunno. That's about all that I can think of.
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

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