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Thread: Problems with new PSU

  1. #1
    Maximum Bitrate nasa's Avatar
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    Problems with new PSU

    Hi,

    Just got my brand spanking new m3-atx PSU today, so I rearranged my case plugged the bad boy in... and now I am posting here

    So what I have was a *working* system that I replaced the OPUS 120 with the m3-atx (OPUS takes 18 seconds to apply power to MB, which I am hoping the m3-atx can improve on). With only the cpu/memory/fan plugged in, applying power to the PSU via a 10 amp battery charger produces the fan starting up after about 6 seconds -- but no post and no video. The new PSU has 6A on the 5V chain, 6A on the 3.3V chain, and 4-6A on the 12V chain. These numbers are very similar to the OPUS I am replacing (8,8,3.5). I have tried the new PSU with it set as a straight PSU and as an intelligent one, with no difference in behavior. I also switched around the on/off cable/jumper with no difference. Could I get any hints on troubleshooting this? Thanks

    BTW: computer specs are,
    MB899 Intel Core Single/Duo Mini-Itx Motherboard 945GM
    Intel Core 2 Duo Mobile 1.66GHz
    --max power req - Core™ Duo 2.0GHz w/ 2x 1GB DDR2; +3.3V: 3.02A, +5V: 2.81A, +12V: 1.76A

  2. #2
    Maximum Bitrate nasa's Avatar
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    Hmmm...

    Answering my own post -- tried a regular PSU and system booted up fine. However, when I had the m3-atx in the board, it acted (as best as I could tell) as expected. It started up within 5 seconds and started sent the MB the on signal (fan started), it even shutdown as expected. I've looked over the specs a number of times... Shouldn't this PSU work with my MB?

  3. #3
    Neither darque nor pervert DarquePervert's Avatar
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    You say the battery charger outputs 10A, but what is the voltage it outputs?

    Che the manual, specifically page 5.
    The current the M3 can supply is dependent upon the input
    Understand that those values are MAX output values for each rail.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  4. #4
    Maximum Bitrate nasa's Avatar
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    Thanks for the reply,

    The Battery charger outputs 12V DC (measured 12.41 with my voltmeter).

    Understand that the 12V line varied based on the input, based on that 6A is what it should be able to provide.

    BTW: I have measured the pc using only 2 amps when running with the basics connected...
    Edit: I also measured the output from the m3-atx via the single molex, which gave 12.14 and 4.84 for the voltages.

  5. #5
    Maximum Bitrate locs4dayz's Avatar
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    Quote Originally Posted by nasa View Post
    Thanks for the reply,

    The Battery charger outputs 12V DC (measured 12.41 with my voltmeter).

    Understand that the 12V line varied based on the input, based on that 6A is what it should be able to provide.

    BTW: I have measured the pc using only 2 amps when running with the basics connected...
    Edit: I also measured the output from the m3-atx via the single molex, which gave 12.14 and 4.84 for the voltages.
    I had similar problems with the M3...so I returned it for an M4, and all is now well in the Chrysler 300m.
    Linux(Learning the curve...Like when driving!!!)
    Worklog!!!http://www.mp3car.com/vbulletin/fabr...l-worklog.html

  6. #6
    Maximum Bitrate nasa's Avatar
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    Yeah,

    I'm looking at that... Just wondering about fitting it in.

    Oh, and it takes longer to apply power (per the owners manuals)

  7. #7
    Maximum Bitrate locs4dayz's Avatar
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    Quote Originally Posted by nasa View Post
    Yeah,

    I'm looking at that... Just wondering about fitting it in.

    Oh, and it takes longer to apply power (per the owners manuals)
    It takes my M4 about 5 secs to apply power...
    Linux(Learning the curve...Like when driving!!!)
    Worklog!!!http://www.mp3car.com/vbulletin/fabr...l-worklog.html

  8. #8
    Variable Bitrate billmee's Avatar
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    For reasons I can't explain I have not been able to power a Carnetix psu directly from a charger, add a battery and it starts fine.

  9. #9
    Newbie DeLorean Dave's Avatar
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    Quote Originally Posted by billmee View Post
    For reasons I can't explain I have not been able to power a Carnetix psu directly from a charger, add a battery and it starts fine.
    Chargers do not usually put out a nice clean 12-14 Volts DC. Their output is usually pulsating DC. This is likely the reason...

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  10. #10
    Maximum Bitrate nasa's Avatar
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    Thanks

    DeLorean Dave, and bilme -- taking your notes, I tried powering the m3-atx from a desktop psu which indeed worked. So... based on the above discussion -- a car battery is closer to a psu than a battery charger?

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