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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
    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?

    Comment


    • #3
      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.

      Comment


      • #4
        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.

        Comment


        • #5
          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

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          • #6
            Yeah,

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

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

            Comment


            • #7
              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

              Comment


              • #8
                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.

                Comment


                • #9
                  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...

                  Dave D
                  eLectricDeLorean.com
                  1981 DeLorean DMC-12
                  VIA SP13000, Xenarc 700TSV, 100GB hdd, 1GB ram, WinXP, BU335 GPS, iNav 3.0, Griffin PowerMate, M2-ATX, HQCT-AM/FM USB Radio (Software by Luc)
                  PMD-1208 USB Data Acquisition
                  Flux Capacitor

                  Kensington USB 2.0 BT Dongle just dangling

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                  • #10
                    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?

                    Comment


                    • #11
                      backwards-- a psu is closer to a battery then a charger

                      ac-dc power supplies have tighter regulation because many devices that require dc power in a ac-environment cannot take loosely regulated power(loose/tight regulation refers to how close the output stays at a certain voltage--loose reg. will fluctuate some)

                      battery chargers typically do put out a slight amount of ac ripple(or called loose dc regulation) to prevent, and/or break apart oxidation on lead acid battery plates...
                      My OLD 2001 Mitsubishi Eclipse GT:
                      "The Project That Never Ended, until it did"


                      next project? subaru brz
                      carpc undecided

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                      • #12
                        I think of chargers as being high in ripple merely to save money (since they don't need smooth dc). After all, a battery usually behaves like a capacitor (it filters out ac).

                        And yes - pulsing is used to de-sulfate plates etc. (But they wouldn't give us something for nothing LOL! - not with all these wanker 2300mA, 3200mA, 4500mA variants ...)

                        Comment


                        • #13
                          Thanks everyone,

                          have the setup in the car and all is running...

                          Except, it's not to what is/was mentioned in the manual:

                          "Sends ON pulse to motherboard when ignition is ON for more than 2 seconds,"

                          But yet it takes 10 seconds for the fan on my computer to come on and another 6
                          before the computer actually starts... Is there a reason for this?

                          Thanks again

                          Comment


                          • #14
                            On this psu question...

                            Is it really the PSU or could the motherboad have something to do with it? It seems really odd that with 2 different DC-DC adapters it takes 10 - 15 seconds before I hear the fan spin up and another 6 seconds before the BIOS screen appears. I would have expected that after the ON signal is sent from the adapter, the MB would go into BIOS checking right away (power is already available) or am I missing something...

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