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M3-ATX Power Issues

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  • M3-ATX Power Issues

    I'm having a problem with my M3ATX in my car setup.

    First, I have a Intel DH77DF and an i3 3200T (35w) with only the ram and wireless card installed.

    When I hook everything up and power it on the lights come on but the computer does not boot.
    If I remove the p4 connector, the fan starts up for 2 seconds and then powers down.
    I tried reversing the PW header on the board as well, with the same results.

    The board works fine connected to a 300w PSU I have laying around, and I don't think that I'm drawing too much power for the unit.

    Any insight would be apprectiated, I would rather avoid having the go through the hassle of returning the psu and purchasing a new one ( I would pick up an m4-atx this time ) if the problem is something I have simply overlooked.


  • #2
    first of all, m4-atx is ultra noisi. you wil regret it. so i would suggest going in a little search in the forums before you do so....

    now for your problem. have you tried hooking the motherboard in another PSU?? also, you should use a digital multimeter to check if the rails do give 12v and 5v! do they?


    • #3
      I think you are over the limit with m3 and that board. I would go with the dsatx unit instead of the m4 if you are going to replace. The M3 12v rail is only 6 amps, 8 amp peak, only 72w - 96w peak. SNO


      • #4
        Shoot, I was afraid that was the problem.
        I knew the board was OK since I tested it with another PSU and checked the rails with a multimeter and I figured the setup was close to upper max of that PSU, but hopped I could get away with it I suppose I could always hang onto it and use it in another project that inevitably will come up!

        For the DSATX:
        Will any Serial to USB interface work (example) or do I need to get the brainstem and one of the recommended serial to USB cables for it to work?

        I was looking at the manual and it looks like the AUX on J1 F1+2 can be used for the remote amp turn on.
        Is this correct and do I need some sort of circuit to use it as a remote turn on, or can I connect the wire directly to the amp like with the m3?

        Thanks for the recommendation and insight, you've been quite helpful!


        • #5
          I think it needs the brainstem, I use it directly to a serial port so I can't answer about using a specific serial/usb converter but I think you could do no wrong using any FTDI model. You sholuld be able to connect to your amp. But might need a relay if not enough of a signal. Good luck and keep us posted with your progress. SNO


          • #6
            You don't need the brainstem to use the DSATX.
            It's very helpful for monitoring the PSU and fine-tuning the configuration.
            Have you looked in the FAQ yet?
            How about the Wiki?

            Under normal circumstances, a signature would go here.


            • #7
              I wonder what else you are powering from your M3-ATX...
              I have a Z77-WiFi board for mine with a 55watt i3, 2 8gig memory cards, 120gig SSD, low profile CPU fan and mine is running great.

              What kind of video are you using? On board or separate video card?

              I used the onboard video on mine.

              Also, have you tested the power supply out with no jumpers on the board? If so it will work like a regular power supply. I have mine setup right now on the shortest setting which I think does a shut down instantaneously and a hard power off in like 1 minute.

              Things to make sure of.. I was told it would work fine just using the 20 pins it lines up with and you didn't need the CPU connection. (The 4 pin power connection.) The CPU connection is to stabilize the power to the CPU and I see it as a necessary thing. I made an adapter for mine so I plug the connector into the older style HD power connector. I figured if I already wasn't giving it the full 24 pins of power I wanted to make sure I had the 12volt CPU stuff hooked up.

              Also, what are you using to power the M3-ATX? The issues you are having sound similar to another member that had problems although they got further into their boot up sequence. It ended up being that the power supply supplying their 12 volts to the M3-ATX was way under sized and was tripping out when the computer was booting. Sounds like you may not be providing enough power to the supply to even get that far.



              • #8
                I didn't mean to make you think you need the brainstem to operate the dsatx. I was just answering the question of whether you could use another type of product on those pins. I also forgot to ask, Are you supplying enough power to the M3?. What size cables do you have powering the M3?. Depending on the length of the wires you may not be getting enough amps to the power supply. Just a thought SNO


                • #9
                  I couldn't edit my post fast enough yesterday (still probationary apparently) and almost immediately after posting I found this link which was helpful.

                  I did know the brainstep wasn't required from reading the manual for it but the features sounded cool and I was just checking to see if anyone had tested / or knew if a cheap interface would work. If I had to guess, I would say yes given the information in the manual.

                  As for the M3, I'm only powering the board, 8 gigs of ram, wifi/bt card, 35w i3, and the low profile fan and I did not include the 120gig SSD in my testing. I have a molex to p4 connector running to the 4pin 12v on the board.

                  The testing was done in the car. I knew there is more than enough power going to the dist block, and a good ground (checked with a meter) but I was using some alligator clips to connect the red/white/black wires to the dist blocks. This might be the cause of a low amperage problem and I will test with a heavier wire when I get out of work.
                  Thanks for the suggestions Rodney/SNO.


                  • #10
                    You should be using LESS power than I am with mine and I am not even beginning to push the M3-ATX limit so it is likely that your power to the unit is lacking unless your motherboard is a monster at power or you didn't mention something.


                    • #11
                      I just checked it again. The computer boots (insanely fast, I love SSD) plugged into a PSU ( 20pin, with p4 connector attached) on the bench. However when attached to the car the light on the mobo comes on when I press the power button (PSU in dummy mode) and I hear the power "wine" but the fan does not start, nor does the boot sequence. Without the p4 connector on the board, the CPU fan spins up, then powers down and no boot.

                      I think the mobo I have is drawing too much power at start up, I guess I'm going to spend a little extra and get the dsatx