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Thread: M4-Atx Problems... Anti-thump still thumping and more...

  1. #1
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    M4-Atx Problems... Anti-thump still thumping and more...

    I've finally gotten my system completely wired up and 100 % functional, but my power supply (m4-atx) seems to be acting strangely and I'm hoping you guys can help me out.

    The main problem I've come across is that the amplifier anti-thump is activating too soon and releasing too late. The amps turn on right with the computer causing a thump, and stay on for the full minute after the computer has shutdown, causing another thump. I have the board set in p1 mode (1st switch down) and my firmware revision is 1.1 (according to the mini-box utility)

    Second, I've tried reseting to factory defaults by bridging jp1, following the manual; I don't get any response from the board (No "rapidly flashing led")

    Thirdly, I've tried messing with the thump delay in the mini-box utility and it doesn't seem to have any affect either, I've told it to send the changes but there doesn't seem to be any indication/verification that they've sent.

    Lastly, the voltage readings in the utility seem to be wrong as well, it tells me that my ignition voltage is 16v and my 12v line is 18V but in reality both are at 12.07, measured directly at my m4-atx.

    Are any of these common problems with the m4-atx, or is it likely that I have faulty board? Also, could there be something I may have messed up that's causing it to act this way?

    Thanks in advance,

    Silent3xecution

  2. #2
    Newbie jimmler's Avatar
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    Silent,
    I haven't verified the anti-thump problem, but I have the same issue with the utility not reporting the correct voltages. I have an HP lab supply that can deliver 12v at 50 amps all day long. Its panel meter shows 12v, two Flukes and a Simpson meter say the same thing. The mini-box application says 18v. I'm getting tired of all these annoyances. And of course, mini-box's tech support is bending over backwards to help......yeah, right. I have emailed their tech support and Laci and got nothing in response.
    -Jim
    Nipomo, CA

  3. #3
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    It would be nice if company's released products that actually worked like they should....and didn't go into hiding when they don't >.<


    You say you haven't verified the anti-thump problem, is that because you don't use the anti-thump or do you mean that it is working fine for you?

  4. #4
    Newbie jimmler's Avatar
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    The plan is to use the anti-thump when the project is done, but I don't have it hooked up to anything right now. I guess I could scrounge an amp to try it or maybe just hang another voltmeter on the thump connector. It should show 12v after the computer has finished powering up when it works correctly. If 12v is there too soon, then we know it's not working as described.

    Another thread is showing version 1.2 of the firmware has been released. Maybe that fixes it, but again, no solid info on how to update the unit short of building a PIC programmer.
    -Jim
    Nipomo, CA

  5. #5
    Constant Bitrate kibble's Avatar
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    Yeah, it would be nice if it was capable of being upgraded through the USB connection.

    I had to make myself the programmer that Fox put up the schematic for on another thread. I made it really tiny using nothing but smd components. First time I try making a board completely out of smd's! If anyone is interested in making your own, I'll post up the foil pattern so you can make your own. I do have to fix one thing on it though before I put it up.

  6. #6
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    I noticed a v 1.2 in one of the screenshots as well, but the mini-box site only shows the changelog up to 1.1...hmmmm. I'd love to get my hands on 1.2 if anyone here has it.

  7. #7
    Constant Bitrate kibble's Avatar
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    I just looked at the changelog a few minutes ago and it was showing at the very bottom:

    06/06/2008 Firmware 1.2: Introduced +750ms wait time between 5VSB on and ON/OFF pulse,value can be changed by user through USB

  8. #8
    Newbie jimmler's Avatar
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    I'm not sure the 750ms is gonna fix the thump problem unless the changelog doesn't mention the other fixes. Depending on the speed of your system, I would say the anti-thump shouldn't kick in until at least 5-10 seconds AFTER you have the Desktop. Since every system boots at different speeds, it doesn't seem possible they could hard code a number in there and have it work for everyone.
    We need the software. Does anyone from mini-box even visit this forum? I don't want to flame them or anything, but I really feel like I've been left out to dry on this power supply.
    -Jim
    Nipomo, CA

  9. #9
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    It doesn't even wait at all to power on the amplifiers, nowhere near being at the desktop. It really doesn't even have to wait that long, I only get a thump as soon as the computer turns on, and no more.

    I swear 1.2 wasn't there the other day! Am I just blind or is there no link for 1.2 on the site? I see the applications but not the firmware, which makes no sense whatsoever.

  10. #10
    Constant Bitrate kibble's Avatar
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    Yeah, there's no link to the firmware, heck, I didn't even see one for the 1.1 fimware. I got it from here. It's funny though that the screen shots on the mini-box site show 1.2 on them.

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