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Thread: DSATX startup

  1. #1
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    DSATX startup

    I have a DSATX powering my MSI RS482-IL mobo. Right now it sorta works. I turn the key and the red LED comes on, but the computer does not start. I have checked the power switch jumper pins for correct polarity with my voltmeter. The only way I can get my computer it boot is to manual short the power switch pins. After that everything works great, but I am getting tired of opening my trunk to turn on my radio. I am out of ideas at this point. Anyone else know what might cause this? or how to fix it? I have ordered the brainstem dongle, but not sure what to check once I get it.

  2. #2
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    Update to my situation. I had a friend turn the key and watch the computer and voltmeter. When the key is initially turned the whole computer turns on for about 1/2 sec (visually recognized by the LED fans), then shuts back down and the little RED LED stays on and is solid (no blinking). I'm assuming that ACC goes high and then and the computer powers up and waits for the start pulse. I am thinking that either the default 1 sec TURNONDELAY (100 x 10ms = 1000ms = 1sec) is too short for the mobo to initalize (whatever it does) then wait for the start signal or the default 1 sec PULSEWIDTH is to long and confuses the mobo. Can anyone confirm this? If this is the case I am hoping these parameters are programmable.

  3. #3
    FLAC
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    Quote Originally Posted by simple5
    Update to my situation. I had a friend turn the key and watch the computer and voltmeter. When the key is initially turned the whole computer turns on for about 1/2 sec (visually recognized by the LED fans), then shuts back down and the little RED LED stays on and is solid (no blinking). I'm assuming that ACC goes high and then and the computer powers up and waits for the start pulse. I am thinking that either the default 1 sec TURNONDELAY (100 x 10ms = 1000ms = 1sec) is too short for the mobo to initalize (whatever it does) then wait for the start signal or the default 1 sec PULSEWIDTH is to long and confuses the mobo. Can anyone confirm this? If this is the case I am hoping these parameters are programmable.
    Only other thing to check is to look at the polarity of your motherboard power switch with a volt meter. You may have the reverse of what the DSATX wants. Thus you would need this:

    http://www.mpegbox.net/DSATX/Invert%20PowerSW.jpg

    This helps explain what happens:

    http://www.mpegbox.net/DSATX/Motherb...r%20Switch.gif
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  4. #4
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    I have tried the jumper cable numerous times both what I believe to be correct and the reverse just to make sure. No response in either case. I have measured the voltage on the pins to verify the mobo is labeled correctly and it is. I don't have an oscope otherwise I would captured the pulse and make sure everything is working. I have been fiddling with this for a couple of days now and I have a work around for the turn on. You can set the bios to turn on the computer after "a/c" power is restored (obivously written before car-puters). However regardless of the jumper cable the shutdown pulse does not work and the computer is just turned off after the 90 sec timeout (like clockwork). From the drawings you sent me, is it possible that NPN transistor is bad (not sure if you are using TTL for this feature or and EEPROM/FPGA). Without an oscope its kinda hard for me to really tell if the voltage is actually being pulled down to 0v with only a 1sec pulse. My digital multimeter is too slow. Other than the startup/shutdown this psu runs great. Thanks for your help.

  5. #5
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    somethings to try:

    using your meter have you verified your acc, vin, and ground wire? your problem might lie there. What gauge are your wires?


    have you adjusted your pots?(P1 and P2).

    i had some problems in the begining, before i adusted the pots.
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  6. #6
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    Yup. I have a yellow top battery powering everything. Battery isolator installed and working. When I first got the battery it was at 12v, since I think it charged up to 13 now. I will check it again.

    The ignition switch also turns on my amps which work fine (amps are connected directly to the battery, not powered by the dsatx). Also the DSATX red led come on solid (no blinking) and runs beautifully after a manual turn on.

    The jumper cable it making contact atleast to the motherboard, I measured for 5v from the cable. I only get a few stray mV from the dsatx pins. I will play with the pots also, right now they are both full counter clockwise.

    I will keep at it. I find it hard to believe that everything works excepts the startup/shutdown. I think I am just missing something. Thanks for all the help.

  7. #7
    FLAC
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    Looks like pin 6 of your headder should be connected to the DSATX G1. Is this what you have?


    Plug in the computer to a normal AC-DC power supply in the house.

    You need to figure out what kind of pulsing your motherboard is using. It is either pull to +5VSB or pull to Ground. If it is pull to +5VSB, that would explain this problem.

    Measure the voltage between ground and both of the power switch pins on your motherboard. If you short one to ground it should turn on. Of course if you short them together it will turn on, but try individually shorting them to ground with a jumper wire or something. That will rule out this issue and tell you which one is the acutal sense line.
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  8. #8
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    Yup. I have pin 6 connected to G1. That would make sense if the if it is a pull up to 5v. I won't have time test this until the weekend. Right now I'm busy learning to fly planes. Thanks for the help.

  9. #9
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    I confirmed today that my mobo pulls the gnd pin high to 5v to signal a button press. Anyone have any idea how to get the DSATX to work with this?

  10. #10
    FLAC
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    Quote Originally Posted by simple5
    I confirmed today that my mobo pulls the gnd pin high to 5v to signal a button press. Anyone have any idea how to get the DSATX to work with this?
    Ok, so you measured both pins with the computer turned off. One measured ground, and one measured 5 volts. Then you shorted the pins and measured the voltage with the short? If you measured 0 volts, you should be compatible with the DSATX. If you measured 5 volts, your incompatible. Thus need the drawings from my above posts. Look at the .jpg/.gifs

    You can do it with two resistors and a 3906. Or you can use a small relay.


    -Jeff
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