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Thread: DCDC USB Power Switch

  1. #21
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    Hooray I got my new PSU, but I'm still having problems. The power switch stays closed closed the computer to turn on but shutdown after 4 sec. After than I can't get it to turn back on until I remove the switches. Am I missing a setting?

  2. #22
    Maximum Bitrate kegobeer's Avatar
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    I'm not sure what's going on with your dcdc-usb p/s. I have one that's powering my D945GSEJT and I haven't had any problems. Are you absolutely positive that you have good 12V and ignition wires, and a good ground going to the p/s? Which voltage (0-7) did you change to 19V when you used the USB software? What motherboard do you have?

  3. #23
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    Dec 2010
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    kego. I'm positive I have good 12v, ign, and ground. The problem is the switch is staying "pressed" after the psu detects ignition. The barebone system I'm using is a ECS MD110.
    When I press the physical power switch on the mobo the circuit closes and as soon as i let go of the switch the circuit is open. However the dcdc usb is leaving the circuit closed as long as it has ignition acting as though I'm holding the button down. Did i miss a setting in the software or something? Oh and my pushdown time is set to 200msec

  4. #24
    Maximum Bitrate kegobeer's Avatar
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    I haven't used the software, since my system is 12V, so I can't really help you there. I did everything with just the jumpers. Maybe you could do a reset and then just change the voltage on the 18 or 24 volt position to see if that helps. What are your soft off/hard off settings?

  5. #25
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    I'm having the exact same problem. What is the deal? What I do notice is if I hold down the power button on the computer it does the exact same thing. So it is as if the dcdc is holding onto the pulse. But I dont understand why if I just plug the computer to an outlet and leave the power switch attached it doesnt do the same thing. Everything is on default settings except the 19V.

    EDIT:
    Finally got it to work, at least on my work bench. Just needed to get the psw time precise...very tediouse. Mine is 300ms. Let's hope everything works in the car.
    Last edited by Champak; 01-23-2012 at 11:25 AM.

  6. #26
    Variable Bitrate
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    So since I put this in the car now, I'm having the same problem again. This time going through every incriment is WAY too much (back and forth to the truck, manual booting). Is there an easier way to figure this out?
    Also, when I change the paramater, do I need to remoe the 12V power to the DCDC, or just turn it off and on by ways of the remote switch?
    Last edited by Champak; 04-16-2012 at 11:42 AM.

  7. #27
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    I have also noticed there is a constant 1.2V out the dcdc switch. Shouldn't there be 0V once it turns the device on? Wouldn't that cause the computer to reboot...turn on then immediately off?

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