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atx power supply

Discussion in 'Power Electronics' started by camilozk, Sep 1, 2016.

  1. camilozk

    camilozk

    109
    4
    Apr 20, 2014
    hi!

    for some time now I have been using a computer atx power supply for different experiments. I have several outputs (3.3v / 5v / 12v) and in a project I was using the 12volts rail to feed and arduino and the 5volts to feed a waterproofed LED strip that was outdoors under the rain. After some time, the 5volts rail stopped working.

    is it possible that due to a short circuit in the 5volts lines because of the rain , 5v lines stop working while 12v and 3.3v lines continue working?

    that would mean that the LED strips are not waterproof as expected, but could it be something else that caused 5volts rail to stop working while 12v and 3.3v lines continue working?
     
    Last edited: Sep 1, 2016
  2. shrtrnd

    shrtrnd

    3,651
    449
    Jan 15, 2010
    I'm assuming you checked the actual voltage output of your power supply, and that you're sure the 'waterproof'
    LED strip itself is not defective?
    If, sounds to me like you should take a look at the 5v Regulator in your power supply, and maybe be back in business.
    Sure, the LED strip may have shorted and zapped the 5V input supply. (But not necessarily) All electronics fail at one time or another.
     
  3. camilozk

    camilozk

    109
    4
    Apr 20, 2014
    I have no way to be sure that the LED strips are waterproof. that is why I am interested in figuring out if a short circuit provoked by a defective "waterproof" LED strip would damage the 5v rails while leaving the other working.

    today I turned on the power supply before open it to check it, and it results that I get 5v... (?)
     
  4. cjdelphi

    cjdelphi

    1,098
    104
    Oct 26, 2011
    A short should trip the power supply
     
  5. camilozk

    camilozk

    109
    4
    Apr 20, 2014
    what does "trip" mean in this context?
     
  6. cjdelphi

    cjdelphi

    1,098
    104
    Oct 26, 2011
    Short out a 3/5/12v rail to ground (black wire) it shuts off fast
     
  7. Atton

    Atton

    6
    0
    Aug 14, 2015
    Check the rail with a multi meter if you don't get anything then it is likely dead. Which would be strange since a short regularly just shuts off the supply altogether.
     
  8. camilozk

    camilozk

    109
    4
    Apr 20, 2014
    yes. as I said, the other day 5v was working, so the problem is intermittent...
     
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