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atx psu operation

Discussion in 'Misc Electronics' started by [email protected], Aug 5, 2005.

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  1. Guest


    can anybody in this newsgroup give me an idea on the detailed
    operation of an atx psu. i already knew from this group that if i short
    out black and green connection in the psu, it will power up. i tested
    it and it worked. but i want to know the concept behind its turning
    this is because i have an atx psu here that does not power up even
    connected to the motherboard or when shorted out. (black-green). i want
    to troubleshoot it but i do not want to start yet until i already
    understand how this psu operates so that i may know where to directly
    troubleshoot the problem. is it in the primary side circuit or in the
    secondary side or logic/controller for the on/off state.

    thnks in advance,

  2. Guest

    thank you for your response. i was enlightened.
  3. DaveM

    DaveM Guest

    Look at the web page at It has
    a schematic and theory of a typical ATX power supply. Keep in mind that
    this is just one example of a design.. the unit that you have may be
    similar of very different.

    Above all, when you start poking around inside the power supply, be very
    careful. Lethat voltages are present inside the unit, and will maim or kill
    you if you aren't careful.

    Dave M
    MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
    the address)

    Never take a laxative and a sleeping pill at the same time!!
  4. quietguy

    quietguy Guest

    I would suggest that unless you are very experienced in repairing mains
    powered equipment that you would be much safer picking one up from
    computers thrown in the tip - very easy to electrocute yourself poking
    around one of these

    David - who shudders at the thought of beginners playing with these power
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