PSU got negative output!! help

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  • Brian C
    Senior Member
    • Dec 2006
    • 156
    #21
    Re: PSU got negative output!! help

    The problem of his power supply is the Power Good (PG) signal line (Grey color). It reads low instead of 5V. All other outputs are fine. Perhaps due to the supervisory IC or comparator problem...

      Comment

      • Krankshaft
        Badcaps Legend
        • Jan 2007
        • 2328
        • USA
        #22
        Re: PSU got negative output!! help

        He he funny on 2 out of the 3 pics that extra port is cut out .

        Thats why I don't use cheap multimeters.

        Any meter I own must have autoscale at a minimum.

        Aw Brain you beat me to the diagnosis .

        Indeed the mobo won't attempt to power up the supply if the power good generator doesn't send out its 5 volts.

        If all of the PSUs outputs are within range then replace the power good IC if you want to fix it.

        Sometimes these ICs malfunction and prevent the PSU from coming on when connected to a mobo.

        I have had wall wart switchers with dead PWM controllers after checking the FETs and output rectifiers for shorts I replaced the PWM IC and the PSU came back to life.

        So ICs can die without being brought under by another component in the circuit.
        Last edited by Krankshaft; 06-17-2008, 08:09 PM.
        Elements of the past and the future combining to make something not quite as good as either.

          Comment

          • jdimpas
            Member
            • May 2008
            • 39
            #23
            Re: PSU got negative output!! help

            Hello guys! thanks for dropping some comments, well the powersupply just blow up when i plug it again in the AC.. hahaha.. dammn powersupply.. made in china products!!.

              Comment

              • i4004
                Badcaps Legend
                • Oct 2006
                • 2029
                #24
                Re: PSU got negative output!! help

                i like happy-ends...

                  Comment

                  • Krankshaft
                    Badcaps Legend
                    • Jan 2007
                    • 2328
                    • USA
                    #25
                    Re: PSU got negative output!! help

                    Originally posted by i4004
                    i like happy-ends...
                    Good bye and good riddance .
                    Elements of the past and the future combining to make something not quite as good as either.

                      Comment

                      • kc8adu
                        Super Moderator
                        • Nov 2003
                        • 8832
                        • U.S.A!
                        #26
                        Re: PSU got negative output!! help

                        the psu in the pic is something i would crush for hand exercise.
                        at least you got a fireworks show without losing a board or worse.

                          Comment

                          • jdimpas
                            Member
                            • May 2008
                            • 39
                            #27
                            Re: PSU got negative output!! help

                            Originally posted by kc8adu
                            the psu in the pic is something i would crush for hand exercise.
                            at least you got a fireworks show without losing a board or worse.
                            yes, a bit fireworks! boomm.. haha.. well anyway thanks guys!

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