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PowerMac G5 psu not turning on

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    PowerMac G5 psu not turning on

    Hello, recently one friend borowed me a G5 psu which doesnt work.
    Its a 1000W API4FS13. When i plug it in, 5Vsb and 25Vsb are present. When i connect PS-ON to ground, the relay clicks two times and nothing happens, no voltage on 3,3V, 5V, 12V pins.
    Another thing is - I cant find PWM ic on the board. I looked at it for half an hour and couldnt find the damn little thing. Maybe i am just blind.
    Anyway, i hope someone will help me fix that thnig.

    #2
    Re: PowerMac G5 psu not turning on

    maybe the chip is under the board or hidden under a large component - got a few foto's ?

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      #3
      Re: PowerMac G5 psu not turning on

      Ill post some photos later - now i have too much of unexpected work...

      Comment


        #4
        Re: PowerMac G5 psu not turning on

        HERE is all the pornography, i mean photography...looks like pornography to me If you need more photos or photos of specific parts, i can do more.
        Last edited by neclovek; 01-01-2015, 11:06 AM.

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          #5
          Re: PowerMac G5 psu not turning on

          The bigger chip in the 6th picture is a Fairchild ML4800CP PFC/PWM combo controller.
          Attached Files
          Last edited by cheapie; 01-01-2015, 10:18 PM.

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            #6
            Re: PowerMac G5 psu not turning on

            Oh, okay, now it makes sense, thanks. I was just expecting something like KA7500 or something like that. Well, I gues that I was expecting wrong
            Now "only" thing left is to fix the damn thing...

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              #7
              Re: PowerMac G5 psu not turning on

              Nobody?

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                #8
                Re: PowerMac G5 psu not turning on

                we where waiting for you.
                looking at the datasheet, find the startup capacitor on pin5 and replace it.
                dont question how it looks - just replace it.

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                  #9
                  Re: PowerMac G5 psu not turning on

                  Originally posted by stj View Post
                  dont question how it looks - just replace it.
                  But i need to know it. I dont have proper tools to unsolder whole controller board so i cant just look. Is it electroyitic? Or smd?

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                    #10
                    Re: PowerMac G5 psu not turning on

                    it'selectrolytic, but i dont nowif it's smd.
                    if it is then it will be even more likely to be dried up.

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