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Cooler Master 550 watt - fan spins few seconds and then stop

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    #1

    Cooler Master 550 watt - fan spins few seconds and then stop

    Hi guys,

    i got this broken computer PSU with model number MPX5501AMAAB.

    i detected that 1 of the diode (model number: SB2100) was broken and replaced with a new one. but that not solved the issue as the problem is still persists which indicates that other components are also shorted. maybe someone can advice on what to do next?

    I attached some pictures for reference.

    on the other hand, i encountered quite a few PSUs with the same problem..i.e the diode is shorted/opened but replacing it not solving the issue..may this be a good indicator what is the real problem is? maybe some of you experience the same thing and can direct what should i be looking for for such situation.
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    #2
    Re: Cooler Master 550 watt - fan spins few seconds and then stop

    Lets start at the beginning. Do you have 5 volts on the 5vsb output line?
    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

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      #3
      Re: Cooler Master 550 watt - fan spins few seconds and then stop

      Originally posted by everell View Post
      Lets start at the beginning. Do you have 5 volts on the 5vsb output line?
      hi everell, thank you for your reply. based on this picture i got from the psu tester showing that 3.3v is missing..the 5 volts is present.
      Attached Files

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        #4
        Re: Cooler Master 550 watt - fan spins few seconds and then stop

        "bronze"=Sigh.

        You'll be lucky to get 7 years with the original caps. I don't expect that one to be a lick better than my 2008 FSP 500W. Looked like it likely didn't even last as long.

        Judging by appearance, it looks like the PSU was possibly made in the period of 2016-2019. If true, that would be recent enough that it failing now, is a big problem!
        Last edited by RJARRRPCGP; 11-08-2022, 08:05 AM.
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          #5
          Re: Cooler Master 550 watt - fan spins few seconds and then stop

          you have 3.3v - it's on the lcd.
          the leds refer to the extra cables on the left.

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            #6
            Re: Cooler Master 550 watt - fan spins few seconds and then stop

            Originally posted by stj View Post
            you have 3.3v - it's on the lcd.
            the leds refer to the extra cables on the left.
            i see. but the fan spins and stops after few seconds..i tested the fan and the fan is working well..what am i missing here

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              #7
              Re: Cooler Master 550 watt - fan spins few seconds and then stop

              remove and inspect the fan control pcb - it may be waiting for the heatsink to warm up, or monitoring the current being drawn.

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                #8
                Re: Cooler Master 550 watt - fan spins few seconds and then stop

                Originally posted by stj View Post
                remove and inspect the fan control pcb - it may be waiting for the heatsink to warm up, or monitoring the current being drawn.
                yea there is a small board that the fan is connected to it. i will desolder the board and inspect the ic

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                  #9
                  Re: Cooler Master 550 watt - fan spins few seconds and then stop

                  anyone knows any ic equivalent to apw9010? i am looking for the replacement of the fan controller ic

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                    #10
                    Re: Cooler Master 550 watt - fan spins few seconds and then stop

                    Originally posted by pronester View Post
                    i see. but the fan spins and stops after few seconds..i tested the fan and the fan is working well..what am i missing here
                    I learn that some atx psu need external load to come on operating state, dont judge on fan. Your tester shows all voltage present. If you connect motherboard, what happens?

                    See this thread as reference
                    https://www.badcaps.net/forum/showthread.php?t=114144

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