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

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  • pronester
    Senior Member
    • Oct 2019
    • 51
    • Malaysia
    #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.
    Attached Files

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    • everell
      Badcaps Legend
      • Jan 2009
      • 1514
      • USA
      #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)

        Comment

        • pronester
          Senior Member
          • Oct 2019
          • 51
          • Malaysia
          #3
          Re: Cooler Master 550 watt - fan spins few seconds and then stop

          Originally posted by everell
          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

          if you find these attachements useful please consider making a small donation to the site

            Comment

            • RJARRRPCGP
              Badcaps Legend
              • Jul 2004
              • 6304
              • USA
              #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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                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 31304
                  • Albion
                  #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.

                    Comment

                    • pronester
                      Senior Member
                      • Oct 2019
                      • 51
                      • Malaysia
                      #6
                      Re: Cooler Master 550 watt - fan spins few seconds and then stop

                      Originally posted by stj
                      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

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 31304
                          • Albion
                          #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.

                            Comment

                            • pronester
                              Senior Member
                              • Oct 2019
                              • 51
                              • Malaysia
                              #8
                              Re: Cooler Master 550 watt - fan spins few seconds and then stop

                              Originally posted by stj
                              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

                                Comment

                                • pronester
                                  Senior Member
                                  • Oct 2019
                                  • 51
                                  • Malaysia
                                  #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

                                    Comment

                                    • harp
                                      Badcaps Veteran
                                      • Jun 2022
                                      • 648
                                      • Planet Earth
                                      #10
                                      Re: Cooler Master 550 watt - fan spins few seconds and then stop

                                      Originally posted by pronester
                                      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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