Missing capacitor in Cooler Master Real Power M620

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  • mc4ren
    Member
    • Jul 2019
    • 37
    • Basque Country
    #1

    Missing capacitor in Cooler Master Real Power M620

    The PSU's part number is: RS-620-ASAA-A1
    I bought it as non working. I have checked all the caps and transistors, they look fine. But I found there is a cap missing (C49). Don't know if any of you guys has this PSU and can help me find the cap reference. Pics attached. Thanks.
    Attached Files
    Tags: None
    • Per Hansson
      Super Moderator
      • Jul 2005
      • 5895
      • Sweden
      #2
      Re: Missing capacitor in Cooler Master Real Power M620

      Just measure continuity from the positive to the ATX connector to find which voltage rail it is on, then just take an educated guess from that
      "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • mc4ren
          Member
          • Jul 2019
          • 37
          • Basque Country
          #3
          Re: Missing capacitor in Cooler Master Real Power M620

          Will try it, thanks

            Comment

            • redwire
              Badcaps Legend
              • Dec 2010
              • 3900
              • Canada
              #4
              Re: Missing capacitor in Cooler Master Real Power M620

              These pics look different but C49 is 25V and guessing 100-220uF.

              You can also also trace the cap back to a pin at the small controller board, then to the IC and look at the datasheet or app note.

                Comment

                • mc4ren
                  Member
                  • Jul 2019
                  • 37
                  • Basque Country
                  #5
                  Re: Missing capacitor in Cooler Master Real Power M620

                  Originally posted by redwire
                  These pics look different but C49 is 25V and guessing 100-220uF.

                  You can also also trace the cap back to a pin at the small controller board, then to the IC and look at the datasheet or app note.
                  Yes, it's exactly the same model! This is the area. Were you really able to see the cap there?
                  Attached Files

                    Comment

                    • mc4ren
                      Member
                      • Jul 2019
                      • 37
                      • Basque Country
                      #6
                      Re: Missing capacitor in Cooler Master Real Power M620

                      Originally posted by Per Hansson
                      Just measure continuity from the positive to the ATX connector to find which voltage rail it is on, then just take an educated guess from that
                      It goes to the 3rd pin of this IC, but I can't find any info about it. I'd say it's ST micro EZ6392(?) but I couldn't find anything.
                      Attached Files

                        Comment

                        • redwire
                          Badcaps Legend
                          • Dec 2010
                          • 3900
                          • Canada
                          #7
                          Re: Missing capacitor in Cooler Master Real Power M620

                          That IC is LM339 quad comparator. Pin 3 is power +Vcc.
                          I just zoomed in the picture to see a C49. I would say it is not a critical value, would try 100-220uF 25V there.

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