ATX PSU shorted blow fuse

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  • ITSYSTEMSALBANIA
    Member
    • Mar 2015
    • 37
    • Albania
    #1

    ATX PSU shorted blow fuse

    Hi all

    I have a cheap Winstar 450w atx psu when i opened it i see blown fuse i started measuring on primary side and found 2 diodes on bridge rectifier open and a n-channel mosfet CS2N60F shorted i replaced all this components and power om the psu the fuse blow and the 2 diodes shorted again i measured the mosfet that i replaced from gate to source and i get 85 ohm resistance.Please help me to troubleshoot this psu.
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 7967
      • Canada
      #2
      Re: ATX PSU shorted blow fuse

      Post good pictures from the top and the bottom of your power supply.
      Once the mosfet blows, usually there are bad components on the gate drive circuit of the mosfet.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30910
          • Albion
          #3
          Re: ATX PSU shorted blow fuse

          fet is probably locked on because of a blown drive circuit.

            Comment

            • ITSYSTEMSALBANIA
              Member
              • Mar 2015
              • 37
              • Albania
              #4
              Re: ATX PSU shorted blow fuse

              Hi thank you for your replies circled in red are the components that i replaced the primary caps are 200v 470uF the mains voltage in my contry is 220v is this a problem and here and the photos.
              Attached Files

                Comment

                • ITSYSTEMSALBANIA
                  Member
                  • Mar 2015
                  • 37
                  • Albania
                  #5
                  Re: ATX PSU shorted blow fuse

                  Looking on the primary side i see a blown C945 transistor and a open resistor.
                  Attached Files

                    Comment

                    • ITSYSTEMSALBANIA
                      Member
                      • Mar 2015
                      • 37
                      • Albania
                      #6
                      Re: ATX PSU shorted blow fuse

                      Replaced the C945 transistor and resistor and the psu is working.

                        Comment

                        • ep9es
                          Member
                          • Jul 2015
                          • 24
                          • Spain
                          #7
                          Re: ATX PSU shorted blow fuse





                          .

                            Comment

                            • ben7
                              Capaholic
                              • Jan 2011
                              • 4059
                              • USA
                              #8
                              Re: ATX PSU shorted blow fuse

                              You should also replace that resistor that looks burnt on the secondary (output ... low voltage) side, it's right next to a capacitor.

                              Also replace the output electrolytic capacitors ... they look to be cheap ones, they will fail sooner.
                              Muh-soggy-knee

                                Comment

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