Xilence 1200W. Keeps restarting

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  • victorcas
    Member
    • Oct 2021
    • 12
    • España
    #1

    Xilence 1200W. Keeps restarting

    I have repaired a few PC PSUs before, but the problem has always been a broken Mosfet and blown capacitors fails. Now I am facing a PSU problem that I haven't seen before.

    I have a Xilence 1200 PSU that had 4 broken capacitors on the 5V and 3,3V lines, and a faulty mosfet driver (A6069H). After replacing these components, the PSU starts up and turns on the fan providing all the correct voltages at the output, but shuts down after a second. when the output is low again (capacitor discharge, I guess), the PSU starts up again and repeats the whole process.

    I think it has to be with some kind of overvoltage or overcurrent sensor, but I can't find the faulty component. I have also tried connecting a small 12V motor to the 12V output and I see that it keeps restarting but the motor turns (I guess I shouldn't try to connect an inductive load, but that's what I have...).

    I uploaded some pics with a red circle/square over the replaced components.

    I have no idea how to proceed. Any advice or hints would be appreciated. Thanks in advance!
    Attached Files
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    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6037
      • USA
      #2
      Re: Xilence 1200W. Keeps restarting

      Look for a capacitor that is around 10 to 50uf or could be a little higher than that is close to the switching power supply regulator ic chip ( that you have replaced already A6069H) and replace it even if looks ok and see if it makes a difference or not

      There are some ATX switching power supply that require a load on either the 5 or 12 volt rail to work correctly so be aware of this as well use some automotive type head light bulbs would work better for this I done this myself

      Or you could have a rail that is pulling to much current

      Check with out power to board and see if you have a short on any of power supply rails with a ohm meter

      I hope this helps you
      Last edited by sam_sam_sam; 10-30-2021, 07:34 PM.

        Comment

        • victorcas
          Member
          • Oct 2021
          • 12
          • España
          #3
          Re: Xilence 1200W. Keeps restarting

          Thanks for replying!

          There are 3 capacitors around the circuit and all of them are 35V. The values are 10uF, 40uF, 220uF. I have checked them with a multimeter and they are all ok but I have replaced them anyway and it doesn't work.

          I have tested the power supply using a DC motor as a load but it doesn't work.... I will buy a car light to try it because I can't find a 12V resistive load that can handle a large amount of current. I have small bulbs that can draw around 80mA (I have also tested the PSU with one of these).

          The Impedance at the output is:

          12v - 60 Ohms
          3.3v - 94 Ohms
          5v - 42 Ohms
          5v VSB - 44 Ohms
          -12V - 570 Ohms

          I'm not familiar with the impedance values of an ATX power supply, but it doesn't seem to be shorted. right?

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6037
              • USA
              #4
              Re: Xilence 1200W. Keeps restarting

              Do the power supply rails have a power resistors on them because your ohm reading are a little low

                Comment

                • victorcas
                  Member
                  • Oct 2021
                  • 12
                  • España
                  #5
                  Re: Xilence 1200W. Keeps restarting

                  I have tested the PSU using a motherboard and it still does the same...

                  Originally posted by sam_sam_sam
                  Do the power supply rails have a power resistors on them because your ohm reading are a little low
                  Yes, it looks like it has SMD power resistors. I don't know their value because the "001" code doesn't seem to follow the standard (I'm confused). If I measure the resistance there, the multimeter shows 0.1 Ohms (the minimum resolution of my multimeter is 0.1 Ohms).

                  There is also a through-hole resistor near the rails that is very odd... I haven't seen a resistor with 2 gold bands in the 3rd and 4th position (photo attached). The value read with the multimeter is 2.2 Ohms. I guess it is ok.

                  I don't see any other power resistors near the rails.
                  Attached Files

                    Comment

                    • sam_sam_sam
                      Badcaps Legend
                      • Jul 2011
                      • 6037
                      • USA
                      #6
                      Re: Xilence 1200W. Keeps restarting

                      Did you replace the capacitors around the power supply regulator ic chip you can not check with a ohm meter you need to check them with an ESR meter

                        Comment

                        • victorcas
                          Member
                          • Oct 2021
                          • 12
                          • España
                          #7
                          Re: Xilence 1200W. Keeps restarting

                          After some tests the power supply stopped working definitely. I checked the board again and noticed that 3 resistors were broken (R62, R74, R25), so I replaced them with 4.7 Ohm resistors (I didn't have SMD resistors of that size).After that, when I plugged in the power supply and turned it on, I heard a clicking sound and nothing .... After that, when I plugged in the power supply and turned it on, I heard a clicking sound and nothing .... I have not heard that clicking sound again.

                          I checked the diodes again but I don't see anything bad. I'm about to give up on this one.... I'm starting to think this PSU has more than one thing broken. I'm not sure if I broke something while checking it, but I don't think so.....

                          Originally posted by sam_sam_sam
                          Did you replace the capacitors around the power supply regulator ic chip you can not check with a ohm meter you need to check them with an ESR meter
                          Yes, I replaced the 3 capacitors (I used nichicon). I checked them with an ESR multimeter. I use the Amprobe AM-570 which can measure capacitance.

                          PD: Sorry for the late reply. This is my hobby and I can only work on it during the weekend.
                          Attached Files

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