General troubleshooting flowchart for PSU's

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  • fuxxy
    Badcaps Veteran
    • Jan 2013
    • 318
    • USA
    #1

    General troubleshooting flowchart for PSU's

    Hi guys,

    I'm just getting into repairing PSU's - I know a couple pins need to be jumpered to "turn on" the PSU, and switching PSU's need a load attached to not mess up when powered.

    Is there a general flowchart to determine how the PSU powers itself up? At the very least, some order in which to test in order to determine where to look?
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31003
      • Albion
      #2
      Re: General troubleshooting flowchart for PSU's

      step1: open it for a visual check - it may save you from smoke/flames!
      (that goes for fixing anything)

      step2 - does the 5v standby work?
      because wihout that - you cant turn it on no matter how many wires you connect together!

        Comment

        • fuxxy
          Badcaps Veteran
          • Jan 2013
          • 318
          • USA
          #3
          Re: General troubleshooting flowchart for PSU's

          So that's a good start - Visual check, then +5V standby before anything

            Comment

            • fuxxy
              Badcaps Veteran
              • Jan 2013
              • 318
              • USA
              #4
              Re: General troubleshooting flowchart for PSU's

              What happens if I have +5V standby and the PSU doesnt power on when PS_ON is jumpered?

                Comment

                • everell
                  Badcaps Legend
                  • Jan 2009
                  • 1514
                  • USA
                  #5
                  Re: General troubleshooting flowchart for PSU's

                  Include in your visual check.............to look at the red switch on the back of the power supply (some power supplies don't have one but most do). I just got a dead power supply from a shop.......the red switch was in the 230 volt position. Here in the United States we run with 115 volts AC. So........of course the power supply would not turn on. This kind of problem can often be solved by simply changing the switch position from 230 volts to 115 volts.

                  If you live in a country that runs on 230 volts, a power supply with the switch in the 115 volt position will probably smoke, spark, and create quite a show.
                  Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 31003
                      • Albion
                      #6
                      Re: General troubleshooting flowchart for PSU's

                      it takes out the motherboard - i know someone it happened to.

                        Comment

                        • elraymonds
                          New Member
                          • May 2014
                          • 1
                          • United Kingdom
                          #7
                          Re: General troubleshooting flowchart for PSU's

                          About the flowchart, you can check the creately diagramming community for some answers. use an example and start drawing with the flowchart software.

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