Fan siezed, PFC burnt in CFT-620-A12S

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  • pdavid
    Badcaps Veteran
    • Jan 2011
    • 279
    • Hungary
    #1

    Fan siezed, PFC burnt in CFT-620-A12S

    Hi!

    I got this psu that seemed to be a quick fix at first. Turned out that the fan bearing got stuck and all the caps plus the PFC boost coil got boiled. The guts come from Sirtec. It's an old build, but looks decent enough. Looks far better than any gutless unit today...

    The main trafo and secondary torroids, pi coils seem good, but the active pfc is way too damaged for safe operation.
    Does anyone might have info about the core material? Looks like it was green/black originaly.
    I have a lot of spares or I can just wind one, that matches the diameters and windings and inductance. Might just build in one and see if it fits to the specs...
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    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: Fan siezed, PFC burnt in CFT-620-A12S

      Does the coil have 0 ohms across the two legs ? If so its good lol its only a filter.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Fan siezed, PFC burnt in CFT-620-A12S

          Originally posted by ReeceyBurger123
          Does the coil have 0 ohms across the two legs ? If so its good lol its only a filter.
          a) that's not just a filter, it's an active PFC inductor

          b) no...just no...an inductor is more than just zero ohms between a pair of legs
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • ReeceyBurger123
              Never Give Up !
              • May 2014
              • 7325
              • Britain
              #4
              Re: Fan siezed, PFC burnt in CFT-620-A12S

              Whoops my bad guess I got mixed up again lol
              Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

              https://www.facebook.com/Telford-Tel...7894576335359/

                Comment

                • pdavid
                  Badcaps Veteran
                  • Jan 2011
                  • 279
                  • Hungary
                  #5
                  Re: Fan siezed, PFC burnt in CFT-620-A12S

                  Coil measures 0.3, 0.4 ohms. The enamel is burned off some areas and it could get shorted. The toroid core is beyond repair too. I got plenty if spare coils suitable for APFC boosting, some new some from similar apfc topology psus.

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 31163
                      • Albion
                      #6
                      Re: Fan siezed, PFC burnt in CFT-620-A12S

                      why not download a datasheet for the pfc controller?
                      most have example circuits with component details.

                        Comment

                        • pdavid
                          Badcaps Veteran
                          • Jan 2011
                          • 279
                          • Hungary
                          #7
                          Re: Fan siezed, PFC burnt in CFT-620-A12S

                          It's just a cm6800 in the primary. I guess any 400-600uH coil, with thick enough wire, will do for this max wattage.

                            Comment

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