Powerman resurrected

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  • everell
    Badcaps Legend
    • Jan 2009
    • 1514
    • USA
    #1

    Powerman resurrected

    This is a Powerman model IW-P250A2-0 which had a "blasted" 5vsb circuit. Both switching transistors black and broken, along with a few other parts. I made an attempt at replacing bad parts and powered up. Blasted the transistors again, along with a few other parts, and damaged the 5vsb transformer, one winding open and one winding shorted.

    I wasn't able to find an exact replacement transformer, but used a transformer from a Fortron psu which had a badly burned pc board. I constructed a 5vsb circuit on breadboard using the DM311 IC rather than the 2 transistor design. 5vsb came up at 5.02 volts. Power supply came up running fine, all output voltages look good.

    Photos attached. It may look "strange" but it now works just fine.
    Attached Files
    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)
    Tags: None
    • Toasty
      Badcaps Legend
      • Jul 2007
      • 4171
      #2
      Re: Powerman resurrected

      So I may remove the note regarding finding the 5VSB transformer, correct?

      I recently began wondering why another trafo would not work, if it came from a similar setup? You have shown that it will. Excellent!
      veritas odium parit

        Comment

        • everell
          Badcaps Legend
          • Jan 2009
          • 1514
          • USA
          #3
          Re: Powerman resurrected

          Yes Toasty - you can remove the note about finding an exact replacement 5vsb transformer. I must say - it was one hell of a modification!!!

          It does show that aside from a severely burned pc board, even a blown 5vsb circuit can be completely replaced - and re-engineered with better circuitry. Even an expensive AT power supply can be given new life with the addition of a 5vsb add-on board.
          Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

            Comment

            • Toasty
              Badcaps Legend
              • Jul 2007
              • 4171
              #4
              Re: Powerman resurrected

              Of course, now one will walk through the door... lol
              veritas odium parit

                Comment

                • everell
                  Badcaps Legend
                  • Jan 2009
                  • 1514
                  • USA
                  #5
                  Re: Powerman resurrected

                  Based on the way it looked when I first got it, and based on the bang the first time I tried to fix it, I would say that a replacement transformer will not come "walking" thru the door..........more like FLYING thru the door!
                  Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                    Comment

                    • everell
                      Badcaps Legend
                      • Jan 2009
                      • 1514
                      • USA
                      #6
                      Re: Powerman resurrected

                      For the more technically minded ....... here is a drawing of the add-on 5vsb replacement circuit.
                      Attached Files
                      Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                        Comment

                        • momaka
                          master hoarder
                          • May 2008
                          • 12170
                          • Bulgaria
                          #7
                          Re: Powerman resurrected

                          Nice work again!
                          You don't seem to run out of those DM311 ICs either (which is a good thing) .

                            Comment

                            • everell
                              Badcaps Legend
                              • Jan 2009
                              • 1514
                              • USA
                              #8
                              Re: Powerman resurrected

                              Cheaper by the dozen
                              Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                                Comment

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