Smoke from amacrox ax400-s

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  • Quaddro
    Tukang Kentu
    • Nov 2010
    • 141
    • Indonesia
    #1

    Smoke from amacrox ax400-s

    Yesterday my friend give me a psu, and he said it's broken.
    amacrox type ax400-s. oem fsp.

    so i try to fix it.

    first i connect this psu with light bulb method, and i found the 100w lamp is turn on so bright. of couse, there's short in primary section.

    so i open it, and replace the apfc mosfet (rated 13n50) with my spare components (18n50).
    checking surround components, and there's no short.

    then i check again with my bulb lamp..still turn on so bright...

    after a few inspection, i've decide to replace the apfc module xxx-60GLY with cm6800g, got it from another working fsp psu.

    okay, right now everything is okay, the light bulb not turn on..
    but wtf, there's smokes...

    it came from around dash 2 b-5 transformer..
    Okay, then i replace it again with same transformer from working psu..

    still smokes came around that area..(circle area in my picture)

    checking components and there's no short..

    any ideas..?

    # sorry for my bad english
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    • Per Hansson
      Super Moderator
      • Jul 2005
      • 5895
      • Sweden
      #2
      Re: Smoke from amacrox ax400-s

      Check all diodes which are in the areas you have circled.
      And the 5VSB controller chip (DM311?) itself.
      The big bulk capacitor looks suspect too.

      Also this PSU looks similar or identical to the FSPXXX-60GLN series.
      So have a look at this thread: https://www.badcaps.net/forum/showthread.php?t=37356
      "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • momaka
          master hoarder
          • May 2008
          • 12170
          • Bulgaria
          #3
          Re: Smoke from amacrox ax400-s

          I agree with Per - that big CapXon cap on the primary is not to be trusted, especially with APFC duty. If you want to leave it in there for now, then disable the APFC (i.e. remove APFC MOSFET or disconnect its gate from CM6800 IC and pull MOSFET gate to ground). Then see if 5 VSB comes up. If you still see smoke from the same area, the 5 VSB PWM-FET IC might be gone, along with other components around it.
          Last edited by momaka; 10-09-2015, 09:38 PM.

            Comment

            • Quaddro
              Tukang Kentu
              • Nov 2010
              • 141
              • Indonesia
              #4
              Re: Smoke from amacrox ax400-s

              @Per Hansson and momoka

              Thanks for response.
              i've already check all components in circle area and there's no short.
              (smd zener, smd transistor, smd diode, and smd caps)
              Well, at least with my analogue multimeter there's no short.

              5vsb controller using dm0865r.
              okay, i'll try to replace the bulk caps & do like mr. momaka suggest..

                Comment

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