ATP-1655 mosfet equivalents

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  • seanc
    Badcaps Legend
    • Nov 2008
    • 1319
    #1

    ATP-1655 mosfet equivalents

    I have one of he above power supplies from an ASUS Terminator PC.

    A Mitsubishi FS7KM mosfet has popped in it - I suspect either due to conductive glue syndrome or because of the bad Teapo in it.

    I've scraped the remaining brown glue away.

    On hand, I have a 2SK2843 which seems to exceed the specifications of the FS7KM, it does have a lower RDS ON though. Will it work?

    At my disposal I also have: STPS20100CT or FCF10A60.

    Cheers!
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    • everell
      Badcaps Legend
      • Jan 2009
      • 1514
      • USA
      #2
      Re: ATP-1655 mosfet equivalents

      I am not familiar with this particular power supply. Some pictures would help.

      The STPS20100CT and FCF10A60 are dual rectifiers, so they will definitely not substitute for the FS7KM. The 2SK2843 might work - might not. Is the FS7LM FET that blew in the 5vsb circuit or is it the main switching transistor, or perhaps one of two main switching transistors. Need more information please.
      Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

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        • seanc
          Badcaps Legend
          • Nov 2008
          • 1319
          #3
          Re: ATP-1655 mosfet equivalents

          Pictures attached

          The 5VSB purple wire is over the other side of the board near the 3 Nichion caps, so I'd guess it's not part of that circuit.

          Seeing as it's next to the primary capacitors and a 2.2uf 50v cap, I would say it's in the primary section.
          Attached Files

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            • seanc
              Badcaps Legend
              • Nov 2008
              • 1319
              #4
              Re: ATP-1655 mosfet equivalents

              I just fixed this.

              I took the suspicious FS7KM out and examined it - it wasn't damaged, it was just well cooked glue. Scraped the glue off and it tested fine. Put it back in - still no go.

              I dug around scraping the glue off of the rest of the board and found a lone mosfet I'd missed earlier, hiding under the 5v wires. It was all covered i brown glue.
              Took it out, cleaned off the crusty glue and corrosion - put it back in and it's working

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