Sfx 380watt failed mod

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  • bearjumpjump
    Member
    • Jul 2024
    • 13
    • Indonesia
    #1

    Sfx 380watt failed mod

    So I try to modify this cheapo sfx power supply
    I change it's

    - main cap configuration to parallel rubycon 150uf 450v two pair

    -diode bridge in one package form with heatsink

    - add input inductor, X & Y cap

    But it won't start anymore lol

    5v sb is Okey

    Sc1605 got all of its voltage

    I got 320dc on main cap

    I got 14dc on output of middle small transformer (d9 those 1n4148)

    Secondary diodes is good (two pair mbr1645, f1620)

    Primary trannies is good (two 13700b)

    Power management ic is me8117 i don't know if it's good lol


    Please help me guys
    I really appreciate it

    Thank you




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    • bearjumpjump
      Member
      • Jul 2024
      • 13
      • Indonesia
      #2
      When power supply switch on
      Optopcoupler
      Pin 1 4.98v
      Pin 2 3.9v
      Pin 3 1.16v
      Pin 4 hot ground


      Ic power management
      Me8117
      Pin 1 no reading
      Pun 2 6.45v
      Pin 3 no reading (connected to pin3 Opto)
      Pin4 no reading (connected to pin4 Opto)
      Pin5 no reading
      Pin6 cut leg/no connection
      Pin7&8 1v (connected same winding on small transformer)
      The other end winding read 324v


      First npn13007

      B = no reading
      C = 325v
      E = no reading (connected to collector's second 13007)

      Second npn13007

      B= no reading
      C= no reading or fluctuate sometimes
      E= no reading

      Main big transformer 0v on all pin whatsoever

      12v pad after inductor reading 2v
      Other rails is 0volt lol




      I already change all of 1n4148 diodes

        Comment

        • bearjumpjump
          Member
          • Jul 2024
          • 13
          • Indonesia
          #3
          1 Photo

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