PSU AT Delta DPS-200-PB-8 half voltage.

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  • Franchute13
    New Member
    • Jul 2018
    • 4
    • Ahi

    #1

    PSU AT Delta DPS-200-PB-8 half voltage.

    HI!.

    I want to repair this AT PSU.
    Sometimes it works well for a few minutes. Other times it does not start well.
    When it fails, the voltages fall almost in half.
    + 12v -> +5,5v
    + 5V -> +2.8v
    When it fails, the PG goes crazy and falls to 0V.
    I was already measuring the capacitors and they seem to be all right.
    Any suggestions that may be failing?

    Greetings and thanks.
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9535
    • Canada

    #2
    Re: PSU AT Delta DPS-200-PB-8 half voltage.

    I would replace any small electrolytic caps in the primary (0.47-47µf around 50V), I don't know how you measured the caps but those usually cause problems and are over looked.
    Last edited by R_J; 07-17-2018, 11:02 AM.

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    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8133
      • Canada

      #3
      Re: PSU AT Delta DPS-200-PB-8 half voltage.

      sounds like a problem I ran before on a different PSU. There was a small cap near a heat sink that was bad in the feedback circuit.

      Comment

      • Franchute13
        New Member
        • Jul 2018
        • 4
        • Ahi

        #4
        Re: PSU AT Delta DPS-200-PB-8 half voltage.

        Hi.

        Thanks for answering. This weekend I am going to change the small capacitors of the primary.
        Attached image of the power source.

        Greetings.
        Attached Files

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8133
          • Canada

          #5
          Re: PSU AT Delta DPS-200-PB-8 half voltage.

          Check the small caps in the secondary too. The feedback starts at the secondary.

          Comment

          • Franchute13
            New Member
            • Jul 2018
            • 4
            • Ahi

            #6
            Re: PSU AT Delta DPS-200-PB-8 half voltage.

            Hello!

            Change all the electrolytic and the problem persists.
            Any other component to check? what do you think?

            regards
            Last edited by Franchute13; 07-19-2018, 06:15 PM.

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