Macbook pro A2779 820-02841-A 5v stuck

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  • fricosu007
    Member
    • Feb 2016
    • 31
    • romania
    #1

    Macbook pro A2779 820-02841-A 5v stuck

    Hello !
    got stuck with a macbook pro a2779 / 820-02841-A having a short on pp5v_s2_main, found the issue, it was the UC260 who got toasted, i replaced if from a donor board, now pp5vs2_sw oscilates between 2v and 4v but never steady on 5v, no more short, could be the u5200 ? I cannot find what ic is making the 5v for S2 rail … power line is at 5v/0.1amp drow, ppvin_p5vs2 is 12v steady … please help !
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14556
      • Canada
      #2
      Remove all power. What is the exact resistance to ground in ohms at pp5vs2_sw?

        Comment

        • fricosu007
          Member
          • Feb 2016
          • 31
          • romania
          #3
          Originally posted by mon2
          Remove all power. What is the exact resistance to ground in ohms at pp5vs2_sw?
          It’s 400kohm and dropping

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14556
              • Canada
              #4
              The resistance is ok.

              What is the exact netname for pp5vs2_sw? This label does not appear in my schematic. Use only the exact name as in the schematics.

                Comment

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