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820-2519 no power/green light. Acok low

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  • 820-2519 no power/green light. Acok low

    HI,
    No power or green light on 820-2915. No liquid on board. ACOK is low.

    PPBUS - 12.25V
    PP3V42 - 3.483V
    ACOK - .037V
    ACOK in Diode - .470
    pin 27/28 - 20OH
    pin 17/18 -3 Ohm

    Already changed ISL6259

  • #2
    ACIN value?
    Do you get corect 3V42?

    Comment


    • #3
      Acin = 3.930v
      pp3v42 = 3.483v

      Comment


      • #4
        Remove U6901 and check again SMC_BC_ACOK voltage.

        Comment


        • #5
          Hi.
          ACOK still 0.37V after U6901 removed.

          Comment


          • #6
            Check R5087; you can force it to 100K...

            Comment


            • #7
              Getting 115K from R5087.

              Thats supposed to be a 470K resistor...


              Thanks.

              Comment


              • #8
                4.97K on pin 1 of R5087. Short on SMC side?

                Comment


                • #9
                  Try to reflow SMC with good flux...
                  If doesn't help, remove it; don't forget to check ACOK before resolder other SMC.

                  Comment

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