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[SOLVED]820-3115-B PPBUS_G3H up and down

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  • [SOLVED]820-3115-B PPBUS_G3H up and down

    Hello everybody

    I m working on 820-3115 not power up PPBUS_G3H voltage is up to 14.4v 2 second later down 4.8V or 5V .

    Magsafe green led is ok
    PP3V42 is stable
    Removed F7040 nothing changed
    R7020 voltage is 16.6V and stable
    Replaced U7000,Q7030,Q7035 nothing changed
    CHGR_UGATE voltage is up and down
    When i measured U7000 around resistors all is fine..
    Also checked R7020,21 and R7051,52 they are ok
    When i injected 12.5V PPBUs_g3h fan spins,

    What can i do next step?

  • #2
    Measure on pins 17/18 and 27/28 of ISL6259, corroded trace in the sense circuits are common.

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    • #3
      Duke problem fixed after when cable jump to 17/18 line to R7050 ..

      Thanks too much again

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