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820-3115 PP5V_S3 0v

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  • 820-3115 PP5V_S3 0v


    820-3115 liquid damage (to usual thunderbolt area and SYS_CLK area).
    Green light solid after some work.

    When AC power applied fan spins for 3 seconds then goes off then repeats


    PPBUS_G3_H 12.56v
    ISNSx2 12.6v
    PP3V3_S5 3.4v

    PP5V_S3 0v
    PP5V_S3 diode mode to ground 0.130v (same as donor)


    U7200 pin 20/21 0v (occasionally jumps a volt or two)
    pin 3 1.9v
    pin 1 jumps between 0 and 1.9v
    pin 22 4.57v
    pin 16 12.56v

    replaced U7200, no change.
    PM_SLP_S4_L 3.3v when fan spinning then off.

    Any ideas please ?

  • #2
    Clock chip dead.

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