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820-00840 (Q7900 Failure) Now missing P5S4_EN

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  • 820-00840 (Q7900 Failure) Now missing P5S4_EN

    Well the good news is that it was Q7900 that was shorted and not Q8060. Maybe the CPU survived.
    I checked all the CPU power rails resistance against my two answer keys "working boards" and they were similar.

    After replacing Q7900 I now have PPBUS_G3H back.
    However I am missing my P5S4_EN at U7650

    Once I get into U7800 I am pretty much lost.
    This is not a water damaged board. Initial failure was Q7900 so I am guessing I have a PCH problem here!

    PMIC_SHUTDOWN_L 3.3v
    PP3V1 _RTC 3.1V
    SMC_LRESET_L 0.0v
    PM_SYSRST_L 3.3v
    S5_PWRGD 3.2v

    I am really kind of lost here.

    RTC_RESET_L 3.1v
    SYSCLK_CLK32_PCH "nice square wave"
    PCH_SUSACK_L 3.2

    yea... I am lost

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