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3437 VSS PRAM Block is Messed Up

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  • 3437 VSS PRAM Block is Messed Up

    Quarter Fan Spin in Loop

    PPBUS_G3H: 8.59V
    PP3V42: 3.401V
    PPRTC_G3H: 3.310V
    PP5V_S5: 4.994V
    PP3V_S5: 3.310V
    S4 to S0 rails, Pin 3 of U1950 pulsing

    SMC_ADAPTER_EN : 3.366V
    PM_BATLOW_L : 3.305V
    PM_DSW_PWRGD: 3.398V
    SMC_PM_G2_EN: 3.396V

    Checked all SPI Bus Series Termination traces and resistors
    Put flux and heated SMC and SPI

    When I connect the Medusa it displays "VSS PRAM Block is Messed Up"
    Replaced U6100 and tried without reprogramming and cleaning anything: Board Starts S0 state OK but No Chime and backlight/Display
    Write Spi Rom, cleaned ME region, Fixed Fsys Crc Serial, cleaned Pram: still showing same Pram missed up message and fan is not Spining.
    When I connect the Medusa to the board, it starts.

    Did you ever seen this message on the medusa?


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