Dell latitude 5591 not power on

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  • lapfix
    Badcaps Legend
    • Mar 2020
    • 2764
    • my workshop
    #21
    unfortunately I don't have an oscilloscope.
    the only thing I've tried is to measure if there's a voltage.
    1v on one side and 0.400v on the other.
    I believe that all the voltages required by the io are present, so why doesn't it generate the 2 voltages of VBUS2_ECOK and VBUS1_ECOK !
    Note that with my power supply, consumption remains invariant at 0.027 amp...and whether with an original or type-c charger, the 2 VBUS_ECOK voltages are not released.

    Note also that there's no indication that a power supply exist, especially the power supply LED.

    PU901 : ISL9538
    pin 3 = +PWR_SRC =12.60v
    pin 8 = VDDP =5v
    pin 16 = ADP v=19v
    pin 17 = DCIN =19v
    pi 18 = VDD =5v
    pin 19 = ACIN =3.5v
    pin 24 = ACOK =3v

    when battery connected
    PR917 = 12.60v
    BUT PQ906 :
    S=12.60
    G=12.60 even battery is not connected (it must be 3v) so he's always on OFF state
    D=0.288v

    So all the in of all others circuits has a 12.60v ( 3V_VIN/5V_VIN/+1.2V_DDR_B+/+1VALWP_B+/CPU_B+1...etc) and i think that's normal because PQ4 (= +SDC_IN) is acting as a diode body and not a mosfet.
    ​

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