Dell latitude 5591 not power on

[lapfix]

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.