dell 15341 no power

[doctormasry]

hi friends
i va laptop dell 15341
motherboard id : vegas/turis skl/kbl 15341-1
the proplem no power
no 3.3 v on bios or pin 1 press power
i check pu4503
pin 12 = 19v vin
pin 3 = 3.3 v vreg3
pin 13 = 5v vreg 5
pin 7 = 0v pgood
pin 20 = 0v en1
pin 6 = 0v en2

i check kbc24
no volt on all vcc pin

i changed pu4503 put same measure no new

any idea

[mon2]

What is the voltage to ground of RTC_AUX_S5 @ Vbat pin 122 on KBC24 (EC)? This pin should be ~3v since the source of this voltage is 3D3V_AUX_S5 <- 3D3V_PWR_2 = VREG3 (pin 3 on PU4503).

Remove all power. Meter in resistance mode.

Measure the resistance to ground of:

3D3V_PWR ; @ PL4502

5V_PWR ; @ PL4501

[mcplslg123]

ACAV_IN present on pin 128 of SIO?

[doctormasry]

ACAV_IN present on pin 128 of SIO?

thanks mcplslg123
ACAV_IN = 3.3V

[doctormasry]

What is the voltage to ground of RTC_AUX_S5 @ Vbat pin 122 on KBC24 (EC)? This pin should be ~3v since the source of this voltage is 3D3V_AUX_S5 <- 3D3V_PWR_2 = VREG3 (pin 3 on PU4503).

Remove all power. Meter in resistance mode.

Measure the resistance to ground of:

3D3V_PWR ; @ PL4502

5V_PWR ; @ PL4501

thanks mon2
VBATT PIN 122 = 0 VOLT AND ITS SHORT

VREG3 (pin 3 on PU4503). = 3.3V

PL4501 = SHORT
PL4502 = 850 oh

[mon2]

Remove all power. Meter in resistance mode. What is the exact resistance to ground of PL4501? Being 5v, this issue may very well be linked to a defective USB loadswitch since the USB ports use 5v for VBUS.