Dell Laptop Inspiron 13 5379 shuts down at start up

[tttleaders]

Anyone here specialized in Dell Laptop Inspiron 13 5379 ?

I'm working on a laptop that when powered on , shuts down after 5 seconds and repeats this each time it's powered up. You can hear the HD spinning until the lap shuts down. The fan doesn't spin at all. VCC_CORE , +VCCGT , + VCCSA remain 0V and PWM's at pin 4 PU4701, PU4702 , PU4801 (NCP81382) is 2.0V (Mid state) for 5 seconds at power on and drop to 0V and PWM at pin 2 PU5001 (NCP81253) remains 0V. What I noticed is that CPU pin E32 line which is VCC_SENSE connected to pin 47 from PU4601 (NCP81218) measures 3.5R to GND and if I split the line the short remains at CPU side. Can I conclude that CPU has a short ? Need to figure this out because a new mb is about $350. Thank you.

Numbers on motherboard :
DP/N
00KJ0J
cn-00kj0j-wsc00-7aj-12bc-a00
MO : 28852572 Ver : 1C
P/N : 4550CF010003

[Techtiger]

Re: Dell Laptop Inspiron 13 5379 shuts down at start up

up-lode the schematic & check all coils resistance to GND , 3/5ALWS & 3/5VS voltages are OK or not ?

[tttleaders]

Re: Dell Laptop Inspiron 13 5379 shuts down at start up

up-lode the schematic & check all coils resistance to GND , 3/5ALWS & 3/5VS voltages are OK or not ?

Thank you for your reply.
All voltages measure good except to those I mentioned.
In the uploaded file you can see the comments and measurements done.

[Techtiger]

Re: Dell Laptop Inspiron 13 5379 shuts down at start up

Good work on the comments and measurements , what is the resistance to GND on 3D3V_S0 5V_S0 line ? check all coils resistance to GND example PL5001 ect

[tttleaders]

Re: Dell Laptop Inspiron 13 5379 shuts down at start up

Thank you for the compliments. Why I didn't bother to measure the impedance to GND is because 3D3V_S0 and 5V_S0 and other measured lines are up and precise for 5 seconds and if there is a short on them they would shut down within 1 or 2 sec.
However VCC_CORE , +VCCGT and +VCCSA measure about 3 Ohms to GND.
My question would be...Why does VCC_SENSE connected to pin 47 from PU4601 (NCP81218) measures 3.5R to GND, while if I compare it with the other 2 sense lines (VCCGT_SENSE and VCCSA_SENSE, which measure about 2.1K with diode test. I'm not familiar with this laptop but shouldn't the fan be spinning ?
What else can be the problem, that prevents PU4601 (1x2x1 PWM NCP81218) from driving the power fets.