HP 250 G3 LA-A994P rev. 2.0 3/5V problem.

Got this notebook as dead, no reaction on power button.
After changing PU301 notebook worked. But only 2 hours.
IC was not new, so i ordered new, replaced PU301 again, have it powered on for 5 hours.
Gave it back to customer and it died again.
There are no signs of liquid or mechanical damage.

Any idea what can cause such a weird problem?
TIA Matus

PU301 warms up?
Measure the resistance to ground of PL302, PL303.

does not warms up.
PL303 15 kOhm, PL302 7 kOhm.
Today i soldered new IC and it did not powered up. I have 3,3V on pin 13 of PU301 after pressing power on. Have changed all 4 tranzistors.
3VL and 5VL are pressent.

Now im not sure if PU301 was problem at all. 2 times changing it worked, now not.

Measure the resistance to ground on all coils.
Original power supply?

Only close to short are PLZ2 11 Ohm and PLG1 10 Ohms, but thats CPU power, maybe its OK?
Power suply used is universal, but used original too with same results.
Thank you

The resistors on the CPU supply coils are fine.
Measure the voltages on all coils.

Zero everywhere, only PL102 have some voltage, with battery, its 12,5, battery charge.

Measure the voltages on pins 6, 9, 75, 84, 95, 100, 106, 110, 116, 124 of KBC.
Measure the voltages on pin 114 of the KBC in the following cases:
at the power off
with pressed power on
to the power on.

6-0
9-3,3
75-0,35
84-0
95-0
100-0
106-0
110-3,3
116-0
124-1,78
114 have 3,2 then 0 then 3,2

ADP_ID is too low, i could not find why, changing KBC did not helped.
Time for repair runned out, thank you for help.