Lenovo E15, płyta NM-C421 - Działa na zasilaczu, nie ładuje baterii

Mam zagwozdkę z Lenovo E15. Laptop działa normalnie na zasilaczu, ale nie ładuje baterii. Na samej baterii też nie działa. Bateria jest sprawna, sprawdzałem na innym laptopie. BIOS też zapobiegawczo przeflashowany. Wymieniłem charger na nowy, ale nic to nie zmieniło. Mosfet PQ0201 pozostaje rozwarty. Na source (VSYS15) mam 9V, na bramce też 9V. Na mosfecie żadnego zwarcia nie ma. Bateria w ogóle się nie załącza. Na cewce PL0202 jest 6,9V czyli charger działa. Utknąłem i nie wiem w jakim kierunku teraz iść...

1/ first check PQ0204 dual mosfet upper/lower part for short(as middle contact use PL0202)
2/ PQ0201 AONR21357 is P-Channel MOSFET - so it is open with negative voltage = Gate has to be lower than Source...as you have same voltage on source and gate, mosfet is closed = no battery charging
3/ 6.9V on the PL0202 coil...with charger, without battery?

1/ no shorts on PQ0204
3/ With charger, both with and without the battery connected. and it's 9V, same as on VSYS (my mistake)

I can hardly imagine the mobo is able to work with 9V you are measuring(input from charger is 20V, battery nominal voltage 11V)....check voltages with charger only: VINT20_IN, PL0202, VSYS15

VINT20_IN - 19.8V
PL0202 - 9V
VSYS15 - 9V
it's all the same, both when battery is connected or disconnected. With charger it's just running fine. It's recognizing battery, but there is no charging and battery charge is always 0%. All this is why i'm confused and looking for help.

VINT20_IN - 19.8V ....20V=OK
PL0202 - 9V
VSYS15 - 9V ....VSYS15 name says it should be 15V and you have 9V...this is problem - as I mentioned earlier, battery is probably 11V and to charge it, you need higher voltage than 11V...

so till PQ0204 its OK...PQ0204 is driven by charger PU0201 - check pins 1,6 of PQ0204 with osciloscope, check PU0201 voltages and signal continuity on input side....check resistances PL0202, VSYS15(low resistance=leakage=voltage drop)

Unfortunately, i don't have osciloscope... VBUS on PU0201 is 19.8V, resistances are high. On PQ0204 VBUS is 19.8V but it's remains in the open state. Looks like I finally have to order an oscilloscope.

direction you have to dig in is given - solve problem with low voltage on PQ0204 output (work without battery, till you solve it...charging depends on this)

Measure the voltages on pins 1, 6 of PU0204.

I guess you meant PQ0204, because there is no PU0204.
PIN1 - 12V
PIN6 - 2.3V

found description only for AONX36324 - whitch is N-Channel MOSFET...so it is open with positive voltage = Gate has to be higher than Source..like this is is not working..maybe 9V is leaking from PU0201...I would try desoldering PQ0204 and than check voltages again

Sorry, my mistake. You have made the correct measurement.
Unfortunately, an oscilloscope is needed to certify the operation.