ACER Aspire 5 A515 - nie uruchamia się

Witam.
Płyta LA-K091P. Nie uruchamia się tj. nie są otwierane wejściowe MOSFETY (PQB3 i PGB4).
Na płycie nie zauważyłem żadnych zwarć więc testowo zmostkowałem PQB3 i PGB4 i okazało się, że płyta reaguje na przycisk włączenia, jest obraz, można ją wyłączyć z przycisku.
PQB3, PQB4 i PUB1 wydawały się w porządku, ale profilaktycznie je wymieniłem, ale sytuacja jest identyczna. Tranzystor PQB2 wydaje się w porządku jak i PQB5 i PQB6.
Napięcia na PUB1 (BQ24800, pomiary z USUNIĘTYM mostkiem PQB3/PQB4):
- p. 5 : 3,3V (ACOK),
- p. 6: 2,6V (ACDET),
- p. 10: 0V (/PROCHOT),
- p. 24: 6V (REGN).
Proszę o pomoc w namierzeniu problemu.

Hello!

Measure the voltages to ground on all pins of battery connector with the power supply + battery connected.

Voltages on PJP201 (battery + power supply):
- p. 1-5: 0V,
- p. 6: 2,5V (with RTC battery connected: 0V),
- p. 7/8: 0V.

Resistance to ground on PJP201:
- p. 3: 10kΩ,
- p. 4: 10kΩ,
- p. 5: 20kΩ,
- p. 7/8: >2MΩ.


I noticed the charger tries to open the main MOSFETs, there are three attempts which last about 0,5 sek.
In addition I provide the resistance and voltages on charger (PUB1 BQ24800):
PUB1:
1. 500kΩ,
2. 5MΩ,
3. 3,8MΩ,
4. 3,8MΩ,
5. 11k,/3,3V
6. 63k,/2,6V
7. 11,5kΩ,
8. 193kΩ,
9. x,
10.1kΩ,
11.52kΩ,
12.52kΩ,
13.gnd,
14.x,
15.25kΩ,
16.x,
17.7MΩ,
18.>50MΩ
19.6MΩ,
20.6MΩ,
21.65kΩ,
22.gnd,
23.194kΩ,
24.21k,/6V,
25.18M,/5,7V,
26.6MΩ,
27.6MΩ,
28.5MΩ/19V.

Bridge pin 6 of the battery connector to ground and remeasure the voltage to ground on pin 8 of the battery connector with the power supply + battery connected.

When I short pin 6 to ground nothing happens (no changes, no voltages), pins 7/8=0V.
This is the same situation as in this case:

p. 6: 2,5V (with RTC battery connected: 0V)

so PQ201 works fine.
I have completely no idea what is wrong. The mainboard works when I short PQB3 & PGB4.
I forgot to provide voltages on PQB3 & PGB4:
PGB3 (no shorts to ground and between pins):
- p. 1-3: 0V,
- p. 4: 0V,
- p .5: 19V.
PGB4 (no shorts to ground and between pins):
- p. 1-5: 0V.

After short input MOSFETs (only MB with RAM, no HDD and no LCD):
- the current is 19,9mA (supply voltage 19,0V),
- voltage on PRB3 between pins 1/2-3/4 0,19mV.
After presing power button:
- the current is 940mA,
- voltage on PRB3 9,4mV.

Measure the resistances between listed pins:
a) Between pin 1 and pin 2 of charger chip PUB1.
b) Between pin 17 and pin 27 of charger chip PUB1.
c) Between pin 19 and pin 20 of charger chip PUB1.
d) Between pin 19 and pin 27 of charger chip PUB1.
e) Between pin 1 of charger chip PUB1 and pin 5 of transistor PQB4.
f) Between pin 3 of charger chip PUB1 and pin 1 of transistor PQB3.
g) Between pin 4 of charger chip PUB1 and pin 4 of transistor PQB3.
h) Between pin 18 of charger chip PUB1 and pin 4 of transistor PQB2.

Measurments (the resistance of the meter's measuring probes is about 0.1Ω when I short them):
p. 1-2: 2,5Ω (Is it not to much?),
p.17-27: 10Ω,
p.19-20: 20Ω,
p.19-27: 10Ω,

p.1-5: 1,2Ω (PUB1-PQB4; Is it not to much?),
p.3-1: 4,01kΩ (PUB1-PQB3),
p.4-4:4,02kΩ (PUB1-PQB3),
p.18-4:4,02Ωl (PUB1-PQB2).