Acer Aspire S7-391 Wistron Storm 12223 48.4WE05.011 brak reakcji

Acer Aspire S7-391
Plyta: Wistron Storm 12223 48.4WE05.011
CPU: i5-3337U
PCH: SLJ8C
KBC: IT8518VG FXS

Laptop nie reaguje na przycisk power (chociaż raz samoistnie się uruchomił). Ładuje baterię.
Przy podłączonej baterii na cewce PL4101 pojawia się 1.29V (a powinno tu być 3.3V 3D3V_PWR).
Napiecia VREG3 i VREG5 obecne
PU4103:
pin3 = 3,30V
pin13 = 5,01V

KBC oraz kość SPI dla KBC (U6001) są prawidłowo zasilane.

Po odpięciu baterii PL4101 = 0V. Dziwi mnie to 1,29V które się tam pojawia.

Proszę o pomoc w dalszej diagnozie płyty.

Open PG4104, PG4105 and measure the resistance and voltage on the 2 pads

PG4104, PG4105:
Choke side = 15kΩ, 0V (AC only); 0V (AC+BAT connected)
Q3607 side = 30kΩ, 0.04V (AC only); 2.11V (AC+BAT connected)

poster писал(а):PU4103:
pin3 = 3,30V
pin13 = 5,01V

An also PWR_3D3V_EN and PWR_5V_EN are present.
Pin 6 = 3.30V
Pin20 = 3.30V

Measure the voltages to ground on pins 1, 5, 7, 9, 14, 17 of chip PU4103 with the jumpers PG4104, PG4105 opened.

PU4103 = TI51275 with the jumpers PG4104, PG4105 opened:
1 = 0.48V
5= 0.74V
7 = 0V
9 = 5.64V
14 = 0V
17 = 4.83V

Replace the chip PU4103 (TPS51275RUKR).

Chip replaced.
PU4103 (AC only, PG4104, PG4105 opened):
1 = 0.48V
3 = 3.29V
5= 0.70V
6 = 3.28V
7 = 0V
9 = 5.34V
13 = 5.01V
14 = 0V
17 = 4.81V
20 = 3.28V

Measure the following voltages to ground with the jumpers PG4104, PG4105 opened:
- On pin 12 of chip PU4103.
- On pin 4 of transistors PU4101, PU4105.

pin 12 of chip PU4103 = 19.47V
PU4101 pin4 = 19,47V
PU4105 pin4 = 19,47V

Please, post a clear picture of chip PU4103 area of the board with a nearby surroundings.

Check the resistors PR4103 (39.2kΩ), PR4107 (57.6kΩ), PR4106, PR4108 (both 2.2Ω).

Found PR4108 damaged. After soldering new one, board works.

Thanks alot!