Dell XPS L702x Quanta GM7C, brak detekcji zasilacza.

Witam.
Dell XPS L702x
Płyta DAGM7CMBAE1 REV:E

Nie rozpoznaje zasilacza - w BIOSie AC Adapter: unknown. Brak mi już pomysłów. Dwa sprawne zasilacze podmienione, gniazdo dla pewności tez.
Wymienione PQ50 I PQ51, PD7, sprawdzone wartości rezystorów PR167, PR168, PR169, PR170, PR171 - wszystkie wartości zgodne ze schematem.
Podmieniony KBC IT8518E przejście do KBC na n87 jest, podmieniony ISL88731A.
Nie mam oscyloskopu do dyspozycji.

Measure the voltages on pins 21, 26, 73, 80, 81, 87 of KBC.
Measure the voltages on pin 125 of the KBC in the following cases:
at the power off
with pressed power on
to the power on.

Pin of KBC:
21- 3,24V
26 - 3,33V
73, 80, 81 - 0V
87 -2,27V

pin 125:
at the power off - 3,3V
with pressed power on - 0,19V
to the power on - 3,3V

Have you tried with a genuine Dell power supply?
If so, measure the voltages to ground on pins of transistor PQ25.

I tried two original Dell power supplies. In another laptop they are well recognized.



PQ25:
at the power off pin 2 - 5V; pin 3- 0V
at the power on pin 2- 0V; pin3 -13,48V

matic napisał(a):measure the voltages to ground on pins of transistor PQ25.

Sorry, I looked at the wrong schematic.
If I have the correct schematic now it should be transistor PQ51.

Replace the bios and remember to save the old one.

Pin of KBC:
73, 80, 81 - 0V

If these pins remain at 0v change the KBC.