Lenovo ThinkPad E590 Płyta NM-B911 rev:1.0 - nie uruchamia się.

Piny 23 oraz 32 mają tylko 0.1v

Check your solder joints on all pins of chip PU101.

Po dokładnym ponownym przelutowaniu PU101 sytuacja bez zmian.

Measure the resistances between listed pins of transistors PQ101, PQ102:
a) Between pin 1 and pin 4.
b) Between pin 1 and pin 9.
c) Between pin 4 and pin 9.
d) Between pin 5 and pin 8.
e) Between pin 5 and pin 9.
f) Between pin 8 and pin 9.

Measure the resistances between listed pins of transistor PQ103:
a) Between pin 1 and pin 4.
b) Between pin 1 and pin 5.
c) Between pin 4 and pin 5.

Transistor PQ101 pinout:

Transistor PQ102 pinout:

Measure the resistances between listed pins of transistors

PQ101:
a) Between pin 1 and pin 4 - 320 Kohm
b) Between pin 1 and pin 9 - 1.25 Kohm
c) Between pin 4 and pin 9 - 300 Kohm
d) Between pin 5 and pin 8 - 108 Kohm
e) Between pin 5 and pin 9 - 330 Kohm
f) Between pin 8 and pin 9 - 220 Kohm

PQ102:
a) Between pin 1 and pin 4 - 1 Mohm
b) Between pin 1 and pin 9 - 1.4 Kohm
c) Between pin 4 and pin 9 - 9 Kohm
d) Between pin 5 and pin 8 - 1.3 Kohm
e) Between pin 5 and pin 9 - 600 ohm
f) Between pin 8 and pin 9 - 32 Kohm

PQ103:
a) Between pin 1 and pin 4 - 80 Kohm
b) Between pin 1 and pin 5 - 60 Kohm
c) Between pin 4 and pin 5 - 10 Mohm

HotIce писал(а):PQ102:
e) Between pin 5 and pin 9 - 600 ohm

This resistance seems too low.
Remove the transistor PQ102 from the board and remeasure this resistance on the transistor itself (removed from the board) and also on the place of this transistor on the board (without transistor).

Po wylutowaniu PQ102 miejsce pod nim miedzy pinami 5-9 ma 7 Kohm, a wylutowany tranzystor 600 Ohm.

The transistor PQ102 is definitely damaged and needs to be replaced.

Po wymianie PQ102 na nowy nic się nie zmieniło, dalej brak napięcia na wszystkich cewkach. Zastanawiam się czy ten tranzystor jest rzeczywiście wadliwy, ma tą oporność 600 Ohm ale po odwróceniu sond multimetru jest już 1 Mohm a na nowym tranzystorze AON6998 jest podobnie, na pinach 5-9 jest 400 Ohm a po odwróceniu sond jest 220 Kohm. Pomiary na wylutowanych tranzystorach.