Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V

Po podłączeniu pod USV-C zasilacz nie przełącza na 20V na obu gniazdach.
Płyta główna NM-D961
W jednym porcie USB-C napięcie 5V skacze w drugim porcie jest stabline.

Hello!

- Measure the resistances directly on the capacitors C3094, C3098, C3234.

Set your multimeter to the diode test mode and measure the voltage drops to ground on the following points:
- On pin 2 of capacitors C3095, C3097, C3100, C3599.
- On pad 2 on the pace of resistors R3617, R3618, R11068, R11069.

C3094- 1,2k Ω
C3098- 4k Ω
C3234- 300 Ω

C3095 - 0,486V
C3097- 0,486V
C3100- 0,600V
C3599- 0,609V

empty slot not have resistor
R3617- p.1 0,486V and p.2 0,689V
R3618- p.1 0,486V and p.2 0,688V
R11068- p1 0,690V and p.2 0.609V
R11069- p.1 0.688 and p.2 0.602V

daro19862 писал(а):C3234- 300 Ω

Remeasure this resistance with the revered polarity of test leads.
If you still get the resistance less than 1kΩ, remove the diode D437 from the board and check the resistance again.

When revered polarity i got more than 1k like mega ohm

daro19862 писал(а):W jednym porcie USB-C napięcie 5V skacze

At which port exactly does the voltage fluctuates and in what range?
What power consumption does the meter show?

Connector J1702
Power consumption is jump 10mA-20mA
F43-5,1V
F56-5.1V
VINT20_IN - jump 3,8V-5,1V

Connector J59
Power consumption is stop at 260mA orange led above port is on
F42-5,1V
F45-5,1V
VINT20_IN - 5,1V

Any idea ?

Measure the resistances between listed pins:
- Between the fuse F42 and pin 2 of capacitor C3032.
- Between the fuse F43 and pin 2 of capacitor C3032.

- Between the fuse F42 and pin 2 of capacitor C3032- jump 116k Ω to 3M Ω
- Between the fuse F43 and pin 2 of capacitor C3032 - 9 Ω
Q263 bad ? desolder ?

daro19862 писал(а):Between the fuse F43 and pin 2 of capacitor C3032 - 9 Ω
Q263 bad ? desolder ?

Wylutuj Q263 i ponów ten pomiar - jeśli rezystancja wzrośnie znacząco, to Q263 ma wewnętrzne zwarcie i jest do wymiany.

Po wymianie Q263 laptop działa prawidłowo.