• Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V

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#1 Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by daro19862 27 October 2025, 22:41
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.

Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by Google Adsense [BOT] 27 October 2025, 22:41

#2 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by matic 28 October 2025, 14:17
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.

#3 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by daro19862 28 October 2025, 15:14
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

#4 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by matic 28 October 2025, 15:59
daro19862 wrote: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.

#5 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by daro19862 28 October 2025, 20:43
When revered polarity i got more than 1k like mega ohm

#6 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by matic 29 October 2025, 10:07
daro19862 wrote: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?

#7 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by daro19862 29 October 2025, 14:54
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

#8 Re: Lenovo Lenovo ThinkPad X1 Carbon - nie przełącza na 20V


by daro19862 1 November 2025, 11:48
Any idea ?

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