• ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

It is currently 19 May 2025, 16:55

ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

 Forum rules: Click here to view the forum rules

  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
  3. Before posting a new topic please read all topics in TRAININGS subforum and make a preliminary diagnostic based on the content of those trainings.
  4. Uploading of any complete schematics, BIOS / firmware files or any other kind of documentation, or linking to 3rd party websites with such files, is STRICTLY PROHIBITED. You can only upload the small portion of documentation or, link to BIOS file on UNVERIFIED BIOS FILES subforum, which simplifies the diagnostics/repair. You are not allowed to upload more then one complete page of instruction/schematic per single topic. The file you upload must not contain any watermarks, "confidential" markings, links or email addresses and cannot be password-protected.
  5. It is only permitted to describe one faulty device per single topic - you should always open a new topic for each subsequent device.
  6. Requesting of the full schematics, BoardView files, BIOS files or any other kind of documentation is NOT ALLOWED in this subforum. If you need to ask for any of these, you should open a new topic in DOCUMENTATION/BIOS REQUEST subforum.

#1 ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by Brucie • 14 May 2025, 16:55
Witam

Płyta NM-C771 REV 1.0

Laptop nie ładuje się i nie włącza. Napięcie na baterii 0V. Napięcie z ładowarki 5.3V, nie zmienia się na 20V, testowane na dwóch ładowarkach.
Kilka pomiarów:
+VBUS_CONN1: 5.3V
BATT+: 0V
V9B+: 0V
VSYSTEM2_L/VSYSTEM2: 0V
USBC0_CC1: 2.7V
USBC0_CC2: 1.9V
Po podłączeniu ładowarki odwrotnie napięcia na USBC0_CC1 i USBC0_CC2 zamieniają się miejscami.
+LDO_3V3: 3.2V
SNK_PS_EN: 3.2V
SNK_PS_ACK: 3.2V
+5VALW: 0V

Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by Google Adsense [BOT] • 14 May 2025, 16:55

#2 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by matic • 15 May 2025, 08:30
Brucie wrote:Napięcie z ładowarki 5.3V
Hello!
What electrical current flows from the power supply?

Measure the resistances to ground on the following components:
- On any pin of resistors PR109, PR118.
- On coil PL4,
- On jumper PJ2.

- Measure the voltages to ground on pins 31 of chip UT2.

#3 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by Brucie • 15 May 2025, 12:51
Current measured at J10: 60mA and after 1s constant 4,5mA
UT2 pin 31 - 5,28V

Resistances (negative probe to ground):
PR109, PR118 - readings go up to hundreds of kOhms
PL4 - 1,3M
PJ2 - readings go up to 200k and keeps slowly going up

#4 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by matic • 15 May 2025, 14:07
Set your multimeter to the diode test mode and measure the voltage drops to ground on listed pins with the positive (red) probe connected to ground:
- On both pins of capacitors CT25, CT26, CT27, CT29, CT32, CT33, CT34, CT35.
- On pins 1, 4 of coil LT7.

#5 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by Brucie • 16 May 2025, 10:16
CT25 - no voltage drop/0,348V
CT26 - no voltage drop/0,348V
CT27 - no voltage drop/0,348V
CT29 - no voltage drop/0,348V
CT32 - no voltage drop/0,348V
CT33 - no voltage drop/0,348V
CT34 - no voltage drop/0,348V
CT35 - no voltage drop/0,348V
LT7 - pin 1 - 0,555V, pin 4 - 0,555V

#6 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by matic • 16 May 2025, 10:59
Replace the USB Type-C controller chip UT2. Note that this chip requires programming.

#7 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by Brucie • 16 May 2025, 11:22
matic wrote:Note that this chip requires programming.

How to program this chip?

#8 Re: ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania/nie włącza się

by matic • 16 May 2025, 23:06
You need a suitable programmer, for example Svod 4 or Vertyanov successor v3 and of course a dump for this chip.

Another option is to buy a pre-programmed chip, or "pull" it from the same donor board.

Similar Topics
  ThinkPad E15 GEN 2 NM-C771 REV 1.0 brak ładowania  [SOLVED]
Lenovo ThinkPad E15 gen 2 (NM-D011) - Nie włącza się
Schemat Lenovo ThinkPad E 14 Gen 5 E 16 Gen 1 AMD LCFC KE452/KE612 NM-F351
[BIOS DUMP REQUEST] ThinkPad T15 Gen 2 (NM-D351 Rev. : 1.0) - Failed to recover ME Firmware
  Lenovo ThinkPad P50 | BP500, NM-A451, VER 1.0 - nie włącza się
Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

Who is online

Users browsing this forum: No registered users and 4 guests

_______________________________
All rights reserved. Unauthorised copying of this website's content or any of its part is strictly forbidden.
Any trademarks, brand names, products or services published on this website belong to their legal owners, are copyrighted and used for information purposes only.