• Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

It is currently 12 January 2025, 10:39

Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

 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.
 This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).

#1 Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

by inventco • 23 March 2024, 13:11
Witam.
Płyta : NM-A711 rev1.0
Charger BQ24780
KBC it8586E
PCH SR2C4
CPU SR2FQ
GPU n16P-GX-A2

Laptop nie odpala prąd pulsuje 0 - 20mA co mniej więcej 05 - 1s
Zwarty był PQ201
I laptop nie pobierał w ogóle prądu.
Po wymianie laptop pobiera pulsowo prąd
Zwarcie S i D w PQ202 powoduje, że laptop pobiera 30mA i rozpoczyna po chwili procedurę startu i działa do momentu odłaczenia zasilania.

HELP :D

okazuje się , że sam się w głupi błąd wprowadziłem.... na zasilaczu serwisowym pulsuje jak podpiąłem zasilacz oryginał z innego lenovo płyta działa poprawnie....
co ciekawe rezystor pomiarowy zmieniałem i 4,7k i 1,5k i 1k i nic to nie dało...
ma ktoś pewny patent na zasilacz serwisowy (wtyk serwisowy)...

Re: Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

by Google Adsense [BOT] • 23 March 2024, 13:11

#3 Re: Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

by inventco • 24 March 2024, 11:44
When Laptop works there are proper voltages.
On oscilloscope i see only pulses from BQ corresponding to those pulses transistor answers voltage on "exit" i mean that when pulse is on the gate on transistor output there is pulse too... this pulse is 20V....

But when i connect original lenovo charger no pulses... only stable 20V on mainboard... also stable gate signal from bq....

there is trouble with detection of my modified plug (i use for testing regulated supply with resistor to gnd) and i believe that resistor is wrong.

2 original chargers laptop works proper on my testing bench cant boot.

Re: Lenovo NM-A711 ,CY420/CY510 - pulsuje nie odpala

by Google Adsense [BOT] • 25 March 2024, 11:39
 This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).
Similar Topics
Lenovo ThinkPad E15 MB:JE442/JE542 Rev 1.0 NM-E211 Nie uruchamia się, nie ładuje bat
MSI MGP B550 Gaming Plus - płyta nie odpala, dioda CPU Debug ciągle świeci
  Lenovo G50-80 NM-A361 nie włącza się  [SOLVED]
  Lenovo Legion 5 15IMH05 NM-C921 - nie ładuje baterii  [SOLVED]
Lenovo E15, płyta NM-D011 - nie uruchamia się
Lenovo A475 NM-B351 Rev 1.0 Nie uruchamia się

Who is online

Users browsing this forum: No registered users and 5 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.