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

It is currently 12 January 2025, 06:29

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

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
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#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).
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