• Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu

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#1 Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by krisark 6 February 2025, 16:45
Witam wszystkich,
Lenovo Legio 5 15ARH05, płyta NM-D041 Rev: 1.0
Laptop po delikatnym zalaniu, zalana była przetwornica PU2001 (RT6585CGQW).
Przetwornica została wylutowana, wyczyszczone pady i wlutowana ponownie.
Laptop odpalił się sam 2x z auto startu i sam się wyłączał. Z przycisku Power SW5 nie dało się go włączyć.
Teraz już się nie uruchamia sam.
Przeprogramowany BIOS i KBC, bez zmian.
Na SW5 jest za niskie napięcie 1,22V. przycisk sprawny.
KBC:
pin 110 - 1,22V

PU2001 rezystancja i napięcia:
pin 3 - 43,65kΩ / 3,30V
pin 13 - 540,00kΩ / 5,14V

pin 8 - 4,78kΩ / 3,34V
pin 18 - 42,78kΩ / 5,13V

Image

Proszę o pomoc w ustaleniu usterki.

Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


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#3 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by krisark 7 February 2025, 10:06
Machine wrote:Check RI111 = 100k ( )
94,50kΩ
Machine wrote:Measure the voltages on all pins of RI111.

pin 1 - 1,23V
pin 2 - 3,29V
Machine wrote:Measure voltage and resistance on pins of DI1.

pin 1 - 1,22V / 44,20kΩ
pin 2 - 0,00V / 0,60Ω

#4 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by matic 7 February 2025, 12:05
Lift pin 110 of the KBC chip and remeasure the voltage to ground on pin 1 of resistor RI111. If the voltage rises to 3V, the KBC chip is damaged and needs to be replaced.

#5 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by krisark 7 February 2025, 14:20
matic wrote:Lift pin 110 of the KBC chip and remeasure the voltage to ground on pin 1 of resistor RI111
Poniosłem pin 110 KBC do góry, ale napięcie na RI111 pin 1 jest nadal 1,22V.

EDIT:
Usunąłem diodę DI1, trochę wzrosło RI111 pin 1 jest teraz 1,79V.
Na samej podniesionej nodze KBC pin 110 jest 2,45V.

#6 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by matic 9 February 2025, 21:40
Are the diode DI15 and capacitor CE18 present on your board?
If not, open (cut) the jumper RI119 and remeasure the voltages to ground on both pins of resistor RI111, with pin 110 of the KBC chip raised.

#7 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by krisark 10 February 2025, 10:30
matic wrote:Are the diode DI15 and capacitor CE18 present on your board?
DI15 - brak
CE18 - brak
matic wrote:If not, open (cut) the jumper RI119 and remeasure the voltages to ground on both pins of resistor RI111, with pin 110 of the KBC chip raised.
RI111:
pin 1 - 3,26V
pin 2 - 3,30V

#8 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu  [SOLVED]


by matic 10 February 2025, 11:15
The power button SW5 is very likely damaged and has too low leakage resistance in the released position. Remove the SW5 from the board, close the jumper RI119 and remeasure the voltage.

#9 Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by krisark 10 February 2025, 14:40
matic wrote:The power button SW5 is very likely damaged and has too low leakage resistance in the released position. Remove the SW5 from the board, close the jumper RI119 and remeasure the voltage.
Przycisk usięty, jest teraz prawidłowo.
RI111:
pin 1 - 3,28V
pin 2 - 3,31V

Przylutowałem pin 110 - KBC - napięcie jest 3,26V na tym pinie.
SW5:
pin 1, 3 - 3,26V

Zwierając SW5 do masy, aby zasymulować start nic się nie dzieje, płyta nie rusza.
Może ten KBC jest też uszkodzony, nie mogę się z nim połączyć, cały czas komunikat KBC jest zajęty.
Pobór prądowy cały czas stoi na 0,013A.

EDIT:
Usunąłem KBC z płyty i wykasowałem wsad w podstawce, po założeniu zaprogramował się sam i płyta dała obraz.
Zakładam nowy przycisk.
Dzięki Matic za pomoc.

Re: Lenovo 15ARH05, płyta NM-D041 - po małym zalaniu


by Google Adsense [BOT] 10 February 2025, 14:40

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