• Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

It is currently 14 December 2024, 07:02

Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

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#1 Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by krisark • 25 January 2024, 10:53
Witam wszystkich,
Lenovo YOGA 530-14ARR 81H9, płyta NM-B781 Rev: 1.0
Laptop się uruchamia oraz ładuje baterie, ale nie wyświetla obrazu, wszystkie zasilania są poprawne oprócz zasilania na cewce PL1903 powinno być (1.2V), a jest 0,70V.
BIOS naprawiony.
KBC podmieniony, ale laptop uruchamia się tylko na oryginalnym wsadzie wyciągniętym z KBC, nie uruchamia się również na wsadzie wygenerowanym z BIOS :o

Czy coś mogę jeszcze sprawdzić przed wymianą układu PU1901.
Z góry dziękuję za odpowiedź.

Re: Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by Google Adsense [BOT] • 25 January 2024, 10:53

#3 Re: Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by krisark • 25 January 2024, 20:37
Machine wrote:Measure the voltages on pins 31, 36 , 38, 40 of PU1901.
PU1901:
pin 31 - 3,35V
pin 36 - 3,34V
pin 38 - 0,70V
pin 40 - 0,26V

#4 Re: Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by krisark • 29 January 2024, 09:07
Wymieniłem na nowy PU1901 - LV5028RPC ale brak poprawy, zasilanie na cewce PL1903 dalej 0,70V.
Ma może ktoś jakiś pomysł?

#6 Re: Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by krisark • 29 January 2024, 10:38
Machine wrote:Measure the resistance to ground of PL1903.
PL1903:
293,00Ω - z kością RAM
578,00Ω - bez kości RAM

Re: Lenovo YOGA 530, płyta NM-B781 - 0,70V na zasilaniu RAM

by Google Adsense [BOT] • 29 January 2024, 10:38
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