• Acer Nitro5, płyta LA-J891P. Brak napięcia CMSRC

It is currently 8 April 2025, 11:14

 [SOLVED] Acer Nitro5, płyta LA-J891P. Brak napięcia CMSRC

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#1 Acer Nitro5, płyta LA-J891P. Brak napięcia CMSRC  [SOLVED]

by matrixmm • 14 November 2024, 17:23
Cześć,
Mam na stole laptopa Acer Nitro 5 AN515-55, LA-J891P Rev: 1B, charger BQ24781.
Nie mogę sobie z nim poradzić.
Charger jest zasilany (VCC - 18,7V) , jest generowany 6V REGN, ACDET jest w stanie wysokim
(dokładnie 2.5V). ACOK prawidłowo 3,25V. Ale brakuje 19V CMSRC (CMSRC 0V 44,8kΩ), więc również ACDRV i mosfety (PQB11 i PQB12) nie są załączane. Mosfet pomierzyłem i wyglądają na sprawne.
Mógłby ktoś napisać coś więcej o tym pinie (CMSRC)? Co musi się wydarzyć żeby było napięcie (z datasheetu wyczytałem, że VVCC_UVLOZ < VVCC < ACOVP i VACDET > 2.4 V więc chyba spełniam te warunki) , co może powodować problem i co ew. sprawdzić?
Cherger wymieniłem na nowy i bez zmian. Poniżej pomiary:

PUB1
3 - 0V 44,8k
5 - 3,25V
6 - 2,5V
28 - 18,7V

PQB11
1,2,3 - 1,85MΩ
4 - 1,87MΩ
5,6,7,8 - 242kΩ

PQB12
1,2,3 - 1,85MΩ
4 - 1,73MΩ
5,6,7,8 - 60kΩ

Jak zawsze będę wdzięczny za wszelką pomoc.

Edit.
Przelutowałem jeszcze raz mosfety PQB11 i PQB12 i CMSRC się pojawiło. :) Przepraszam za zamieszanie.

Re: Acer Nitro5, płyta LA-J891P. Brak napięcia CMSRC  [SOLVED]

by Google Adsense [BOT] • 14 November 2024, 17:23
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