• HP Envy 17 - brak 5V

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HP Envy 17 - brak 5V

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#1 HP Envy 17 - brak 5V

by Arni • 9 March 2025, 02:18
HP Envy 17
płyta: day31amb6c0 rev c

Witam.
W laptopie nie zauważałem napięcia 5V na PL20.
Co najciekawsze na układzie PU12 brak napięcie EN. Niby proste tylko nie wiem skąd ten układ powinien dostać to napięcie na EN.
Sprawdziłem schemat i wychodzi, że z 128 wyjścia układu IT8987. Problem w tym że układ IT8987 na pin 11 ma brak 3.3V, ale nie jest przywarty. :frustry:
Wydaje się jakby napięcie miało się pojawić (rośnie do 0.8V) i nagle przestaje wchodzić na układ IT8987 .
Wygląda jakby brak napięcia 5V to zatrzymało. Tylko teraz mamy pętle, której nie rozumiem :shock:

Re: HP Envy 17 - brak 5V

by Google Adsense [BOT] • 9 March 2025, 02:18

#2 Re: HP Envy 17 - brak 5V

by matic • 9 March 2025, 19:35
Arni wrote:Problem w tym że układ IT8987 na pin 11 ma brak 3.3V, ale nie jest przywarty.
Hello!
This voltage is generated by the power distribution switch PU8 (pins 13, 14).

Arni wrote:Wydaje się jakby napięcie miało się pojawić (rośnie do 0.8V) i nagle przestaje
The reason is probably the missing 5V "bias voltage" on pin 4 of the chip PU8.

- Check if 5V LDO voltage is present on the capacitor PC205.
- Open the jumper PJP3 and check if 5V appears on the coil PL20.

Re: HP Envy 17 - brak 5V

by Google Adsense [BOT] • 9 March 2025, 19:35
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