• Huawei Matebook D14 DA0H96MBAF0 REV F martwy

It is currently 14 December 2024, 03:47

Huawei Matebook D14 DA0H96MBAF0 REV F martwy

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#1 Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by altonserwis • 22 December 2023, 15:27
Witam, laptop trafił do mnie martwy. Bez ładowarki /USB-C/.

Po podłączeniu sprawnej ładowarki, HP ale o identycznych parametrach - martwy.

Namierzyłem dwa uszkodzone elementy. Załączam foto.
Po wylutowaniu elementu z wypaloną dziurką / *J 9AB/ nic się nie zmieniło, ale po wylutowaniu układu o oznaczeniu U524 9661M laptop po naciśnięciu włącznika uruchamia jedynie podświetlenie klawiatury, nic więcej. Po wlutowaniu tego układu , podczas naciskania klawisza Power słychać delikatny pisk na płycie.

Będę wdzięczny za pomoc, może fragmenty schematu, identyfikację elementów itp.

Pozdrawiam.

Image

Image

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Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by Google Adsense [BOT] • 22 December 2023, 15:27

#2 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by matic • 1 January 2024, 00:08
altonserwis wrote:Po wylutowaniu elementu z wypaloną dziurką / *J 9AB/ nic się nie zmieniło
Hello!
This component is a USB power switch. I don't know which one exactly according to the markings, but the machine should work normally without it.

altonserwis wrote:po wylutowaniu układu o oznaczeniu U524 9661M laptop po naciśnięciu włącznika uruchamia jedynie podświetlenie klawiatury, nic więcej.
That's a LDO regulator G9661MRE1U. This component is important and must be soldered.
Before soldering the new one, measure the resistance to ground on pad 2 on the place of this chip. If the resistance is high (in kΩ range), solder the new chip.
Datasheet of a similar chip attached.



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#3 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by altonserwis • 2 January 2024, 14:36
Dziękuję za odpowiedź. Niestety pomiędzy 2,3 nogą układu G9661 a masą jest około 8 Ohm.

#4 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by matic • 2 January 2024, 15:49
Measure the values of resistors "A" and "B".
Image

#5 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by altonserwis • 2 January 2024, 15:53
A=B = 28kOhm

Wynika z tego że ma być 1,6V na wyjściu z układu, tak?

#6 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by matic • 2 January 2024, 16:55
altonserwis wrote:A=B = 28kOhm
Are you sure?
Did you measure their resistance outside the board?

#7 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by altonserwis • 3 January 2024, 09:35
Sorry.
A = 41 kOhm
B = 88.5 kOhm

#8 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by matic • 3 January 2024, 10:27
That makes sense now.
Perform a short circuit test on the pads 2, 3 on the place of this chip. Limit the voltage to 2.5V.

#9 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by altonserwis • 3 January 2024, 11:00
Próbowałem. Po podłączeniu 2.5V na pin 2, pobór prądu wynosi 0.25A i nic nie jest ciepłe. Nie posiadam kamery termowizyjnej niestety.

#10 Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by matic • 3 January 2024, 22:38
Leave the power supply connected for some time (~15 minutes) and then check if anything gets a bit warm.
Pay special attention to the APU processor and all RAM chips.

Re: Huawei Matebook D14 DA0H96MBAF0 REV F martwy

by Google Adsense [BOT] • 3 January 2024, 22:38
 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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