Aspire V3-771 brak zasilania

Model: Acer Aspire V3-771,
Platforma: Pegatron VA70C
Rev: 2.1

Witam,
jak w temacie brak zasilania(0.001A) na Q8800 na nogach 1,2,3 zero zwarcia,bateria nie ładuje po podaniu 19V na nogi 1,2,3 laptop wstaje
Wymieniony BQ24725ARGRR oraz sam Q8800

BQ24725ARGRR
1-0,8V
2-0,8V
3-0,8V
4-0,8V
5-1,2V
6-2,5V
7-0V
8-0,5V
9-0,5V
10-0,7V
11-1,8V
12-1V
13-1V
14-GND 0V
15-0V
16-6V
17-6V
18-1V
19-1V
20-19V

Hello!

Check the transistors Q8802 and Q8806.

Have you replaced the charger chip with exactly the same, as it was the original one (the "A" extension is also important)?

matic ha scritto:Hello!

Check the transistors Q8802 and Q8806.

Have you replaced the charger chip with exactly the same, as it was the original one (the "A" extension is also important)?

Są OK wylutowałem je dalej brak reakcji
BQ24725ARGRR wymieniony z dwóch dawców dokładnie BQ25A

Czy bateria działa w 100%? Zweryfikowano?

nesviasist ha scritto:Czy bateria działa w 100%? Zweryfikowano?

Przepraszam a co ma do tego bateria skoro laptop nie wstaje na zasilaczu i pobór jest 0.001A ?

Measure the resistance between pin 4 of charger chip and pin 2 of transistor Q8802.
Measure the resistance between pin 1 of charger chip and pin 1 of transistor Q8802.

Pin count of Q8802 is according to the Boardview of the board.

matic ha scritto:Measure the resistance between pin 4 of charger chip and pin 2 of transistor Q8802.
Measure the resistance between pin 1 of charger chip and pin 1 of transistor Q8802.

Pin count of Q8802 is according to the Boardview of the board.

Q8802 -1 U8800 -1 0.75Ω
Q8802-2 U8800-4 .7kΩ

Wymieniony U8800 na nowy dalej to samo co mnie zastanawia czy na U8800A P-15 LODRV powinno być 0Ω nawet na wylutowanym Q8805 ?

damian87ew ha scritto:czy na U8800A P-15 LODRV powinno być 0Ω nawet na wylutowanym Q8805 ?

If you mean the resistance to ground on pin 15 of U8800 then definitely not.
If there is a short circuit to ground, the cause may be a solder bridge between pins 14, 15 of U8800, or one of the components - U8800 or Q8805 is damaged.

matic ha scritto:

damian87ew ha scritto:czy na U8800A P-15 LODRV powinno być 0Ω nawet na wylutowanym Q8805 ?

If you mean the resistance to ground on pin 15 of U8800 then definitely not.
If there is a short circuit to ground, the cause may be a solder bridge between pins 14, 15 of U8800, or one of the components - U8800 or Q8805 is damaged.

tak sprawdziłem było mostek pomiędzy 14 a 15 .....brak słów
Q8804 nowy Q8805 nowy dalej to samo... już nie mam punktu zaczepienia
Po podaniu 19V na Q8800 na 1,2,3 nawet bateria jest ładowana

Cześć.
Czy w tej chwili pomiary na BQ są takie same jak w poście #1?

Sprawdź te dwa kondensatory zaznaczone na zdjęciu w razie wątpliwości wymień.

C8803,C8802 wymieniony dalej nic....

BQ24725ARGRR
1-0V
2-0,8V
3-0,8V
4-0,8V
5-1,2V
6-2,6V
7-0V
8-0,5V
9-0,5V
10-0,6V
11-1,9V
12-1V
13-1V
14-GND
15-0V
16-6V
17-6V
18-2,7V
19-1,4V
20-19V

Measure the resistances to ground on pins 15, 18 of BQ24725A.

matic ha scritto:Measure the resistances to ground on pins 15, 18 of BQ24725A.

BQ24725A
Pin 15-160kΩ
Pin-18-1MΩ

Try to replace the transistor Q8802.

matic ha scritto:Try to replace the transistor Q8802.

Podmieniłem z Q8805 bo tam były nowe teraz tylko skacze od 0.01 do 0.04 A dalej nic

Inject 19V from the laboratory power supply to any pin of resistor R8808.
What is the current consumption of the board in this case, when the board is turned off?

matic ha scritto:Inject 19V from the laboratory power supply to any pin of resistor R8808.
What is the current consumption of the board in this case, when the board is turned off?

19V 0,028A
na Q8800 1,2,3 19V 0,008A w spoczynku i płyta normalnie wstaje w stanie ON 19V 1.28A

Measure the resistance between pin 3 of charger chip and pin 1 of transistor Q8800.

matic ha scritto:Measure the resistance between pin 3 of charger chip and pin 1 of transistor Q8800.

10MΩ i rośnie zmierzyłem pomiędzy R8806 PIN-1 i R8808 PIN -1 ponieważ i tak są połączone

Q8800 PIN-1 pomiędzy PIN 3 4.7kΩ