HP Pavilion 15-cs3018nw mb: DAG7BLMB8D0, brak reakcji

Witam szanowne grono. Na stole HP Pavilion 15-cs3018nw mb: DAG7BLMB8D0 rev:D. Notebook po lekkim zalaniu - dotarł już po czyszczeniu przez inny serwis.Zalanie w okolicy zaznaczonej kółkiem. Laptop nie reaguje na przycisk power on. Nie świeci się dioda przy gnieździe zasilania. Na cewce obok gniazda akumulatora 0,15V - na pozostałych 0V. Rezystancja cewek do masy na zdjęciu. Na przycisku power on 0,25V spada do 0 po wciśnięciu. Podejrzewam przetwornicę 3,3 / 5V - czy te napięcia powinny być w tym modelu widoczne od razu ?

Hello!

Please, specify the markings on highlighted two chips (picture below) or post a clear pictures with visible markings on both chips.

Thank you for your response
The upper circuit is AWVBUE, probably SY8286BRAC. The bottom one has the inscription: BACBUE

Measure the voltage to ground on pin 5 of chip "AWVBUE".

matic napisał(a):Measure the voltage to ground on pin 5 of chip "AWVBUE".

pin 5 - 20V

- Measure the voltages to ground on pins 1, 9, 11, 12, 14, 17 of chip "AWVBUE".
- Measure the voltages to ground on pins 1, 9, 11, 12, 14, 15, 17 of chip "BACBUE".

matic napisał(a):- Measure the voltages to ground on pins 1, 9, 11, 12, 14, 17 of chip "AWVBUE".
- Measure the voltages to ground on pins 1, 9, 11, 12, 14, 15, 17 of chip "BACBUE".

AWVBUE : 1 - 2,9V, 9-0V, 11-4,6V, 12-0V, 14-0v, 17-3,3V
BACBUE: 1-0V, 9-0V, 11-0V, 12-0V, 14-0V, 15-0,05V, 17-0V

edit: I cleaned the pins of the second chip and corrected the measurements.

BACBUE: 1-2,8V, 9-0V, 11-3,9V, 12-0V, 14-0V, 15-5V, 17-3,35V

The diode next to the power outlet started blinking steadily.
She blinked for a moment and stopped. I resolder both chips, however, the voltage again to BACBUE 0V

BACBUE: 1-0V, 9-0V, 11-0V, 12-0V, 14-0V, 15-0,05V, 17-0V

pawel1978 napisał(a):I resolder both chips, however, the voltage again to BACBUE 0V

- Is 3V still present on pin 17 of chip "AWVBUE" after the resoldering?
- Measure the resistance between pin 11 of chip "AWVBUE" and pin 11 of chip "BACBUE".
- Are you sure the chip "BACBUE" is soldered correctly now?

matic napisał(a):

pawel1978 napisał(a):I resolder both chips, however, the voltage again to BACBUE 0V

- Is 3V still present on pin 17 of chip "AWVBUE" after the resoldering?
- Measure the resistance between pin 11 of chip "AWVBUE" and pin 11 of chip "BACBUE".
- Are you sure the chip "BACBUE" is soldered correctly now?

1: yes - on 17 pin AWVBUE - 3,3V
2. resistance between pin 11 of chip "AWVBUE" and pin 11 of chip "BACBUE - is 274k
3. all legs look ok ...

Please, post a clear picture of highlighted area of the board.

What value should this resistor have? It looks damaged.

The capacitors C1, C2, C3, C4 seems corroded as well.
Use a continuity tester ans check which of resistors marked as R1, R2 is connected to the ground.

matic napisał(a):The capacitors C1, C2, C3, C4 seems corroded as well.
Use a continuity tester ans check which of resistors marked as R1, R2 is connected to the ground.
[ Obrazek ]

Resistor R2 is connected to the ground (from the bottom). Resistor R1 after desoldering has no resistance - there is a break.

R1= 499kΩ/1%, package 0402
R2= 150kΩ/1%, package 0402

C1= 10µF/25V, package 0805
C2= 10µF/25V, package 0805
C3= 100nF/25V, package 0402
C4= 2,2nF/50V, package 0402

matic napisał(a):R1= 499kΩ/1%, package 0402
R2= 150kΩ/1%, package 0402

C1= 10µF/25V, package 0805
C2= 10µF/25V, package 0805
C3= 100nF/25V, package 0402
C4= 2,2nF/50V, package 0402

After replacing R1, there is a slight progress. As I wrote earlier, the LED next to the power socket started to light -4 seconds, it goes out for 1 second and so on. MB still does not respond to the switch. The switch has a voltage of 0.25V.

I have replaced R2, C1, C2 and C4 as a preventive measure. C3 I had to leave the old ones because I missed the size when ordering. Unfortunately, the mb continues to behave as just after replacing the damaged R1

Remeasure all voltages suggested in post #6.

matic napisał(a):Remeasure all voltages suggested in post #6.

AWVBUE : 1 - 2,9V, 9-0V, 11-4,6V, 12-0V, 14-0v, 17-3,3V
BACBUE: 1 - 2,78V, 9-0V, 11 - 4,6V, 12-0V, 14-0V, 15 - 5V, 17-3,35V ( I measure the voltage of the leg 17 on the capacitor below .. I can not get to the coil side)

Carefully inspect the entire board for more corrosion/spill residues.

matic napisał(a):Carefully inspect the entire board for more corrosion/spill residues.

It seems the flooding was actually only in this area. Notebook delivered after another service, already washed / The diode from the first photo seems to be moved, in the second photo there are 3 more capacitors suspected. I could use a boardview fragment - otherwise it's searching in the dark