• Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

It is currently 14 December 2024, 01:43

Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

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#1 Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by praktykant1 • 30 September 2024, 15:48
Dzień dobry,

laptop z przebitym do VIN mosfetem PQZ2.
Uszkodzony CPU został wymieniony na nowy.
Brak napięć na +VCC_CORE.

Wyczyszczony me region, flash kbc.
Profilaktycznie wymieniony NCP81215P na nowy.

Napięcia na PUZ1:
Image

Napięcia na płycie głównej:

Image

Proszę o pomoc

PS: Oferuję 200zł za pomoc w rozwiązaniu usterki.

Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by Google Adsense [BOT] • 30 September 2024, 15:48

#2 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by matic • 18 October 2024, 13:27
Hello!

Measure the voltages to ground on listed pins:
- On jumper PJM3.
- On pin 2 of resistors PRH7, PRH8, PRZ3, PRZ15.
- On pin 4 of chip UC3.
- On pins 21, 32, 100 of KBC chip.

#3 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by praktykant1 • 26 November 2024, 17:14
- On jumper PJM3 - 0,59V
- On pin 2 of resistors PRH7 - 0.94V, PRH8 - 0V, PRZ3 - 0V - , PRZ15 - 1V.
- On pin 4 of chip UC3 - 3.2V.
- On pins 21 - 3.3V, 32 - 3.3V, 100 - 3.3V of KBC chip.

PRH8 is connested to GND
PRZ3 - 100OHM to GND

#4 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by matic • 27 November 2024, 14:01
- Measure the resistance to ground on pin 2 of resistor PRZ12.
- Measure the voltages to ground on both pins of resistor PRZ12.

#5 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by praktykant1 • 28 November 2024, 15:47
matic wrote:- Measure the resistance to ground on pin 2 of resistor PRZ12. - 1.7kohm
- Measure the voltages to ground on both pins of resistor PRZ12.
pin1 - 1.03V, pin2 - 1.05V

#6 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by matic • 2 December 2024, 09:54
There is one of three possibilities:
- Your voltage measurement on pin 52 of chip PUZ1 is wrong.
- There is bad solder joint on pin 52 of chip PUZ1.
- The copper trace on the PCB between resistor PRZ12 and pin 52 of chip PUZ1 is broken.

#7 Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by praktykant1 • 2 December 2024, 13:57
Once in 10 starts there is no voltage on pin52. I checked all pins again and all measurements are correct except for pin 52 which is currently at 1V.

Re: Acer Predator PH315-53-71HN Brak obrazu po wymianie CPU GH51M LA-K862P Rev:1A

by Google Adsense [BOT] • 2 December 2024, 13:57
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