• Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

It is currently 13 January 2026, 15:34

Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

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#1 Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by bratapita • 13 January 2026, 12:29
Laptop Acer Nitro A515-52-507R, płyta DH5VF LA-F952P.
Brak zwarć i zaniżonych oporności. Startuje B+ oraz 5V a po naciśnięciu przycisku power pojawia się 3,3V na przetwornicy i na kości BIOS.
Zasilany jest PCH (1V) i KBC (3,3V) - widać w podczerwieni. Po kilku sek. zasilanie zanika.
Bateria RTC po podłączeniu do płyty wykazuje spadek z 3V do 0,8V. Rezystancja 1,8 MΩ na pinach na płycie. Na zworce JCMOS1 jest 0,99kΩ .
Brak napieć na RAM, CPU i7 i VGA GTX 1050. BIOS oczywiście robiłem.
Podejrzewam uszkodzenie PCH lub KBC ale jak ustalić dokładnie?
Jakie pomiary mogę jeszcze wykonać aby to ustalić dokładnie?

Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by Google Adsense [BOT] • 13 January 2026, 12:29

#2 Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by matic • 13 January 2026, 12:46
Hello!

Measure the resistance to ground on pin 1 of diode DH2 with the RTC battery disconnected from the board.
Diode DH2 pinout:
Image

#3 Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by bratapita • 13 January 2026, 13:07
Zmierzyłem i jest 20kΩ

#4 Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by matic • 13 January 2026, 13:26
Set the laboratory power supply to 3V and limit the current to 1A. Connect it to the pin 1 of diode DH2. What electrical current flows from the laboratory power supply during the test?

#5 Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by bratapita • 13 January 2026, 14:17
Nic nie płynie, żaden prąd.

#6 Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by matic • 13 January 2026, 14:53
Replace the resistor RH104 with a value 1kΩ and connect a functional RTC battery to the board.
Then measure the voltage directly across the resistor RH104 (do not measure the voltage in reference to ground, but between both pins of this resistor).

Re: Płyta Acer Nitro model LA-F952P nie startuje, spadek napiecia na baterii RTC.

by Google Adsense [BOT] • 13 January 2026, 14:53
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