ACER PREDATOR G9-792 - P5NCN/P7NCN REV:2.0 - shuts down under heavy GPU load

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  • ghosteb
    New Member
    • Feb 2023
    • 2
    • Poland
    #1

    ACER PREDATOR G9-792 - P5NCN/P7NCN REV:2.0 - shuts down under heavy GPU load

    Hi,

    Laptop and motherboard as described. When performing a GPU stress test (1080 FHD) or a power test running on battery alone, the laptop shuts down immediately. After about a minute, I can restart the hardware.

    The laptop at the beginning of the repair did not start. I located the burnt capacitor C8050. After replacing the device, it started working. I did some tests and it turned out that during the GPU test on the power supply, the laptop immediately turned off. The power supply was damaged (I replaced it with a new one). Then there was no battery charging: I replaced the BQ24735 chip and the battery (it had 0V). Now there is a problem with the stress test on the GPU when laptop power on battery alone - as I mentioned at the beginning. The laptop works fine on the power adapter. In the meantime, I noticed that after my tests it damaged the C8051 capacitor. I also replaced the mosfets in the charging system: Q8800 (FDS6679AZ), Q8803 and Q8804 (IRF8707PBF).

    I am worried about these damaged capacitors in the +AC_BAT_SYS line. Before the repair, it was obvious that someone had already replaced them (C8051, C8052). Looks like a problem with the power supply.
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