Acer Aspire a715 - no power, 10ohm resistor keeps blowing on VCC

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  • agent0bean
    New Member
    • Oct 2021
    • 5
    • Philippines

    #1

    Acer Aspire a715 - no power, 10ohm resistor keeps blowing on VCC

    I got Acer Aspire A715-42G, no 19v going through the DC-IN mosfet. I also checked the components/power rails downstream and no short detected (gpu and cpu rails are at 2-10 ohms)
    I have checked that there's no gate voltage on the DC-IN mosfet, so I checked if PUB1 has power.
    Turns out there's no 19v going into PUB1 VCC caused by a burnt 10 ohm resistor (PRB12 - 19v stops here).
    Replaced the part but it burned when I plugged in the charger - telling me there's something pulling high current.
    I checked the resistance of PCB16 and it was fine.

    I measured the resistance from VCC to ground and measured 4 ohms (PRB12 and PCB16 removed) - other pins of PUB1 had 10ohms and above.
    I think the 4 ohms VCC to ground is too low for this chip (BQ24781) - need your inputs if this is normal or need to look elsewhere.

    Link to the schematic: https://www.badcaps.net/filedata/fetch?id=2097110
    Link to boardview: https://www.badcaps.net/filedata/fetch?id=2097111

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