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Quanta N76 power-on issue.

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  • Francisco.s
    Badcaps Veteran
    • Jan 2013
    • 688
    • Spain
    • laptop repair
    #1

    Quanta N76 power-on issue.

    Hello, I'm trying to repair an HP 27 Quanta N76 (DA0N76MB6E0 Rev E).

    I only get 3.3V, 5V, and 1.05V; no other voltages.

    I tried the BIOS and changed the KBC. The KBC self-programmed upon power-up after changing it.

    The VR-On is missing for NCP81220, but 1.2V is also missing for DDR4, so 1P2V_PWRGD is low. SUSON or DDR_VTT_EN are not present on the DDR4 voltage regulator (RT8231BGQW). It seems the KBC isn't triggering these signals.

    I'm using the Quanta N91 schematic, but there are too many changes that make it nearly impossible to measure signal voltages comparing both motherboards.

    If someone knows any other schematic more appropriated, (or the original 😂) it will be great.
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