HP ProBook 445 G7 no POST only on battery

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  • someonenotyou
    Senior Member
    • Feb 2021
    • 51
    • LV
    #1

    HP ProBook 445 G7 no POST only on battery

    Hi.
    I have a strange problem with HP ProBook 445 G7 (DA0X9MMB8F0 RevF), that there is no POST while only on battery. The Caps Lock blinks 5 times slowly.
    When I attach DC Jack, the laptop will charge the battery and switch on.

    And now the strange part:

    1. While the Windows is still loading, and I will remove the DC Jack, the screen goes blank and the Caps Lock light will start blinking 5 times slowly.
    2. When Windows has been loaded and on desktop, when I unplug DC Jack, it will work normally on battery. While still on battery mode I switch the laptop off, it will show Shutting Down, and then blank screen and Caps Lock starts blinking 5 times slowly without turning off.

    I have flashed a different BIOS and EC, but still it does not boot on battery.
    Is the EC chip faulty?

    Thank you.
    Tags: None
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