Thinkpad L480 , Power On ONLY without CMOS Battery

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  • juergenb
    Member
    • Jan 2018
    • 42
    • Germany

    #1

    Thinkpad L480 , Power On ONLY without CMOS Battery

    Hi,

    i have a second L480 that had some Liquid Damage (USB-C and Ports on left). The LCD has Coffee on the left side (barely visible).

    It had some Coffee spilled, the notebook was in a bag, when the thermos leaked.

    The book was fine for a while and still worked, so i used this a reference when measuring voltages.
    The book powered on with Power Button and was fine.

    Next day i wanted to continue to repair, but didn´t realise that i had a short with the meter test leads.

    Ground from Meter was connected to Board GND.
    Positive from Meter was shorted to Board GND.

    During Measuring of Voltage on the Thinkpad, i measured
    PJ101 and PJ203
    .

    After a few second i realized, that i shorted PJ101 and PJ203 to Ground during my measurement. I had some Sparks touching the PJ101/PJ203

    I think

    PJ101 VSystem2 to GND was no Problem (19V to GND)
    PJ203 to GND seamed to have fried some parts.

    The Thinkpad only Powers On if i disconnect the CMOS Battery.
    CMOS Battery a 3V.

    Where would i start now?
    I have Schematics and Boardview.

    Assume the USB-C Port missing, where would i inject 19V direct on the board?

    Thanks

    Jürgen
    Last edited by juergenb; 04-10-2022, 11:27 AM. Reason: changed title

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