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Macbook M1 pro 820-02098 no backlight after UP800 (RAA209100B1) replacement

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  • omicronns
    New Member
    • May 2023
    • 2
    • Poland
    #1

    Macbook M1 pro 820-02098 no backlight after UP800 (RAA209100B1) replacement

    Hi,

    I liquid damaged a Macbook, disassembled it and spotted short near UP800. After desoldering it short was gone so I ordered the chip from https://aliexpress.com/item/1005005500396324.html.
    Laptop is turning on, I can see something on the display if I flash strong light at it.
    After replacing the chip, there is still no backlight. I measured components near the chip on both sides of the board again but everything seems fine.
    Next I measured voltages near the chip, there is 5V, 1.2V, also 2.5V on LUXE_C_VDD (seems like it's internally generated by the chip, since only two components connected to that line are the chip and capacitor).
    LUXE_FAULT line has 1.1V not sure if that means that fault was detected or not.
    No voltage is being generated on LP800.

    I noticed that the chip has debug I2C interface. Can something be learned if I would sniff this traffic?
    Any Ideas what could I check next?

    Thanks!
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