Lenovo IdeaCentre AIO 520-27ICB Backlight issue

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  • REpairAT
    Senior Member
    • Nov 2020
    • 143
    • Austria
    #1

    Lenovo IdeaCentre AIO 520-27ICB Backlight issue

    Hi,
    got this AIO with a backlight issue, it just turns on for the blink of a moment.
    LED backlight stripes tested and working, no schematics available, also I couldn't find any datasheet of this responsible "554ALN" chip. I don't have a real routine with fixing these kind of issues, but maybe someone could give me a hint where to start.
    As soon as the computer is turned on, 20V on the LED output. When backlight turns on, Voltage rises to 50V as it should, but immediately starts to decrease to 20V again within 30sec.
    Picture of the backlight circuit and model numbers attached.

    Thanks!
    BR, Ray
    Attached Files
    Last edited by REpairAT; 05-09-2022, 11:58 AM.
    Tags: None
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