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820-00239 No Backlight - Output volt is 54.45v

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  • JohnB8812
    replied
    54 volts means no load. Bad screen or cable

    Leave a comment:


  • 2informaticos
    replied
    54V means no connection with LEDs strip from LCD assembly.
    If still same with known good assembly, then you must have bad LCD connector, or video cable.
    Last edited by 2informaticos; 09-11-2019, 11:00 AM.

    Leave a comment:


  • bharataus
    started a topic 820-00239 No Backlight - Output volt is 54.45v

    820-00239 No Backlight - Output volt is 54.45v

    Hi !

    On this mackbook 820-00239 I have No Back-light Issue.
    output volt is 54.45 .

    While testing the back light circuit once i measured 45v on output, I check the screen It has image and was showing apple logo with back light on, I thought its working.
    but when i pack it up it still has no back-light and showing 54.45v on output.


    I have tried motherboard on another mackbook which has working screen, but still no luck.

    Can anyone guide me to the right direction ?
    thanks
    Last edited by bharataus; 09-11-2019, 07:01 AM.

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