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A2289 / No Display / Chime / Restarts

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    A2289 / No Display / Chime / Restarts

    Hi,

    I am working on a MacBook Pro A2289.

    The MacBook powers on 20v / AMPS go up but return to 0 shortly after the chime.

    The screen stays black.

    I can get HDMI output. I tried to boot using an external drive, but the problem persists.

    If left, the MacBook will keep restarting.

    I tried a different screen.

    Any ideas where to start looking?
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