Backlight stops working, but only after boot.

Discussion in 'MacBook' started by r3dplanet, Aug 6, 2012.

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  1. r3dplanet, Aug 6, 2012

    r3dplanet macrumors newbie

    Joined:
    Aug 6, 2012
    #1
    Hi there.

    I'm working on a unibody Macbook model A1278 that had a liquid spill. I've disassembled the machine and cleaned it thoroughly with alcohol and compressed air.

    When I start the machine, I get the normal gray screen with the Apple logo. As soon as it brings me to the desktop the backlight stops working.

    Strangely, when I install a new OSX installation on a separate external USB hard drive, the entire procedure works just fine. The screen is clear as can be. Once it reboots ... *poof* ... and the LED "backlight" just turns off.

    I've already reset the PRAM.

    Any ideas?

    Thanks!
     
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  2. yadmonkey, Aug 8, 2012

    yadmonkey macrumors 65816

    yadmonkey

    Joined:
    Aug 13, 2002
    Location:
    Western Spiral
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  3. CausticPuppy, Aug 9, 2012

    CausticPuppy macrumors 65816

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    May 1, 2012
    #3
    My MBP was doing that for a while.


    This will sound stupid, but try it: when the screen goes dark, try using the brightness control to turn up the brightness.
    When the brightness is turned all the way down, the backlight goes off; so mine was resetting to minimum brightness every time it booted up (or woke from sleep).
     
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