Backlight stops working, but only after boot.

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

  1. r3dplanet macrumors newbie

    Aug 6, 2012
    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?

  2. yadmonkey macrumors 65816


    Aug 13, 2002
    Western Spiral
  3. CausticPuppy macrumors 65816

    May 1, 2012
    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).

Share This Page