Backlight Refusing to Light Up

Discussion in 'MacBook Pro' started by Yimbie, Aug 18, 2010.

  1. Yimbie macrumors member

    Aug 3, 2010
    When I try to turn up the backlight of my keyboard, it keeps giving me the "zero" symbol that looks like a O with a / through it. I have not spilled anything and haven't tampered with anything. Will it refuse to light up if I'm in a lit enough area?
  2. celticpride678

    Feb 15, 2009
    Boston, MA
    Yes, if you're in a well-lit area, the backlight will not turn on.
  3. TRUCRACKER macrumors 6502


    May 31, 2010
    Wow it must be REALLY well lit cause I've never seen that.
  4. Yimbie thread starter macrumors member

    Aug 3, 2010
    I was just sitting in my living room. No unusual bright lighting either. I guess regular daylight will prevent it.
  5. MiBook84 macrumors member

    Nov 2, 2008
    Malmö, Sweden
    Its true, when the computer is in a bright room the lights will not turn on. This is probably because it is useless in daylight. It can almost not even be seen and if one was to use it on battery it would drain it quite fast.

    You can hold your hand over the ambient light sensor and activate the light by pushing the light up button (F6). The ambient light sensor is located a few millimeters to the left from the iSight camera on your MacBook Pro unibody.

    If you have a MacBook Pro that is not unibody there is two ambient light sensors, each one under the two speaker grills on the sides of the keyboard.
  6. Moocher macrumors regular

    Mar 5, 2008
    NE Atlanta area

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