iPhone brightness keeps dropping

Discussion in 'iPhone' started by Despacio, Jul 11, 2014.

  1. Despacio macrumors member

    Jun 23, 2010
    Hello, has anyone else had issues where there iPhone 5s is at maximum brightness and suddenly it will noticeably drop to a lower one?

    I know the first reaction is the auto brightness option. But I always have that off. Always. I've never used it nor liked it very much.

    Nontheless it's happened quite a few times, and it's particularly painful during the day at times. I'll even adjust the brightness bar back to low and back to high again but it never hits the brightness it was noticeably at to begin with.

    Anyways, has anyone ever had this problem before? Thanks!
  2. I7guy macrumors G5

    Nov 30, 2013
    Looking at Central Park@550 feet
    Have you tried to reset your phone, to see if a reset resolves the issue.
  3. Jaguarr40 macrumors regular


    Jul 10, 2014
    Sarasota, Florida
    Try this:

    Go into a dimly lit or dark room.
    Open your Settings app from the Home screen of your iPhone, iPad.

    Tap on Brightness & Wallpaper.

    Turn the auto-brightness setting to Off.

    Adjust the brightness slider to the level you would like your screen brightness to be at in the given area. if you're in a completely dark room, you'll probably want to put the slider all the way to low or pretty close to all the way down.

    Turn the auto-brightness setting to On again.

    Turn on your light switch.
    Watch the brightness slider move upwards to adjust to the new light entering the sensor.
    As long as the brightness slider is moving on its own, you have just re-calibrated the sensor and it should work properly from here on out.

    Try this and it should work....Good luck.:)
  4. powerstrokin macrumors 6502a


    May 18, 2013
    Is your phone in a hot environment (in direct sunlight, tethering long periods making the phone hot, etc.) when this happens?

    If the phone becomes hot, the screen will not go to "full" brightness until it cools down. It also may automatically slow its charge rate or refuse to charge at all and if even hotter, may disable completely and show a "warning- too hot" type of message on the screen.

    Keep in mind, these are basically very powerful very tiny computers and have no fans and no real heat sink with fins to keep themselves cool.
  5. sunking101 macrumors 603


    Sep 19, 2013
    My Android tablet has done this from new, and my iPhone 4 did it. The i5 has been ok when it comes to the screen auto brightness.
  6. Newtons Apple macrumors P6

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    Like another poster suggested, it sounds like your phone is trying to protect itself from overheating and reducing the brightness when out doors.

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