1. katesbb's Avatar
    When my iPhone 6 i(running 8.3) is first exposed to sunlight, the automatic brightness brightens to 100% (or close to it) as you'd expect. But after a few minutes in the summer sun, it'll suddenly dim itself substantially. No fading to the new level, it just suddenly drops in brightness. Sometimes it'll do it multiple times separated by a few minutes.

    The brightness slider doesn't change when this happens, and toggling it from manual to automatic or sliding the slider can't get it back to it's original brightness. It seems I have to go indoors for awhile (where it naturally dims), then when I go back outside it's super bright again... until a few minutes later it drops to being somewhat dim again. Repeat.

    Any chance there's a thermal sensor in the iPhone which turns down the LCD panel's backlight whenever it gets too hot? That's the only thing I've noticed - that it gets rather hot in sunlight after a few minutes.

    Or does my phone have a hardware fault?

    It's generally still viewable after it dims, but it's the difference between being easily readable and a bit of a struggle to see in sunlight.
    06-06-2015 04:07 PM
  2. kch50428's Avatar
    It could be heat related... I'd visit a Genius Bar if one is close... Describe what's going on to them, and see what they have to say.
    06-06-2015 05:03 PM
  3. katesbb's Avatar
    I was able to replicate it using a friends iPhone 6 as well.

    After googling around some more, I found others mentioning it, as well as this overheating note from Apple: https://support.apple.com/en-us/HT201678

    So I guess it's normal to dim the screen when it gets too hot, though maybe not normal that it is getting too hot.

    I'm surprised so few people have mentioned it though, since I can easily replicate it with two phones now.

    One thing both phones have in common is we both use the same case. I've tried it now without the case and it doesn't dim as much as when using the case.

    Just FYI for others
    06-06-2015 05:52 PM
  4. Ledsteplin's Avatar
    I was able to replicate it using a friends iPhone 6 as well.

    After googling around some more, I found others mentioning it, as well as this overheating note from Apple: https://support.apple.com/en-us/HT201678

    So I guess it's normal to dim the screen when it gets too hot, though maybe not normal that it is getting too hot.

    I'm surprised so few people have mentioned it though, since I can easily replicate it with two phones now.

    One thing both phones have in common is we both use the same case. I've tried it now without the case and it doesn't dim as much as when using the case.

    Just FYI for others
    Phones will get hotter in a case,


    06-06-2015 06:22 PM
  5. Ledsteplin's Avatar
    extend your phone battery by turning off some apps that are not necessary.
    And which apps would those be?


    06-08-2015 07:17 AM
  6. Pale Wraith's Avatar
    I've been having this issue lately with temperatures hitting 100. I put my 6 Plus to sleep and stick it in my pocket for a minute or two and everything's fine again.


    Sent from my iPhone 6 Plus
    06-08-2015 11:37 AM
  7. katesbb's Avatar
    I've been having this issue lately with temperatures hitting 100. I put my 6 Plus to sleep and stick it in my pocket for a minute or two and everything's fine again.
    Same here. Get it into shade for a few minutes, and all is well again.

    It makes sense in hindsight, but my androids and BlackBerries never did/do that, even though they got really hot too. I guess it's a good idea though - don't want to have my pretty phone melt
    06-08-2015 11:56 AM

Similar Threads

  1. Replies: 2
    Last Post: 06-07-2015, 12:14 AM
  2. 8 Apple Watch fixes I want in the next software update
    By iMore.com in forum iMore.com News Discussion
    Replies: 2
    Last Post: 06-06-2015, 02:47 PM
  3. Replies: 2
    Last Post: 06-05-2015, 09:41 PM
  4. Orange Checkmark when I sign in to my Mac?
    By Strings78 in forum OS X Yosemite (10.10)
    Replies: 1
    Last Post: 06-05-2015, 06:54 PM
LINK TO POST COPIED TO CLIPBOARD