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The iPhone backlight creates a considerable amount of heat. It is quite common for the phone to dim the back lights if the phone is overheated either due to ambient temperature or the CPU working hard. This is pretty common knowledge.
 
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I just noticed mine doing this as well!!
Happens mostly on full brightness. Just figured out it does it when the Phone gets hot. Not sure if it's getting too hot is normal? Sometimes I touch the backing of the phone and it's pretty hot.
 
it might be a bug on your iphone6+ after you updated the latest ios. mine works just fine. but i think it happens to some of the iphone6+ users. Try to reboot your phone but pressing the lock button and home button at the same time until it turns off and then turn it on after 30 seconds.
 
This happened to me on release date and I can 100% assure you it's due to overheating. If you have tons of apps open, downloading a ton, or anything that uses a lot of power for a relatively long time then it will auto dim for safety. After I figured it out a few days later I just adjusted to 75% brightness and haven't had to deal with the issue.
 
I don't like the auto-brightness feature so I turn it off all the time. However, I noticed something strange tonight that the screen actually dimmed itself a little bit, and if I want to go back to full brightness, I had to restart the phone.

Does anyone know if this issue is hardware-related or software-related?

It's 100% due to overheating. I googled this issue this very second when my screen was dim on my 6s plus after my device was just rebooting from installing 9.1 beta4. It was hot but as I was reading this thread it was cooling down and brightness going up simultaneously.
 
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To add to this thread, since I had the same problem... The case you use can affect this as well. This started happening to me more when I got a slightly bulkier case for drop protection.

Remember that the phone's aluminum case is designated to radiate heat. Covering it up will cause overheating during heavy usage.
 
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Had never experienced this issue until the 6S (Samsung CPU), and I've owned every iPhone.

This is a joke. Installing apps or heavy gaming make the screen too dark to use.
 
It's 100% due to overheating. I googled this issue this very second when my screen was dim on my 6s plus after my device was just rebooting from installing 9.1 beta4. It was hot but as I was reading this thread it was cooling down and brightness going up simultaneously.


Yeah, I also noticed this on my iPad mini. Initially, I thought it was defective or something, so now I know that is actually protecting the hardware, which is good. Just wished that Apple could address the heat in other ways.
 
Good day all, I haven't searched the forums with great detail if there has been a solution to this issue...Although I would like to give my observation with my iphone 6s and the screen dimming while playing Clash of Clans...

Whenever I would play CoC and I wouldn't touch the screen, or touched the screen within one minute, the screen would dim...tried many of the fixes via google search and nothing worked...

Then I thought to myself...wonder if its my Auto-lock selection that is causing the screen to dim...Had it selected for 1 minute... So I changed it to never, and the screen now hasn't dimmed while playing the game, even when I don't touch the screen for a few minutes while building troops.

I can't say this will help those that play any game for hours at a time and in regards to over heating or heat issues in general, but it doesn't dim for me anymore.

I will test it more and try setting it back at one minute and time it, set it to two minutes etc...

Have a great day everyone!
 
Good day all, I haven't searched the forums with great detail if there has been a solution to this issue...Although I would like to give my observation with my iphone 6s and the screen dimming while playing Clash of Clans...

Whenever I would play CoC and I wouldn't touch the screen, or touched the screen within one minute, the screen would dim...tried many of the fixes via google search and nothing worked...

Then I thought to myself...wonder if its my Auto-lock selection that is causing the screen to dim...Had it selected for 1 minute... So I changed it to never, and the screen now hasn't dimmed while playing the game, even when I don't touch the screen for a few minutes while building troops.

I can't say this will help those that play any game for hours at a time and in regards to over heating or heat issues in general, but it doesn't dim for me anymore.

I will test it more and try setting it back at one minute and time it, set it to two minutes etc...

Have a great day everyone!


Yeah, same thing here. When I play COC, iPhone and iPad are getting hot. The reason the device dims itself is due to protection of overheating. I have seen many devices do that, so I think that is normal. Suggestion for you: when you play intense games, turn down your display brightness level.
 
Yeah, same thing here. When I play COC, iPhone and iPad are getting hot. The reason the device dims itself is due to protection of overheating. I have seen many devices do that, so I think that is normal. Suggestion for you: when you play intense games, turn down your display brightness level.

Apologies; The game doesn't dim on me anymore even after playing CoC for a few hours straight...Changed the Auto-Lock Timer to Never and haven't had issue...Maybe being a new phone? *shrug* or possibly the 1/3rd Brightness I have it set at? Or I just don't play the games I have for LONG periods of time?

Cheers
 
Apologies; The game doesn't dim on me anymore even after playing CoC for a few hours straight...Changed the Auto-Lock Timer to Never and haven't had issue...Maybe being a new phone? *shrug* or possibly the 1/3rd Brightness I have it set at? Or I just don't play the games I have for LONG periods of time?

Cheers


If your brightness is set to 2/3 or less when you play COC, it won't have the overheating problem. However, if you play it with full brightness, it will sure have overheating problem as I notice the same thing on iPad Pro or iPad mini.
 
My iPhone 6s Plus has been doing this when I'm playing games or watching videos. I can feel the back is hot and then the screen will dim for a few minutes and then rebrighten again. I have my auto brightness off. Is this normal??
 
My iPhone 6s Plus has been doing this when I'm playing games or watching videos. I can feel the back is hot and then the screen will dim for a few minutes and then rebrighten again. I have my auto brightness off. Is this normal??

Yes. When you phone reaches too high of an internal temp it will dim the back lighting to help keep it from getting hotter. The CPU can also clock down. Back lighting is a major heat source in the iPhone.

It is normal.
 
Does anyone know if this issue is hardware-related or software-related?[/QUOTE]
[doublepost=1482988226][/doublepost]
Still having this issue on an iPhone 6 and iOS 8.4.
Anyone else??
Same thing happening to me and it does happen a lot.
 
Does anyone know if this issue is hardware-related or software-related?
[doublepost=1482988226][/doublepost]Same thing happening to me and it does happen a lot.[/QUOTE]

It is physics related. If playing games or doing something CPU intensive you phone will get warm. If too warm it will did the display to cool things down. I guess it could a called software related as it is Apple's software that tells the phone to dim its screen to protect itself.

It is normal.
 
[doublepost=1482988226][/doublepost]Same thing happening to me and it does happen a lot.

It is physics related. If playing games or doing something CPU intensive you phone will get warm. If too warm it will did the display to cool things down. I guess it could a called software related as it is Apple's software that tells the phone to dim its screen to protect itself.

It is normal.[/QUOTE]

Yep it is. Had multiple iPhone since posting in this tread and all of them did this when they got too hot (usually in the sun).
 
It is physics related. If playing games or doing something CPU intensive you phone will get warm. If too warm it will did the display to cool things down. I guess it could a called software related as it is Apple's software that tells the phone to dim its screen to protect itself.

It is normal.

Yep it is. Had multiple iPhone since posting in this tread and all of them did this when they got too hot (usually in the sun).[/QUOTE]

I doubt many see this dimming due to the sun, betting is is just overheating from the CPU and backlighting.
 
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I had similar issues with my 5s in the past, and I didn't really give extra attention to it. But I can't believe this issue still exists now. Disappointing.

I can't really replicate the issue as I don't know when it will dim. It's very random.

I already restored the phone by downloading brand new OS from iTunes, and after installing and playing with it, the issue reappeared again.
[doublepost=1487586586][/doublepost]I also am having this issue with my 128 g I phone 6 plus and I turned auto dim off set to high bright and the screen dims it's annoying and gives me a strange feeling like my phone is maybe hacked or tracked or something I don't like it .
 
[doublepost=1487586586][/doublepost]

I also am having this issue with my 128 g I phone 6 plus and I turned auto dim off set to high bright and the screen dims it's annoying and gives me a strange feeling like my phone is maybe hacked or tracked or something I don't like it .

Does it dim all the time of just after using it for a while. Heat from use of in a very hot environment will cause the phone top dim to help it cool off.
 
Does it dim all the time of just after using it for a while. Heat from use of in a very hot environment will cause the phone top dim to help it cool off.

Mine is a separate issue. My iPhone 6 is not even remotely warm, and won't go above 70% brightness when the phone goes below 70% battery, or 50% brightness when the phone goes below 50% battery, and will remain that way even when plugged in. You can 'trick' it out of this by switching between zoomed and normal views, but you have to do it every time the phone passes those battery levels.

This started immediately with 10.2.1 and is a quite undesirable battery saving 'feature.' Even low power mode gives you an option to disregard if you need performance more than battery life in a given circumstance, and effectively limiting half of the phone's usable battery life to a noticeably dim screen is a substantial usability compromise.
 
I'm having this problem with my 6s, running iOS 10.2.1. It doesn't matter when I use the phone or what I'm doing. It can be sitting for any amount of time and when I pick it up it's dim. I can start playing a game, using safari, youtube, anything, and it will go back to the brightness it should be. Then it will go back to being dim, and keep doing this randomly.
 
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