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Home > Tips > [Solved] Why Does iPhone Screen Dim When Watching Videos

[Solved] Why Does iPhone Screen Dim When Watching Videos

Recently I see some users complain iPhone screen dims when watching videos. Why does this issue occur and how to solve it? In the following article, I will explain the cause and provide some practical ways.

Updated Oct 24,2018 | by Micky

iPhone screen dims when watching videos. What should I do and how to fix it?”

Recently, some users complain that when they’re watching a video, their iPhone screen dims and power off and they have to tap on the screen every a few minutes to keep it on. Many of them tried rebooting their iPhone but it didn’ help. They have no idea why this glitch occurs and are seeking for a way to solve it.

In the following tutorial, I will explain why iPhone screen dims when watching videos and how to fix it.


A Recommended Reading: What to Do When iPhone Screen Is Not Responsive to Touch

Method 1 Let iPhone Sleep for A While

When the hardware on your iPhone gets too warm, in order to cool down, the screen sometimes will automatically dim and the phone may be powered off.

So, if the iPhone screen keeps dimming when watching videos, don’t panic, try shutting down the iPhone and let it have a rest for a while.

For iPhone X and Later Models

1.       Long press both Power button and Volume down button until the slider appears.

2.       Swipe the slider to the left to shut it down.

For iPhone 8 and Earlier Modes.

1.       Long press both Power button and Home button until the slider appears.

2.       Swipe the slider to the left to power off your device.

Method 2 Turn off Auto Lock

Why does iPhone screen dim when watching videos? The feature of Auto Lock is a screen saver for iOS devices. When your iPhone has been inactive for a period of time, the screen will dim to save power. So, one of the best way to troubleshoot the screen dimming issue it to disable Auto Lock.

Go to Settings > General > Auto Lock. Select Never.

Method 3 Turn off Auto Brightness

If your iPhone’s Auto Brightness is turned on, when you go somewhere dark, the screen will dim to make the light less sharper to protect your eyes. Otherwise, the screen will get brighter.

Try turning off iPhone Auto Brightness and that may fix the problem you’re encountering.

Go to Settings > Display & Brightness, toggle off Auto-Brightness.

Method 4 Reinstall iOS Software

Recently, some users said iPhone screen dimmed when watching videos right after updating to iOS 12. So, as far as we’re concerned, it’s possible that the installation is not complete yet and some files might be missing. In this case, you’d better reinstall iOS 12 via iTunes again. Follow the detailed guide below to learn how to update your iOS software.

1.       Make sure you’ve updated iTunes to the latest version.

2.       Connect your iPhone to PC and launch iTunes.

3.       Click on the device icon on the upper left.


4.       Click on Restore iPhone. Then a confirmation box will pop up.

5.       Click on Restore and finish the license agreement to begin the process


6.       Follow the onscreen guide to get it done.

Bottom Line

Now, hopefully, you’ve understood what to do when iPhone screen keeps dimming. I gathered the 4 methods above among a large number of users who met this problem and in most cases, they turned to work well.

Have any further questions about iOS? Please contact us.

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