Why does my iPhone screen keep dimming by itself?


Do you ever open your iPhone and realize that your screen is a lot dimmer than it was an hour ago? Well, this is no coincidence. It’s an automatic measure that Apple has programmed into every iPhone device as a battery-saving measure.

The brightness automatically adjusts depending on how much light there is in your environment. The less light you have around you, the dimmer your screen becomes.

Maybe you prefer your iPhone to always be on the same brightness level. Maybe you struggle with your eyesight and you just see better when your phone has a higher brightness level, whether you’re in a dark place or not.

The good news is that there is a way to adjust the brightness level of your iPhone so that it never lights up again.

The brightness automatically adjusts depending on how much light there is in your environment.  The less light you have around you, the dimmer your screen becomes.

The brightness automatically adjusts depending on how much light there is in your environment. The less light you have around you, the dimmer your screen becomes.
(cyberguy.com)

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How do I adjust the brightness level on my iPhone?

Adjusting your brightness level is quite easy and there are two different ways to do it. The first way goes like this:

  • Open your iPhone and use your finger to swipe down from the top right corner of the screen
The brightness automatically adjusts depending on how much light there is in your environment.  The less light you have around you, the dimmer your screen becomes.

The brightness automatically adjusts depending on how much light there is in your environment. The less light you have around you, the dimmer your screen becomes.
(CyberGuy.com)

  • Go to the Brightness icon and slide up and down until you reach a level you feel comfortable with
Here's how to adjust the brightness on your iPhone.

Here’s how to adjust the brightness on your iPhone.
(CyberGuy.com)

The other way to adjust your brightness levels on your iPhone is as follows:

Go here to adjust the brightness on your iPhone.

Go here to adjust the brightness on your iPhone.
(CyberGuy.com)

  • Go to the slider for brightness and slide it left or right until you reach a level you feel comfortable with
Here's how to adjust the brightness on your iPhone.

Here’s how to adjust the brightness on your iPhone.
(CyberGuy.com)

How do I prevent the brightness level from automatically dimming?

There are two things you need to do to keep your phone’s brightness at the same consistent level, and both need to be adjusted in your Settings app.

The first is by disabling Auto-Brightness (this only applies to iPhone 14 Pro and Pro-Max models and newer) and the second is Turn off True Tone.

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Turn off automatic brightness

Turn off True Tone

Here's how to disable your iPhone's True Tone.

Here’s how to disable your iPhone’s True Tone.
(CyberGuy.com)

  • open up Institutions app
  • Scroll down and select Display and brightness
  • Below the brightness slider is the True Tone option. Alternate this from
This is the slider to enable or disable True Tone.

This is the slider to enable or disable True Tone.
(CyberGuy.com)

What else can I do to prevent my brightness level from changing?

APPLE’S REPLACEMENT FOR THE PASSWORD

The most important thing to watch out for so that your brightness levels stay the same is that your iPhone does not overheat. Even if you have disabled Auto-Brightness and True Tone, your iPhone will automatically lower the brightness level if the device overheats as a safety measure.

Your phone can sometimes overheat within seconds if left in the sun or in a hot place (for example, in a car) for too long. It can also overheat if you have a faulty battery that needs to be replaced.

How do I check my phone’s battery status?

Go to Institutions

Scroll down and select Battery

Here's how to check your iPhone's battery health.

Here’s how to check your iPhone’s battery health.
(CyberGuy.com)

Select Battery status and charging

This screen shows the battery status level for your iPhone.

This screen shows the battery status level for your iPhone.
(CyberGuy.com)

A display of your battery’s health level appears.

This screen shows the health level of your battery.

This screen shows the health level of your battery.
(CyberGuy.com)

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If your maximum capacity is less than 80%, Apple recommends that you buy a new battery.

For more Apple tips, visit CyberGuy.com and search for “Apple” and subscribe to my free CyberGuy Report newsletter at CyberGuy.com/Newsletter.