Samsung screen keeps dimming? 7 fixes to try

A screen that gets darker on its own is annoying, especially in sunlight. On a Galaxy it is almost always one of a few features that are designed to dim the display on purpose. Work through the fixes below in order and you will find which one it is. The steps use One UI menu names, which can differ slightly between versions.

Why a Galaxy screen dims by itself

Samsung phones lower brightness for several reasons. Adaptive brightness learns your habits and reacts to the light sensor. Extra dim makes the screen darker than the lowest slider setting. Power saving modes cut brightness to save battery. The phone also dims the screen to protect itself when it is hot. And a short screen timeout makes the display go dark quickly, which can feel like dimming.

Fix 2: Check Extra dim

Extra dim is a feature that makes the screen darker than normal for low light. Open the quick panel and look for Extra dim in the tiles, or go to Settings › Display and look under Brightness for an Extra dim switch. In some versions it is under Settings › Accessibility. If it is on, turn it off and test the screen in a bright room.

Fix 4: Check Screen timeout and Smart stay

If the screen goes dark while you are reading, the Screen timeout may be too short. Open Settings › Display › Screen timeout and choose 2 minutes or longer. Some versions also have Keep screen on while viewing, which uses the front camera to see that you are looking. It can be found in Settings › Advanced features on some versions. Turning it on keeps the screen lit while you look at it.

Fix 5: Let the phone cool down

A hot phone dims its screen to protect the battery and the display. This happens in the sun, when charging fast, while gaming or filming, and in a hot car. Take off the case, move to the shade, stop heavy apps and unplug the charger. If the screen returns to normal after cooling down, heat was the cause. See our guide to an Android phone that overheats for what to do if it happens often.

Fix 6: Check the light sensor and the screen protector

The light sensor sits near the top of the screen. A thick or badly placed screen protector, a dirty spot or a case lip can cover it, which makes Adaptive brightness think the room is dark. Clean the top of the screen, and if you use a protector, check that it leaves the sensor area clear. If brightness is fine without the protector, replace it with one made for your model.

Screen dims when brightness is at maximum

In bright light, Galaxy phones can use a higher brightness level for a short time when you slide to the top. After a while, the phone lowers it to control heat and battery use. This is normal. If the screen looks too dim even with every setting off and the phone cool, test with a different app and check whether the dimming follows one app only.

Dimming only in certain apps or when you watch video

If the screen dims in one app, the app may be the cause. Some video, reading and map apps set their own brightness or dim the screen after a short time. Check the app’s settings for a brightness or keep screen on option. Apps that draw over other apps, such as screen filters and floating tools, can also lower brightness. Open Settings › Apps and look for anything that says it can appear on top, then remove the ones you do not need.Video can look dimmer than the rest of the phone when Video brightness is lowered in the display settings. If you see a Video brightness setting, set it to Normal or Bright and test again.

Dimming after an update or a new case

A software update can reset brightness settings or turn on Adaptive brightness again. If the dimming started right after an update, repeat Fix 1 and Fix 3 and check Extra dim. A new case with a flap or a new screen protector can also start the problem, because it changes how much light reaches the sensor. Remove it for a day and see if the dimming stops. If the problem began after a drop or after the phone got wet, skip the settings and go to the hardware section below.

When dimming points to a hardware problem

• The screen dims or flickers even in Safe mode and after a software update.
• You see lines, dark patches or color changes along with the dimming.
• The phone was dropped, got wet, or has a swollen battery.
• The battery drains very fast or the phone gets hot with no heavy use.

At that point, have the phone checked. Our guide to checking Samsung battery health shows how to run Samsung’s built-in diagnostics, and you can compare repair prices in our Samsung screen replacement cost guide before you decide.

Quick checklist

• Adaptive brightness is off and the slider is where you want it.
• Extra dim and Power saving are off.
• Screen timeout is long enough.
• The phone is cool and out of direct sun.
• The light sensor is not covered by a protector or dirt.
• The software is updated and Safe mode was tested.