Symptoms
- Brightness slider is high but screen looks dim
- Screen looks fine in the dark but dim in daylight
- Dims further and won't go back up
- Happens right after unlocking
Likely causes
- CommonAuto-brightness misreading the light sensorA dirty or blocked sensor near the front camera can cap brightness incorrectly.
- CommonLow power or battery saver modeThese modes often cap max brightness to save battery.
- CommonScreen protector or case blocking the light sensorA thick or misaligned protector can cover the sensor near the top of the screen.
- PossibleAging display or backlight wearOlder screens can lose maximum brightness over time.
What to do
- Turn off auto-brightness and set brightness manually to full to test.
- Turn off battery saver or low power mode.
- Clean the area around the front camera and light sensor.
- Check that a case or protector isn't covering the sensor.
- Restart the phone and check for a software update.
- Compare brightness in a bright room and outdoors to judge how much dimmer than normal it is.
Tools and parts
- Microfiber cloth
When to call a pro
See a repair shop if brightness stays capped low with battery saver off, auto-brightness off, and a clean sensor.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.