IPhone Auto Brightness Calibration may be required if the phone does not work correctly to automatically set the screen brightness. Many Apple iPhone users periodically complain about problems with adjusting the automatic brightness of their devices in different lighting conditions.
Often the owners of the iPhone associate the problems of adjusting the brightness with the operation of the light sensor, which is located under the protective glass (in its upper part). There are times when the sensor fails due to a fall or other mechanical impact. If this is the reason, then you will either need to correctly install the sensor under the glass (for this you will need to completely disassemble the device), or replace the light sensor itself, which, as a rule, is on the same cable with other peripheral elements (buttons, front camera).
But there are times when the sensor is absolutely serviceable, but the automatic brightness adjustment of the display backlight is still set incorrectly. In this situation, you can try to adjust the settings for automatically adjusting the brightness of the iPhone manually.
How to calibrate iPhone auto brightness
Consider the simplest way Auto brightness calibration using the iPhone 6 as an example.
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As you can see in the image, the light sensor is located at the top of the phone, above the earpiece grid. On devices with a white protective glass, the sensor can be seen more or less clearly, on devices with black glass the sensor is practically invisible.
1. Go into some dark place, get the phone. Disable the item in the device settings "Auto brightness" (in iOS 10, this item is in the menu item "Screen and brightness"; in iOS 11, you need to follow the settings in the way: Basic. Universal access. Display adaptation. Auto brightness). Bring some kind of bright light (such as a flashlight) with you.
2. When you are in a dark room, go back to the settings menu and manually drag the brightness adjustment slider to the left, to the minimum level.
3. Then take a light source and shine at different angles on the surface of the screen in the area of the light sensor. After that, drag the slider to the right, gradually increasing the brightness of the backlight to the level so that you can see what is displayed on the screen of the device.
In fact, this completes the calibration operation. proximity sensor, when automatic brightness control is on (switch "Auto brightness" must be active in the settings), it must increase or decrease the brightness of the display backlight, depending on the brightness and intensity of the surrounding lighting.
If the light sensor does not work correctly or does not work at all, then you should already contact a service center. perhaps the problem is a hardware malfunction of the phone, and it will be possible to eliminate it qualitatively only in the conditions of a service center.