The proximity (light) sensor on Xiaomi is responsible for automatically adjusting the brightness, as well as turning off the display during a call. Failure in its work can cause a lot of inconvenience, for example, the display may stop turning off during calls, which will lead to accidental clicks, as well as to increased battery consumption. The issue can be resolved by calibrating the proximity sensor.
The reasons for the failures can be different, so first of all it is worth rebooting Xiaomi. If this does not help, then let’s look at solutions to the problem from the simplest to the most complex:
Table of Contents
Is the sensor on?
Check first if the sensor is on. To do this, open the "Phone" application and hold down the left touch key in the form of three horizontal stripes. In the menu that opens, go to Incoming calls > Turn off the screen during a call (proximity sensor). Depending on the smartphone model and MIUI version, the names of the menu items may vary slightly.
Turn off the lock function in your pocket
The activation of this function is one of the causes of sensor failures. Again, it can turn off differently on different models. First of all, we look in the menu "Incoming Calls"
If you do not have such an item, then go to Settings > Lock screen and fingerprint > Advanced settings > Pocket Mode and turn it off.
Removing Physical Obstacles
Another reason for the malfunction of the sensor is a non-original protective glass or film on the screen. The sensor itself is located next to the front camera and earpiece. There should be a hole in this place, if it is not there, then you need to change the film or cut it yourself.
Proximity Sensor Calibration
If the above methods did not help, you should calibrate the proximity sensor, but first check if it works at all. To do this, call the engineering menu. In dialing mode, enter * # * # 6484 # * # * or * # * # 4636 # * # * and see the following picture:
Here we are interested in the item “Single item Test”, open it and look for the item “Proximity Sensor” in a new window
A test will open where, when the sensor overlaps with the finger, the inscription “Close” should appear. If you remove your finger, the message “Far” will appear. If the sensor does not respond, you need to carry the smartphone to the service center, and if everything is working properly, you can proceed with the calibration.
- Turn off the smartphone.
- Hold down the “Volume Up” + “Power” button and wait for the vibration, after which the keys can be released.
- A menu will open, which is likely to be entirely in Chinese. To change it to English, click the "中文" button.
- Next, click "PCBA test" and in the new window we are interested in the item "Proximity sensor".
- We lay the smartphone horizontally on a flat surface. In this case, the light sensor must not be closed or dirty. It is also worth excluding the ingress of bright light on it.
- Click “Calibration” to start the calibration. Upon completion, you will see the inscription “Successfully”.
After the process is completed, it will be necessary to check the sensor for operability. We cover it with a finger or an opaque object: if the number "1" on the screen changes to "0", then everything is in order. Now click on the “Pass” item to return to the engineering menu, and then “Finish”, after which the smartphone will turn off.
We turn on the device again and check the operation of the sensor, bringing the phone to your ear during a call – the display should turn off.
If the calibration did not help
There are times when calibration does not help. The reasons may be as follows:
- Problems with the firmware, to fix which it is worth reflashing the device
- Perhaps after repair, the display was replaced with a non-original
- Banal marriage – in this case, you are dear to the service center or to the seller
For clarity, we recommend watching the video: