Setup of the proximity sensor Xiaomi 11T: the full guide

A proximity sensor problem on Xiaomi 11T can turn a normal phone conversation into a real test: the screen suddenly goes out, does not respond to touches, or, conversely, continues to burn, pressing its cheek against the screen, causing calls to be dropped or accidentally turned on speakerphone. The approach sensor is a tiny but critical interface element that is often hidden under a protective glass or in a thin display frame.

Owners of the Mi 11T and Mi 11T Pro flagship models sometimes experience software failures after MIUI or HyperOS updates, as well as physical sensor contamination. In this guide, we will detail software calibration methods through the engineering menu, check the effects of protective glasses, and discuss when hardware intervention is required.

Before you bring your smartphone to the service center, you should try a comprehensive diagnostics software, often solved by simple data cleaning or adjusting the sensitivity of the sensor, which takes only a few minutes, and we will look at all the methods available, from standard settings to hidden engineering codes.

Principle of operation and location of the sensor

Unlike older smartphone models, where the sensor was visible in the top bezel, the Xiaomi 11T uses ultrasonic sensor technology or infrared sensor integrated directly into the display. This allows you to reduce the size of the bangs and increase the usable area of the screen. Ultrasonic technology measures the distance to an object by emitting high-frequency sound waves that are not audible to the human ear.

The design feature of the Mi 11T is that the sensor is located under a layer of glass. Any contamination, greasy spots or improperly pasted protective glass can distort the readings. Calibration in this case is a software procedure that helps the system to understand which distance is considered "close" and which is "far".

If the software setup doesn't work, it may be the physical integrity of the plume or the module itself, but in 90% of cases, software failures can be handled by yourself using built-in MIUI diagnostic tools.

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Ultrazooch sensors are less susceptible to dirt than optical ones, but thick protective glass (more than 0.3 mm) can block their operation.

Basic screen inspection and cleaning

The first and most obvious step is to visually inspect and clean the top of the display. Even if the eye doesn't see any contamination, a microscopic layer of skin oil or glue residue from an old protective glass can interfere with ultrasonic waves. Wipe the area above the speaker with soft microfiber cloth, a lightly moistened screen cleaner.

If you've recently changed your screen protection and the problem came right after that, it's almost certainly the accessory. Cheap glass is often opaque or just too thick to block the sensor. Take it off and check the sensor.

⚠️ Warning: Do not use aggressive chemicals or abrasive materials for cleaning.This can damage the oleophobic coating and the sensor itself built into the display.

It's also worth checking if the system is overloaded with background processes. Sometimes a simple restart of the device allows you to reset temporary errors of the drivers controlling the sensor. Press and hold the power button, then select Reboot.

Using the CIT Engineering Menu for Diagnostics

The most reliable way to check the health (hardware) is through the built-in CIT engineering menu, which allows you to run the test of each component separately. To enter the menu, open the Phone app and type in the combination ##6484#. If the code does not work, go to Settings → About Phone and quickly click on the Version of the Kernel several times until the test menu opens.

In the test list, look for Proximity sensor or Approximation Sensor. Press it. The screen turns black, and instruction will appear to close the sensor with your hand. Hold your palm to the top of the screen, then remove it. The indicator should change color or value (for example, from 0.0 to 5.0) in response to movement.

If the sensor works perfectly in this test (the values change clearly), then it is correct, and the problem lies in the software or third-party applications. If the values "jump" or do not change at all, calibration or repair is required.

⚠️ Attention: Don't leave the menu CIT, Until you complete all the necessary tests, accidental resetting of settings in other sections can lead to malfunction of the system.

Sensor calibration procedure

If the CIT test showed unstable work, you need to perform a calibration. In some versions of the MIUI firmware for Xiaomi 11T, automatic calibration is available directly from the CIT menu. Find the Calibration button or Calibrate in the bottom corner of the sensor test screen. Press it and follow the instructions on the screen, closing and opening the sensor with your hand.

It's important to calibrate in a static position, putting the phone on a flat surface. Foreign objects near the top edge can knock down the sensitivity settings. Once the procedure is complete, the system will ask you to restart the device. Be sure to reboot to apply new parameters.

If there is no standard calibration button, you can try resetting the phone app. Go to Settings → Apps → All Apps → Find Phone (blue handset icon) → Memory → Clear → All data. This will return the call settings to factory settings.

Comparison of methods of troubleshooting

There are several approaches to solving the problem, and the choice depends on the symptoms. Below is a table to help you choose the right method of diagnosis and treatment for your case.

As you can see from the table, most problems are solved by software methods. However, if you see a “blink” screen or complete failure even after flashing, it can be a hardware failure. In the Xiaomi 11T sensor is often assembled with a display or charging plume (depending on the revision), which complicates repair.

Advanced settings and reset via ADB

For experienced users who have not been helped by standard methods, there is the possibility of resetting the sensor settings via USB debugging. This will require a computer and an installed ADB (Android Debug Bridge). Enable the developer mode by pressing the MIUI version 7 times in the settings, and activate Debugging over USB.

Connect the phone to your PC and enter a command to reset proximiti settings in the command line, which will return all sensor system parameters to factory status, removing any custom calibration files.

adb shell settings put system proximity_on 1


adb shell am broadcast -a android.intent.action.CLOSE_SYSTEM_DIALOGS

This command forcibly restarts system dialogs and can shake up the got stuck driver. However, using ADB requires caution: an incorrect command can lead to unstable system operation. Use this method only if you are confident in your actions.

⚠️ Attention: Use ADB-The warranty may be cancelled if there is an interference with system partitions.

When repair and replacement of parts is necessary

If neither calibration, reset, nor cleaning helped, and in the CIT test, the sensor shows zero values or chaotic jumps without physical impact, most likely the module itself failed.In Xiaomi 11T, the proximity sensor can be part of the charging port plume or integrated into the display module.

When replacing a display with a non-original (copy), calibration problems often arise, since cheap arrays may not have a quality layer for ultrasound, in such cases, only transferring the native sensor plume from the old broken screen to a new one or installing the original display helps.

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If the sensor doesn't work after replacing the display with a copy, it's a common compatibility problem, and the solution is to install the original module or move the sensor controller from the old screen.

An authorized service center is preferable, as specialists use professional equipment to accurately calibrate after replacing parts. Self-replacement requires small electronics skills and special tools.

Frequently Asked Questions (FAQ)