Solving proximity sensor issues on the Redmi Note 8 T

Owners of the popular Xiaomi Redmi Note 8 T smartphone often face the annoying problem of not turning off or lighting up during a conversation after the device is removed from the ear.This proximity sensor is a critical component that ensures comfortable communication and prevents accidental cheek pressing. If the sensor works incorrectly, it turns using the phone into torture, forcing users to look for solutions.

There are many reasons for this module to malfunction, from the commonplace contamination of the protective glass to software errors in the MIUI shell. It is important to understand that in most cases it is a software desynchronization or miscalibration, not a physical failure. In this article, we will discuss all possible methods of diagnosis and troubleshooting, so that your Redmi Note 8 T again works as new.

Reasons for the incorrect operation of the sensor

Before you start complex manipulations, you need to rule out obvious physical factors. The sensor in the Redmi Note 8 T is located at the top of the display, often hidden under a thin layer of glass or plastic. Any film, poor-quality protective glass or even a greasy trace can distort the infrared radiation that the sensor uses to determine the distance to the object.

Another common cause is software conflict: After updating the Android operating system or the MIUI shell, some system services may not work smoothly, driver failure or accumulated cache of the Phone application can also disrupt the logic of the sensor.

⚠️ Note: If you have recently changed the display or carried out body repairs, make sure that the sensor plume is tightly inserted into the connector, and the module itself is not covered with glue or foreign objects.

Checking the performance through the engineering menu

The first step in diagnostics should be to check the physical state of the sensor using the built-in tools of the system. Xiaomi smartphones have a special CIT engineering menu that allows you to test all hardware components without installing third-party software, which is the most reliable way to determine whether the system sees the sensor at all.

To run the test, you need to type a special code in the call app. Once you enter the combination, you will open a list of all the device modules. You need to find the item associated with the Proximity Sensor. When you hold your palm to the top of the screen, the values should change, and the indicator should switch from the Far state (far) to the Near state (close).

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If the sensor responds instantly and clearly in this menu, then the hardware is good, and the problem should be looked for in the settings of the software part or third-party applications. If the reaction is not at all or it is very weak, you may need a deeper intervention or replacement of the part.

Calibration of the proximity sensor

The most effective way to solve the problem of “glutty” screen is forced calibration, which causes the system to re-remember the thresholds of sensor sensitivity, which often eliminates false positives. In Xiaomi smartphones, this process is automated and takes only a few seconds.

To perform the calibration, you will again need to access the engineering menu using the code ##6484##. After entering, select the proximity sensor test. The screen will show an image with two circles or stripes simulating the state of "close" and "far" and you will need to alternately close and open the top of the screen with your palm, waiting for an audible signal or a change in color of the indicator.

It is important to do this in good light, but avoid direct sunlight on the sensor, because a powerful light source can blind the infrared receiver. Once the test is completed, the system will automatically save the new parameters. Restart the device so that the changes take effect.

Settings in a special menu of the developer

In some versions of MIUI, access to fine-tuning the sensor is hidden in the developer menu, which is for advanced users and engineers, but can be useful in our case, so you can force the sensor to turn on or change its logging parameters, which sometimes helps to reset the error.

To activate this mode, you need to quickly click seven times on the build number in the About Phone section. Once you have become a developer, a new item will appear in the main settings menu. Look for the section associated with Input or Sensors where additional switches may be available.

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Before changing the settings in the developer menu, take a screenshot of the current values so that in case of deterioration of the situation, everything can be returned back.

Use of third-party applications for correction

If the built-in system failed to fix the problem, specialized utilities from the Google Play Store come to the rescue. Apps like Proximity Sensor Reset & Test or Sensor Test allow for deeper calibration and have enhanced functionality compared to the standard Xiaomi engineering menu.

These programs often use data averaging algorithms, ignoring short-term reading spikes that can cause "glitches," and they can also force the sensor driver to reset without rebooting the entire phone, saving users time, but be careful to download only high-rated apps that have been tested.

Some utilities offer a “pocket locker” feature that programmatically duplicates the sensor’s performance using accelerometer and gyroscope data. If the physical sensor in the Redmi Note 8 T fails permanently, such a software crutch can be a temporary save, allowing the screen to be locked when carried in your pocket.

Radical methods and resetting settings

When software bugs get too deep and affect system files, it may be necessary to completely reset the device to factory settings.This action will delete all your data, contacts and applications, so be sure to back up important information before starting the procedure.

Resets can be done via the Recovery Mode menu, turn off the phone and press the power and volume buttons at the same time, select Wipe Data and confirm the action in the menu that appears, and after the reboot, the system will be clean, and the setting conflicts should disappear.

⚠️ Attention: Complete resetting will not help if the problem is caused by physical damage to the plume or oxidation of contacts after moisture is ingested.

Also worth considering is rolling back to an earlier firmware version if the problem occurred immediately after the update.Sometimes newer versions of MIUI contain bugs that only fix the following patches.Installing a stable global version through a computer can solve the problem dramatically.

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Resetting to factory settings eliminates 90% of software conflicts, but takes time to recover data and reset the phone.

Frequently Asked Questions (FAQ)