The proximity sensor Xiaomi Redmi Note 8 T: what to do and how to fix

The Redmi Note 8 T screen that doesn't go out during a conversation is familiar to many owners of budget and mid-range smartphones. You put your phone to your ear, but the display keeps burning, your cheek resets calls or opens random apps. It's not just an annoying bug, but a serious problem that interferes with full communication and consumes battery power. Most often the reason lies in a software calibration failure or sensor contamination, but in some cases you need to interfere with system settings or even hardware repairs.

In this article, we will take a look at all the possible reasons why the Xiaomi Redmi Note 8 T proximity sensor is not working, and offer step-by-step solutions. We will look at both simple actions like cleaning the screen and complex manipulation of the engineering menu. Understanding the nature of the malfunction will help you save time and money by avoiding unnecessary trips to the service center.

Main causes of malfunction and primary diagnosis

Before you start complex manipulations, you need to rule out the trivial physical reasons. The proximity sensor in the Xiaomi Redmi Note 8 T is located at the top of the screen, often hidden under the protective glass. If dust accumulates on the surface, greasy spots from the fingers or glue residues from cheap protective glass, the sensor can go blind. Even a microscopic crack in the logo area can disrupt the infrared emitter. The sensor is sensitive to any obstacles, so visual inspection is the first step.

The second common cause is software conflict: After updating the MIUI operating system or installing a new launcher, the sensor settings may get lost, and third-party applications that intercept screen or call control also influence the sensor, such as smart call blockers or conversation recording apps sometimes conflict with the standard phone module, in which case the system simply stops receiving correct distance data to the object.

⚠️ Note: If you have recently changed the display or protective glass, make sure that the master used a high-quality copy with the right cutouts for the sensors. Cheap analogs of glasses often have a darkened area that blocks the IR beam.

The third factor is magnetic cases. Some owners use accessories with a magnetic fastener or metal inserts. The magnetic field can (interfer with) the sensors, although in the Redmi Note 8 T this problem is less common than in the old models. However, remove the case and check the phone in the "naked" form. If the problem is gone, it was the accessory.

⚠️ Warning: Do not use alcohol or aggressive chemicals to clean the sensor area.This can damage the oleophobic screen covering. Use microfiber and special screen tool.

To quickly test the sensor, you can use a built-in engineering test to see if the module sees objects at all, or if the problem is only software processing, if the sensor responds but doesn't, the software is a problem, if it doesn't respond anywhere, the train may have gone off or the component itself failed.

Calibration of the sensor through the CIT engineering menu

The most effective way to solve this problem is by force calibration, and in the MIUI shell, there's a hidden CIT (Customer Integration Test) menu designed to diagnose all the modules in a smartphone, and that's where you can reset your current readings and retrain your phone to determine the proximity of objects, which helps in 80 percent of software failures.

To enter the menu, you need to open the standard Phone app and type a special code. Once you enter the last digit, the menu will open automatically. If the code does not work, your firmware version may block this access, and then you will have to look for alternative ways through the developer's settings. But in most cases, the code for the Redmi Note 8 T works flawlessly.

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When you open the menu, you'll see a list of dozens of tests, and you'll find a item called the Proximity sensor or the Approximation Sensor. It's usually at the top of the list. Click on it. You'll see a window with two digits: Value and Max. Your job is to get the value changed when you put your hand up.

⚠️ Warning: Do not press the Pass button until you have made sure that the sensor is working correctly.

The calibration process is as follows: first, remove your hand from the top of the phone so that the value in the Value column becomes minimal (usually 0 or 5). Then close the top of the screen (where the speaker is) tightly with your palm and hold the value for 2-3 seconds. The value should rise. Then remove your hand again. If the numbers change, press the Calibration button or simply complete the test with the Pass button.

System settings and parameter reset

If the calibration didn't work, it's worth checking the basic settings of the system. Modern versions of MIUI have features that can conflict with the sensor's performance, such as In-Pack mode or various screen gestures, and disabling these features helps to identify a software conflict.

Go to Settings → Lock screen and find Mode in your pocket. Try turning it off. Also, look at Settings → Advanced Settings → Special features. This can activate features for people with disabilities that change the logic of the sensors. Make sure that nothing interferes with the standard operation of the module.

Another effective method is to reset your settings to factory settings without deleting your personal data (although a full reset is more reliable), before you do so, make sure to back up your contacts and photos. Resetting will bring all system settings, including sensor drivers, back to baseline, eliminating errors that have arisen after failed updates or experiments with root rights.

Once reset, the phone will look like new. Don't rush to install all the apps at once. Check the sensor on the clean system. If it works, there was a problem with one of the installed applications. If not, we're diagnosing deeper. Often, memory cleaner apps or antiviruses that have access to screen control are the culprits.

Use of third-party applications for calibration

Xiaomi's built-in tools don't always solve the problem. If the CIT factory menu doesn't work, third-party utilities from the Google Play Market come to the rescue. They use more aggressive calibration algorithms and can rewrite system configs where the standard interface is powerless. One of the most popular and proven applications is "Proximity Sensor Reset/Fix."

The way these programs work is simple: they force the system process that controls the sensor to stop and they retrain, so you have to close the sensor with your hand, then open it, and the application will give you a message of success, and then you have to reboot the device, and without rebooting, you don't have to use the new parameters.

But be careful. Some applications require advanced access rights or even root rights. If you don't have experience with ADB or superuser rights, you'd better limit yourself to simple utilities that work in user mode. Incorrect calibration can cause the screen to stop going out altogether or, conversely, go out without a phone in your ear.

Hardware problems and repairs with their own hands

When software is exhausted, you have to talk about hardware. In the Redmi Note 8 T, the proximity sensor is integrated into the display plume or is on a separate board glued to the body. A common problem is the plume's drift away when it falls. Even if the screen is intact, a microscopic shift of the connector inside the body causes the sensor to lose contact.

You have to take the back cover off to check. This requires care, because the cover is glued. Heat the edges of the phone with a hairdryer or on a heating stove to 60-70 degrees, then use a suction cup and a mediator to unplug. After you turn off the battery, inspect the plumes. The proximity sensor connector is usually located next to the charging socket or the top of the board. Try to gently reconnect it.

Another reason is that the sensor itself failed, and it could have burned out from a surge in voltage or moisture, and in this case, only a replacement will help. Fortunately, for the Xiaomi Redmi Note 8 T, parts are available and inexpensive. Replacing the sensor is a procedure for power users that requires soldering or replacing the entire plume.

⚠️ Warning: Self-opening your phone automatically takes you out of warranty.If the device is warranty, take it to an authorized service center, even if the problem seems simple.

Sometimes the problem is a bloated battery, and if the battery is inflated, it can push the internal components, moving the sensor or squeezing the plumes. Visually, this may not be noticeable without removing the lid, but the phone may be slightly arched. Check whether the phone is tight on a flat surface. If it is swaying like a yula, the battery needs to be changed immediately.

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When disassembling the phone, use only plastic tools (scapula, mediators). Metal tools can short contacts on the board and finally kill the smartphone.

Prevention and long-term solutions

To prevent the Xiaomi Redmi Note 8 T proximity sensor from coming back, it is important to follow certain operating rules. Rub the top of the screen regularly. If you use a protective glass, choose models with a black bezel that does not overlap the sensor area, but also does not have a thick layer of glue in this area.

Also watch for system updates. Xiaomi periodically releases patches that fix sensor drivers. However, be careful with MIUI betas - they often contain bugs. If after the update there is a problem and no rollback is possible, sometimes waiting for the next stable patch or flashing the device through the computer with all data clearing helps.

As a temporary crutch, if repair is not possible, you can use the Voice Answer function or the headset connection, but this does not solve the problem completely. If nothing helps, and you need to call, you can install an application that blocks the screen with a power button during a conversation, although it is inconvenient.

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In 90 percent of cases, the problem is solved by calibrating through the CIT engineering menu or replacing the poor-quality protective glass.

Frequently Asked Questions (FAQ)