Redmi Note 10 Pro smartphone owners often experience a screen that goes out or doesn’t respond to a touch to their ears during a conversation, a direct indication that the proximity sensor is malfunctioning or contaminated, and understanding the sensor’s physical location and software nuances is key to fixing most call problems.
Unlike older models, where the sensor was placed under the top speaker, modern Xiaomi devices use virtual sensor technology built directly into the display matrix. This makes finding a visible eye on the front panel impossible, which often confuses users when trying to diagnose. It is important to know that software calibration plays an even greater role here than the physical state of the glass.
In this article, we will take a closer look at where the touch module is inside your smartphone, how to professionally calibrate it through an engineering menu, and what to do if the screen continues to behave unpredictably, how to distinguish a software failure from a hardware failure, and what hidden system features can help diagnose it.
Physical location of the sensor: myths and reality
Many users mistakenly believe that the proximity sensor on the Xiaomi Redmi Note 10 Pro is a small black spot at the top of the screen next to the speaker. In fact, this model uses In-Display technology, where the sensors are integrated into the AMOLED panel itself. This means that the physically active area is under the glass, in the upper center of the display, but not visible to the naked eye.
It is in this area, about the width of 1-2 And if you're reading the distance from the top of the edge, if you're using a black-framed protective glass or a sticker that covers that area, the sensor will be disrupted. It is critical that the area in the center of the top end of the display remains completely clean and free of any foreign coatings.
The technology is based on infrared radiation that bounces off the surface of the ear or cheek, and because the emitter and receiver are hidden under the screen, any contamination, greasy marks, or thick protective glass can distort the signal, leading to false positives where the phone "thinks" it's in the pocket and locks the screen.
- 📍 The sensor is hidden under the matrix at the top of the central part of the screen.
- 🚫 Black protective films with frames often overlap the work of the IR emitter.
- 🧼 Fat spots at the top of the display can cause false positives.
How to check the operability of the sensor of approach
Before you start to do complex calibration manipulations, you need to make sure that the sensor is responsive to external influences at all. There is a built-in engineering test in the MIUI and HyperOS shell that allows you to diagnose the state of all hardware modules.
Open the Phone app and dial ##6484##. The CIT menu will appear on the screen. You'll need to find the "Proximity Sensor" or "Approximation Sensor" item on the list. You'll be in testing mode, where you'll see the current sensor readings. In the normal state, when nothing is closing the top of the screen, the value should be 5.0 (or close to 0 in some versions of the firmware, but more often 5.0 means "far").
Hold your hand to the top of the screen without touching it. If the sensor is working, the value on the screen will change to 0.0 (or "Near"). If the numbers do not change or jump randomly even without obstacles, this may indicate a software failure or calibration need, and it is also worth checking whether the feature "Mode in your pocket" is enabled, which can lock the screen at the slightest dimming.
What if the code doesn't work?
Instructions for calibration of the sensor in the engineering menu
If the test is unstable, the most effective solution is software calibration, a process that trains the memory controller to interpret sensor signals correctly, given the current state of the display and security glass, which is safe and requires no root rights, but requires precise sequence execution.
To start, log back into the engineering menu using code ##6484## and select "Proximity Sensor." You'll see a screen with two buttons: "Calibrate" and "Get Data." The calibration process requires that nothing is less than 20 centimeters away in front of the screen. Make sure you're in a well-lit room, but direct sunlight doesn't fall on the display.
Press the "Calibrate" button. The system automatically records "infinity" (nothing in front of the screen) and "approach" (you will be asked to close the sensor with your hand). Follow the instructions on the screen: when you request to close the sensor, tightly cover the top of the screen with your palm until the indicator changes, then remove your hand. When successful, you will see "Pass" or "Success".
☑️ Checklist of correct calibration
Table of possible states and sensor values
Understanding the numerical values that the sensor gives helps to diagnose the problem more accurately. Different versions of Xiaomi firmware may have slightly different logic, but the basic principles remain the same. Below is a table that interprets the basic states.
| Value/State of the art | Description of the situation | Normal reaction. | Possible problem |
|---|---|---|---|
| 5.0 (Far) | Nothing in front of the screen. | Screen's on. | Norma. |
| 0.0 (Near) | Object close (ear) | The screen goes out | Norma. |
| Racing 0.0 ↔ 5.0 | Trembling hand or dirt | Stable value | Sensor contamination |
| Constantly 0.0. | The screen thinks it's closed. | Reacts to light. | Sticking or marriage |
| Constantly 5.0. | No reaction to the arm. | Changes to 0.0. | Sensor failure |
If you see constant jumps in values for no apparent reason, it often indicates that there are microscopic dust particles or moisture droplets on the surface of the display that refract the IR ray, in which case careful wiping with a microfibre with an alcohol solution helps.
⚠️ Note: If after calibration and careful cleaning of the screen, the values in the test still jump chaotically, it is possible that the problem lies in the hardware plume of the display or the sensor module itself, which requires the intervention of the service center.
Program conflicts and MIUI settings
Sometimes the problem isn't with the sensor itself, but with how the operating system processes its signals. The Redmi Note 10 Pro has conflicts between system updates and third-party apps that intercept call management. For example, instant messengers like Telegram or WhatsApp can use their proximity algorithms to ignore system settings.
It’s worth checking the “In-Pack” settings. This feature is designed to prevent accidental taps, but on models with on-screen sensors it often doesn’t work properly. Turn it off from the Settings → Lock screen menu (the path may vary depending on the version of MIUI). Also check if you have a third-party call management app that may have higher priorities than a standard caller.
Another important aspect is the availability of system updates. Xiaomi regularly releases patches that fix the display drivers. If the problem appeared after the update, maybe there is a bug in the new version, and it is worth waiting for the next patch or, conversely, update if you were behind schedule.
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Useful tip: Try temporarily disabling the “Decline in the face” function in the screen settings to check if this affects the overall stability of the sensor.
Influence of accessories and external factors
Don't underestimate the impact of accessories on high-precision electronics. Wide black-framed security glasses are the main enemy of the proximity sensor on the Redmi Note 10 Pro. The frame closes the sensitivity zone, and the phone constantly gets a signal that it's closed. If you recently changed the glass and the problem appeared immediately after that, the reason is 99% in it.
Cases also play an important role. Some models of book covers or bumpers with high sides can mechanically push the top edge or create a shadow that the sensor perceives as an obstacle. Take off the case and check the sensor in the "naked" form. If the problem is gone, you will have to accept using a less secure option or put up with inconvenience.
Temperature matters, too. If the AMOLED matrix is too hot or too hot, the sensor's characteristics can change temporarily. If you use your phone in the cold, the screen delay when you call can be a normal physical feature that goes away after the device is warmed.
- 🛡️ Remove the black-framed protective glass for inspection.
- 📱 High side covers can cover the upper end.
- ❄️ Extreme temperatures affect sensor sensitivity.
⚠️ Attention: Using cheap protective glasses with a thick adhesive layer can shift the focal length of the IR emitter, which will cause the sensor to stop seeing objects at a normal distance.
Radical methods and resetting settings
If neither cleaning, calibration, or replacement of accessories helped, the last software method is a complete reset, which will return all system parameters to factory values, removing possible software conflicts accumulated during use. Be sure to back up the data before doing so, as all information will be deleted.
You can reset via Settings → About Phone → Reset. Select "Erase All Data." Once turned on, the phone will undergo initial setup. Check the sensor immediately without installing third-party applications. If the problem persists even on a clean system, the probability of hardware failure increases to a maximum.
In rare cases, flashing the device through a computer using the Mi Flash Tool is a complex process that requires an unlocked bootloader and skills to work with the computer. ADB-However, for the average user, this is a redundant measure, and if it has come to this stage, it is wiser to contact an authorized service center for the diagnosis of the plume.
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If a complete reset and replacement of the protective glass does not solve the problem, it is likely that the display module itself or the plume is damaged, and a physical replacement of the components is required.