The Redmi Note series has long proven to be a great value for money, but even popular models like the Redmi Note 10 Pro have software failures. One of the most common and annoying problems is the incorrect operation of the touch screen during a conversation. Often users are faced with a situation where the screen goes out on its own or, conversely, does not turn off, and the interlocutor hears only silence instead of your voice.
This is a little module on the top of the case that detects the distance between your phone and your ear, and if it's contaminated, covered by a protective film, or malfunctioning with software, normal call functionality is disrupted, and knowing how to check and configure this component will help you quickly diagnose the problem without going to a service center.
In this article, we will take a look at all the diagnostic tools available, from the built-in tools of the system to the use of the Android engineering menu. You will learn how to distinguish a software glitch from a physical failure, and what to do if the screen has stopped responding to an approach. Proper calibration often returns the device to factory responsiveness in minutes.
Symptoms of malfunction and primary diagnosis
Before we go to complex tests, we need to clearly identify the symptoms. The faulty sensor manifests itself in a specific way that is difficult to confuse with other breakdowns. Most often, users complain that during a conversation, the screen goes out even if the phone is in their hands at a distance of 10-15 centimeters from the face. In other cases, the screen remains on, pressed to the cheek, which leads to accidental pressing of the cheek or ear on the reset or volume buttons.
Sometimes the problem is floating, for example, the phone may work perfectly during the day, but after an incoming call in the messenger or using the navigator, the sensor begins to behave unpredictable, this may indicate a software conflict or overheating of the module, and it is also important to check whether there is a protective film on the screen that covers the area of the sensor.
⚠️ Attention: If you use a thick, black-framed protective glass, make sure it doesn't overlap the top of the display where the sensor is located. Even micro-shifting the film can block the infrared radiation of the sensor. Unlock your phone and hold your hand to the top of the screen without touching it. If the sensor is working, the screen should go out, like when you talk. Remove your hand, the screen will light up. If there is no reaction or it is happening with a long delay, a deeper diagnosis is required. 📱 The screen goes out immediately after the start of dialing, not allowing you to press the speakerphone. 📱 During a conversation, it is impossible to complete the call, since the touch layer does not respond to touch. 📱 When you bring the phone to your ear, the screen continues to glow, causing random taps. 📱 The sensor only works when you press the phone tightly to your face, ignoring the close range. CIT Xiaomi has provided for their devices a powerful diagnostic tool called CIT (This hidden menu allows you to check the health of all hardware components of a smartphone, including an accelerometer, a gyroscope, a camera and, of course, a proximity sensor. Access to this menu does not require root rights and is the safest way to check. To get into the testing menu, open the standard Phone app and enter a special character combination. dial the code ##6484##. If the code is entered correctly, the system will automatically switch you to the testing interface. In some firmware MIUI or HyperOS path may be different: go to Settings → The phone. → The kernel version and press quickly 5-7 If you click on the line "Keronel Version" or "Internal build." If you open the list, look for "Proximity sensor" or "Proximity Sensor." If you click on it, you'll see a screen with numerical values. Put your hand to the top of your smartphone. If the values change (usually from the top of your smartphone). 0.0 before 5.0 or 0 before 1), So the sensor is physically functional and responsive to obstacles, and if the numbers are still there, the problem could be the hardware or the drivers. ☑️ Check through CIT menu Enter the code ##6484##Find Proximity sensor Bring your hand to the screen Check change values Press Pass or Exit: 0 / 5 It is important to note that the menu CIT Calibration function is often available. If the test shows that the sensor is working but is faulty (e.g., it is working too early), you can try calibrating it. To do this, there is often a "Calibration" button on the test menu. It is usually required to close the sensor with your hand, press a button, then remove your hand and press the button again.A check through the Android engineering menu Another level of access to diagnosis is the classic Android engineering menu, which is available on most devices with this operating system. It provides more technical information and allows for tests that are independent of the shell. MIUI. The phone app is also used to enter this menu, and type in the code ##7726## or, in some cases, ##4636##. If the standard codes don't work on your firmware version, you can use a third-party application, such as TestM or Phone Tester, that emulates this functionality. From the menu, select "Sensor" or "Sensors." Here you will see a list of all available sensors. Find "Proximity Sensor". Click on it to see a graph or numerical values in real time. CIT, Here, the data can be displayed in a more raw form. Try to cover the top of the screen with your hand. The graph should show a sharp jump, and the value of "Distance" should change. What if the codes do not work?Some carriers or custom firmware can block the input of engineering codes. Try installing the Engineering Mode Connector app from Google Play or use it. ADB-commands to access hidden functions via a computer. If the sensor is stable and does not respond to hand movements in this menu, while there is a reaction in the CIT menu, this may indicate a conflict of system services. In this situation, cleaning the system cache or resetting network settings often helps. Table of codes and verification methods. For convenience, we systematize the main methods of verification. Different methods can give different accuracy, so it is recommended to go through all the points for complete certainty of the diagnosis. 6 Code/Way Description of action Result of a serviceable sensor CIT Menu ##6484## Select Proximity sensor Change values when you put your hand Engineering menu ##4636##Sensor Data Section Graphic responds to obstacles TestM / Sensor Test Start sensors Green mark"Pass"Visual test Call at 10303030 Bring to the ear during the beeps The screen goes out and lights up The table helps you quickly navigate which method to use in a particular situation. CIT It's not available, you can always use third-party software, and the key is to get repeatable results. 💡Combination of results from CIT menu and third-party applications give the most accurate picture of the state of the hardware-part of the device. If the diagnostics show that the sensor is physically intact but not working correctly (too sensitive or, conversely, "blind"), calibration is necessary. This procedure resets the current sensitivity settings and sets new reference values for "close" and "far away." On the Redmi Note 10 Pro, this can be done in several ways. The most reliable way is through the same CIT menu that was discussed above. Find the "Proximity sensor", press the "Calibration" button. You will be asked to close the sensor (usually the second version appears on the "Placesssssss" on the "sue" button, then you will be removed on the top of the "Calvertation" button, you will see the "s" on the "Secure" button on the "Secure" on the "Secure" button on the "Secure" on the "Secure" on the screen, then the "Secure" button on the "Secure" on the "Secure" button on the "Secure" on the "Secure" Enter the code ##64663## (not working on all firmware) or go to Settings → Advanced settings → Calibration of sensors (the path may differ depending on the version) MIUI). Here you should also follow the instructions on the screen, completely closing and opening the upper face of the device. 📲 Make sure the battery is more than 20% charged before calibration. 📲 Remove the protective case so that it does not create shadows in the sensor area. 📲 Wipe the screen with microfiber, removing fat spots that may distort readings. 📲 After calibration, be sure to restart the device to apply the changes. After restart, repeat the test call. If the problem persists, you may need a more radical intervention in the software part or a replacement of the module. Sometimes the problem is not with the sensor itself, but with the software that is not handling the sensor’s signals correctly, often after you update the system or install applications that access the phone. In such cases, it helps to reset or clear the cache. First step, try to clear the cache of the Phone application and system services. Go to Settings → Annexes → All apps, find "Phone", "Google Play Services" and"MIUI". Press "Clear" →"Clear cache. Don't worry, it won't delete your contacts or call history, but it can fix bugs in the communication modules. ⚠️ Note: Full data cleanup of the Phone application can delete your call history. It is recommended to back up important numbers or sync them with your Google account beforehand. If cleaning the cache didn't help, reset all settings to factory.Be sure to back up your data in the Xiaomi Cloud or on your computer before doing so. Once reset, the phone will go back out of the box, and if the problem was software, it will disappear. 📊 How often do you have a bug sensor approach?Constantly, infuriatingSometimes, after updates Only in the case Never encountered Not at all use calls In rare cases, it helps to disable the function "Smart response" or other control gestures that may conflict with the sensor. Check the Settings section → Passwords and security → Confidentiality and disable suspicious screen-related features Hardware issues and module replacement If neither calibration, resetting, nor flashing has worked, hardware malfunction is likely to occur. On the Redmi Note 10 Pro, the proximity sensor is often integrated into the screen plume or part of the front panel, in some versions it is a separate small module, in others it is part of a complex system, and moisture is a common cause of failure. Even if the phone didn't sink, high humidity or condensation can oxidize the contacts of the sensor, and the sensor could fail due to impact when falling, which is visually difficult to determine, requires disassembly of the device. Replacement will require a new sensor or plume module (depending on the design of your board revision) and requires fine electronics skills, a heating table (or hair dryer) to peel off the screen and special tools. Self-substitution without experience can damage the display or battery. 💡When buying spare parts, pay attention to the article. There are different versions of the screens for the Redmi Note 10 Pro (AMOLED from different manufacturers), and the sensors in them may differ in the sizing. If you are not sure of your abilities, you should contact an authorized service center. They will conduct an accurate diagnosis with a multimeter and replace the faulty component with a guarantee. Remember, opening the case deprives you of an official warranty. Why does the sensor work normally in the test menu, but glitches when calling? This is a classic sign of a software conflict. Most likely, a third-party application (for example, voice assistant or memory cleaner) intercepts control of the sensor, without giving it a safe run from the system during the operation of the system, if you can safely start it in the system in the system in the system. You can't turn off the proximity sensor with MIUI, because it's a system component. However, there are applications like "Proximity Sensor Reset Fix" or "Lesser Notification" that can emulate the sensor or block it from turning off the screen. Also, some custom firmware (Custom ROM) allows you to turn off the sensor at the core level, but this requires unlocking the bootloader and obtaining root rights. Does the magnetic case affect the sensor? Yes, magnetic bookcases can affect the sensor if the magnet is too close to the infrared part of the screen and can check the sensor for "Finding" in the upper part of the sensor and "Proximity" to detect the sensor. There are a lot of apps on Google Play that have names like "Proximity Fix." Most of them just run the calibration procedure that's already on the engineering menu, or change sensitivity thresholds through system commands. They can help if the software calibration is lost, but they're useless if there's a physical breakdown. Be careful: these apps often require a lot of permissions and may contain ads. Will the phone's firmware reflashing (changing region or installing global firmware instead of Chinese, or vice versa) help in 60% of cases if the problem is caused by bugs of a particular version of software. However, if the sensor is physically contaminated or if the factory does not always start with a defect.