The situation when the screen of the smartphone goes out during an important conversation or, conversely, presses the cheek and does not respond to touch, is familiar to many owners of Xiaomi. In the Redmi Note 10 model, this problem occurs with a frightening frequency, causing a lot of questions from users. Most often, the culprit is a software calibration failure or a conflict of system processes, but physical damage can not be ruled out either.
The proximity sensor is an infrared sensor located at the top of the display that responds to the proximity of foreign objects, and its main task is to turn off the touchscreen during a conversation so that you do not accidentally drop a call or turn on loud communication with your ear. When this mechanism breaks down, the phone turns into an uncomfortable brick that requires immediate intervention.
In this article, we will look at all possible causes of malfunction, from the banal dirt on the screen to the complex problems with soldering the plume. You will learn how to make an accurate diagnosis, perform a hidden calibration through the engineering menu and determine whether it is time to carry the device to the service center.
The main reasons for the failure of the sensor
Before we get into action, we need to understand the nature of the problem: Xiaomi smartphones, including the Redmi Note 10, often “glue” sensors after updating the MIUI operating system. Developers can change the algorithms of signal processing, which leads to desynchronization of sensor readings and real environment.
Another common cause is physical impact: falling a phone, even from a low altitude, could displace the sensor module or damage its plume, and it is also worth considering the protective glass and film: if they are glued curved or have too thick a frame at the top, they simply block access to infrared radiation.
Software conflicts can also be ignored: Call management applications, voice recorders or memory cleaners can intercept sensor control, and system conflict often manifests itself after installing dubious software from unverified sources.
⚠️ Note: If the problem occurred immediately after the replacement of the display or screen, most likely, the wizard poorly glued the frame or used a poor-quality plume.
Diagnostics through the Engineering Menu
The first step for any Redmi Note 10 owner is to check the hardware through the built-in diagnostic menu, so you can eliminate a software bug and see if the system sees the sensor physically, so you don't have to be a programmer, you just have to type in a special code.
Open the Phone app and dial ##6484##. Once you enter the last star, the CIT menu automatically opens. In the test list, find the item associated with the Proximity Sensor, usually at the top of the list or in the Common category.
Click on the appropriate item. You'll see the sensor screen. Hold your palm to the top of the screen (where the speaker is) and remove it. If the numbers change (usually from 0.0 to 5.0 or from Far to Near), then the sensor is physically intact and the problem is in the software. If there is no reaction at all, there is a hardware defect.
- 📱 Value 0.0 or Far: The sensor sees that there is nothing nearby (the screen should burn).
- 🖐️ 5.0 or Near: Sensor detects obstacle (screen must go out).
- 🔄 Blinking values: Possible poor calibration or sensor contamination.
What if the code doesn't work?
Software calibration of the sensor
If the diagnostics show that the sensor is responding but not correctly (e.g., the screen goes out when the phone is on the table), calibration is necessary. This is the process of adjusting sensitivity thresholds. In Xiaomi smartphones, this is done through the same engineering menu.
Enter the proximity sensor test (as described above). At the bottom of the test screen, you will see buttons like "Pass," "Fail" or "Calibrate." Press the calibration button. The system will ask you to close the sensor (close the top of the screen with your palm) and then open it. Repeat the procedure several times until you see a success message.
In some cases, standard calibration doesn't work, so you can try resetting the sensor to factory settings, and then you can do that by pressing the Clear Calibration button on the test menu (if available), or simply restart the device after unsuccessful calibration attempts, and sometimes it helps to repeat the closed-open cycle repeatedly without pressing the buttons until the values stabilize.
☑️ Calibration checklist
Resolve problems after MIUI update
Often, users find that after automatic MIUI updates, the sensor stops working, which is a classic optimization bug. The system may not properly handle sensor interrupts. The first thing you do is try to just reboot your smartphone, which is trivial, but it helps to reset the hanging processes in 30% of cases.
If the reboot didn’t work, check for updates for system components. Go to Settings → About Phone → MIUI version and click on the tri-point in the corner by selecting Update Options. Check for updates for system applications. Also go to Settings → Apps → All apps, find Phone and Services and Feedback, and clear their cache.
In extreme cases, if the problem appears immediately after the update, you may need a full reset (Wipe Data).Remember, a full reset deletes all your photos, contacts and applications, so be sure to back up the data before this procedure.
⚠️ Warning: Don’t try to “sweeten” your phone with custom firmware or older version MIUI This can lead to the “bricking” of the device if you do not have the skills to work with Fastboot and unlock the bootloader.
Influence of accessories and protective glasses
Owners of the Redmi Note 10 often forget that this smartphone has a narrow bezels, and the sensor is located very close to the edge. Any protective glass with a wide black bezel can block the infrared port. Even if the glass appears transparent in this area, the material can block the IR rays.
Check if you have 3D or 5D glass with a darkened upper stripe, try to remove it carefully (if possible without damage), or simply wipe the top of the screen with an alcohol wipe. Fat spots from the ear during conversation can also create a “constant approximation” effect.
High-sided cases are another enemy of the sensor. If the side of the side of the sensor covers the upper end, the sensor may think that the phone is always near the ear. Take off the case and check the sensor's performance in its pure form. If the problem is gone, replace the accessory with a more compatible one.
| Accessory type | Probability of problem | Decision |
|---|---|---|
| Frameless protective glass | Tall. | Replacement with frameless glass |
| Film (hydrogel) | Low. | Wiping the sensor area |
| Side-covered | Medium | Removal of the cover on calls |
| Magnetic holder | Low. | Shifting the ring below the sensor |
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Useful tip: If you use a hydrogel film, make sure it has no air bubbles in the sensor area (above the speaker).
Hardware repair and replacement of the module
When all software methods are exhausted, and the diagnosis of the CIT-The menu shows no response, it's a hardware breakdown. In the Redmi Note 10, the proximity sensor is often integrated into the display plume or is on a separate small board connected to the motherboard.
The most common way is to leave the plume. This can happen due to a shock or factory defect of the assembly. Repair in the service center in this case will be inexpensive: the master will simply reconnect the connector. However, if the sensor module itself burned (for example, from a voltage surge or moisture), it will need to be replaced.
Replacing the sensor on the Xiaomi Redmi Note 10 is extremely difficult. The AMOLED screen is glued around the perimeter, and you need heat and special tools to access the insides. An inept opening is guaranteed to lead to a matrix breakup. Replacing the display costs significantly more than repairing the sensor in the service.
- 🛠️ Symptoms of failure: The screen never goes out or always burns black.
- 💧 Moisture: Water entering the speaker is a common cause of sensor contacts oxidation.
- 🔌 Shoe: When disassembling the phone often damage thin plumes going to the top of the body.
Can I turn off the proximity sensor programmatically?
Why does the sensor only work after restarting?
Does the “In your pocket” mode affect the sensor?
Will resetting to factory settings help?
Where exactly is the sensor on the Redmi Note 10?
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If the calibration and resetting of the settings did not help, and in the engineering menu the sensor does not respond to the palm of your hand, you need to replace the hardware component in an authorized service center.