Location and configuration of the proximity sensor on Xiaomi Redmi 8T

Xiaomi smartphone owners often face a situation where the screen does not go out during a conversation and the cheek accidentally presses the call control buttons. This is a classic sign of malfunction or contamination of the sensor, which must instantly respond to an object approaching the top of the case. Understanding the exact location of this element is the first step to solving the problem, whether it is a software failure or the need for physical cleaning.

In the Xiaomi Redmi 8T, engineers have applied the classic component layout characteristic of drop-screen cutouts. Unlike the flagship lines, where sensors can be hidden under the display or integrated into the finest bezels, they are located at the top of the front panel. Knowing the exact geometry of the location will help you diagnose correctly without disassembling the device, or clean up the contaminated area carefully if the screen has stopped responding properly.

Next, we'll go into detail about the design of the top of the smartphone, the methods of software calibration and how to fix common malfunctions. It's important to understand that the proximity sensor is an optical device that operates in the infrared spectrum, and any obstacles in the path of the beam can distort its readings. We'll look at both the software settings of the MIUI and the physical aspects of the operation of the gadget.

Design features of the upper part of the Redmi 8T

If you look closely at the top of the Redmi 8T display around the front camera cutout, you can see a few subtle elements. It's in this area, often hidden behind a decorative layer or thin film, that the infrared emitter and receiver are located. Unlike the older models with separate ears on top, here the entire touch group is compactly integrated into the design of the front panel.

The challenge for the user is that the sensor can be visually invisible without lighting or zooming in. It's a tiny window through which the IR ray passes. Any pollution, whether it's dust from your pocket, finger fat or remnants of a skewed protective glass, blocks this channel. The optical sensor starts to think that the phone is in your ear all the time, or vice versa, sees no obstruction.

⚠️ Warning: Do not try to pick the sensor area with sharp objects, needles or toothpicks.You risk damaging the delicate infrared filter or scratching the display itself, which will lead to irreversible consequences.

The sensor is positioned strictly symmetrically with respect to the camera's notch, but can be shifted to the right or left depending on the specific revision of the screen array. In most cases, the Redmi 8T has a sensor located to the right of the droplet or directly above the speaker of the conversational speaker. To determine accurately, you can run an engineering menu, as will be discussed below, and observe which area responds to the finger raised.

Software Diagnostics through Engineering Menu

The most reliable way to not only find, but also check the operability of the proximity sensor is to use built-in engineering code. This does not require the installation of third-party applications and gives access to raw data from the sensor. To run the test, open the standard “ringer” and enter the combination ##6484##. If the code is entered correctly, the CIT menu will open.

You'll find a Proximity Sensor item on the test list, which is usually at the top of the list or marked with an icon. Once you enter this mode, you'll see two values: state (far/close) and numerical readings. Put your palm to the top of the screen, the numbers should change and status should switch, and this will confirm that the sensor is physically fit and is exactly where you're looking.

Proximity Sensor Test


State: Far (0) -> Near (1)




Value: 0.0 -> 5.0+

If there is no reaction in this menu, the problem can go deeper, from the plume to the failure of the module itself. However, most often the readings "jump" or do not return to the original state. This indicates the need for calibration. In the same menu, there is often a Calibration button, pressing which triggers an automatic sensitivity adjustment process. During calibration, you can not close the top of the screen with your hands.

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Before starting the calibration, wipe the top of the screen with a soft microfiber dipped in isopropyl alcohol to remove fatty traces that can distort readings.

Physical cleaning and pollution elimination

A common cause of Xiaomi Redmi 8T malfunction is the banal contamination of the sensor area, and over time, dust is stuffed into the micro-holes, and the protective glass, if it is not glued correctly, creates an air cushion or blocks the infrared beam, especially after changing the glass or falling the phone into a dusty environment.

First, try to scrub the top of the display carefully, use a lilac-free fabric and a special tool to clean the screens. If you have a protective glass on top of the display, carefully examine the edges of the display in the area of the speaker. Sometimes the adhesive base becomes cloudy or peels off over time, creating an obstacle to infrared radiation, in which case it helps to carefully trim the glass or replace it with a better one, with cutouts for sensors.

• 🧼 Wipe the screen with an alcohol-containing napkin, paying special attention to the area above the speaker.
• 🔍 Inspect the protective glass for air bubbles or detachments in the sensor area.
• 💨 Gently blow the top of the case with compressed air to knock out dust from the speaker grid.
• 🛠 If the glass overlaps the sensor, consider replacing it with a model with precise cutouts.

It's also important to check if the case is the cause. Some high-sided bumpers can partially overlap the top edge, especially if the phone is on the table, in which case the optical sensor receives false signals from the side of the case, rather than from the user's cheek.

Calibration of the sensor through the hidden menu

If physical cleaning didn't work, it's a software sensitivity setting that's lost, and calibration is the process where you train your phone to understand what's "near" and what's "far away." In Redmi 8T, you can do this without connecting to your computer using that CIT engineering menu.

When you go to the Proximity Sensor, press the Calibration button. The system will ask you to remove all items from the screen. Once confirmed, the phone will record the current reading as a "far away" reference. Then you close the sensor with your hand and confirm the action to record the "close" reference. Once successful, you will see the word Pass or Success.

Sometimes after calibration, you need to reset the settings completely, or at least reset them to take effect, and if standard calibration doesn't work, you can try resetting the calibration data through the resetting process. ADB-commands, but it requires a computer and drivers installed. -n com.xiaomi.cit/.proximity.ProximitySensorActivity It can be used to test if the label is lost.

Effects of protective glass and films

One of the most insidious reasons for proximity sensor problems on the Xiaomi Redmi 8T is poor-quality protective glass. Cheap counterparts often have an opaque black frame that is not geometry-like, and this frame can block the sensor window that is invisible to the eye, even if everything looks flat.

If you have a problem right after you stick a new glass, it's 99% of the time. Try to take the glass out and check the sensor without it. If it works, you'll have to look for an accessory labeled "Full Coverage with cutouts" or "Compatible with sensors." There are also special transparent corrector stickers that are glued over the black frame of the glass in the sensor area, passing the IR beam.

⚠️ Note: Using full black bezel glass on Xiaomi models with top sensors often results in a constant screen burning or inability to complete a call.

In addition, cheap adhesive on the film over time turns yellow or cloudy in the heating area (and the top of the screen is warmed by the processor and speaker).This creates a permanent optical curtain. Regular replacement of consumables or the choice of quality brand accessories will save your nerves and smartphone functionality.

Comparison with other Xiaomi models

Understanding the design of the Redmi 8T becomes clearer when compared to other devices in the lineup. While more expensive models use ultrasonic sensor technology or hidden sensor technology, the Redmi 8T features a classic optical module, which makes it more susceptible to external contamination, but easier to diagnose.

As you can see from the table, optical sensors require a more careful attitude to the cleanliness of the upper part of the case. Owners of the Redmi 8T should be more careful about accessories and regular hygiene of the device. Unlike ultrasonic analogues, there is no complex signal processing, so the physical obstacle will always be a priority over software algorithms.

Frequently Asked Questions (FAQ)

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The exact location of the sensor on the Redmi 8T is the top of the screen next to the camera notch; its proper operation depends on the purity of the glass and the lack of overlapping accessories.

To sum up, the proximity sensor on the Xiaomi Redmi 8T is an important but vulnerable design element. Its location at the top of the screen makes it pollution-proof, but also easy to diagnose. Regular cleaning, the use of quality safety glasses and timely calibration will avoid problems with the screen mode during calls. If software methods and cleaning do not help, you will probably need to replace the module or plume at the service center.