Where is the proximity sensor on Xiaomi Redmi Note 9 Pro: detailed instructions with a photo

The proximity sensor in the Xiaomi Redmi Note 9 Pro is a small but critical element that automatically shuts down the screen during a phone call. When you bring your smartphone to your ear, the sensor registers the obstacle and extinguishes the backlight, preventing accidental pressing and saving battery power. However, over time, this module can fail: the screen does not turn off when you call, reacts with a delay or, conversely, goes out for no reason. If you encounter such problems, the first thing to do is to find the proximity sensor and check its performance.

In this article, we will discuss in detail where the proximity sensor in the Redmi Note 9 Pro (models M2003J6A1G, M2003J6B1G, M2003J6C1G), how to visually identify it among other sensors, and give practical tips on diagnostics, you will learn whether you can replace the sensor yourself, what tools you need, and what to do if the problem is not in the hardware, but in the software. For clarity, we added diagrams, photos of the disassembled smartphone and video instructions.

Xiaomi Redmi Note 9 Pro: where to look for the sensor

In the Redmi Note 9 Pro, the proximity sensor is integrated into the top of the display module, next to the front camera and speaker. This is a typical solution for most Xiaomi smartphones, but there are nuances: depending on the version of the device (global, Chinese, Indian), the location may vary slightly. For example, in models with an infrared port (IR-blaster), the sensor is shifted closer to the center of the upper beze.

Physically, the sensor is a miniature module ~3×2 mm in size, covered with a protective glass. It works on the principle of infrared radiation: it emits an invisible beam and analyzes the reflected signal. If the beam comes back (for example, from an ear or hand), the system understands that the screen needs to be turned off. It is important to note that the proximity sensor is often combined with the light sensor in one chip, which complicates its replacement, but makes it easier to diagnose.

• 📱 Where exactly NOT to look: under the battery, next to the main camera, on the motherboard (the sensor is not soldered separately!).
• 🔍 Visual landmarks: Look for the small circular hole to the left of the front camera (when looking at the screen).
• 🛠️ How to confirm location: light a flashlight – the sensor should reflect light slightly (unlike a microphone or speaker).

Step-by-step: how to find the proximity sensor without disassembly

Before you disassemble the Redmi Note 9 Pro, try localizing the proximity sensor without opening the case. This will only require a flashlight and a magnifying glass (or a macro lens of a smartphone).

1. Clean the top of the screen from dust and protective film – dirt can block the sensor signal.
2. Turn on the flashlight and point the light at an angle of ~45° to the top of the display, and the sensor will look like a tiny black dot or a transparent window.
3. Compare with the photo below (focus on the relative position of the front camera and speaker).

If you can't find the sensor visually, use the test mode of the smartphone.

##6484##

In the menu that opens, select Proximity Sensor, which will show the current values (usually 0 to 5 cm). Close the sensor with your hand, the numbers should change. If there is no reaction, the problem is hardware.

Clean the top frame of the screen

Check visually with a flashlight

Start the test mode (#6484##)

Check the response to closing the hand

Compare with reference values (0-5 cm)-->

Disassembly Xiaomi Redmi Note 9 Pro: access to the sensor approach

If visual diagnostics fail, you'll have to disassemble your smartphone. In the Redmi Note 9 Pro, the proximity sensor is glued to the inside of the display module, so replacing it will require a complete dismantling of the screen, a time-consuming process that requires caution: damage the plumes or disconnect the battery easily, and the consequences can be fatal to the device.

Prepare for disassembly:

• 🔧 Set of screwdrivers (cross-haul) PH00, 1.5 mm flat, plastic shoulder blades).
• 🔥 A dryer or thermoplatform for softening the glue (temperature) ~60–80°C).
• 🧲 Suction cups for screen removal (diameter 5-7 cm).
• 📦 Container for screws (in Redmi Note 9 Pro there are 12 pieces of different lengths!).

Sequence of action:

1. Turn off your smartphone and remove it. SIM-map.
2. Heat the screen edges around the perimeter with a hairdryer (do not direct the air flow to the battery!).
3. Put a plastic blade on the lower edge of the display and gently pull up (use suction cups for even removal).
4. Disconnect the battery and display plumes (they are fixed by latches!).
5. Remove the metal frame protecting the sensors – below it you will see a flexible plume with a proximity sensor.

⚠️ Warning: Don't pull the screen by force, it's connected to the body with thin plumes. If the glue doesn't respond, reheat the problem area. If the display plume is damaged, it will cost 30 to 50 percent of the cost of the smartphone to replace it.

What the proximity sensor looks like: photo and diagram

In order not to confuse the proximity sensor with other elements (for example, with a light sensor or microphone), focus on the following features:

The image below shows the Redmi Note 9 Pro display module on the back, and the proximity sensor is circled in red.

[This should be a photo tagged with a sensor. Example of description: "Photo of the inside of the screen. Left to right: front camera, proximity sensor (red circle), light sensor (yellow square), conversation speaker."]

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If you are taking a screen to replace the sensor, take a picture of the location of all the plumes and screws before disassembly, which will help avoid errors in reverse assembly and prevent "extra" parts after repair.

Checking the operability of the sensor: software methods

If the sensor is externally intact but is not working properly, the problem may lie in the firmware or settings.

1. Testing through the engineering menu: Enter the code ##4636## → select Testing → Proximity Sensor. Close the sensor with your hand - the value should change from 5 to 0. If there is no reaction, try calibrating the sensor (see next paragraph).

Sensor calibration:

adb shell settings put system proximity_delay 0

This command resets the delay, and it requires developer rights and PC connection through ADB to execute it.

Verification through annexes:

• Install CPU-Z or Sensor Test from Google Play.
• Run a sensor test - the application will show whether the approach is recognized.

If the software methods did not help, the reasons may be as follows:

• 🔌 Oxidation of contacts on the sensor plume (cleaned with alcohol).
• 🔧 Damage to flexible cable (requires replacement).
• 📱 Failure of firmware (will help reset to factory settings).

⚠️ Note: After replacing the display module, the proximity sensor may not work properly due to incompatibility of the plumes. Before purchasing a spare part, check with the seller that the module is suitable for your Redmi Note 9 Pro revision (for example, before buying a spare part, M2003J6A1G).

Frequent malfunctions of the proximity sensor and ways to eliminate them

Redmi Note 9 Pro owners often face typical proximity sensor problems, and we've collected the most common symptoms and solutions:

If the sensor is completely out of order, it will cost 800-1500 rubles (depending on the region). Self-repair is advisable only if you have experience - errors in disassembly can damage the display or motherboard.

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Before replacing the sensor, check if the problem is caused by a software failure. In 30% of cases, resetting or flashing through the Mi Flash Tool helps.

Video Instructions: Replace the proximity sensor with the Redmi Note 9 Pro

For clarity, we have prepared a selection of videos, which shows the process of replacing the proximity sensor on the Redmi Note 9 Pro.

• 🎥 Screen disassembly: [Link to video showing removal of display module].
• 🔧 Disconnection of plumes: [Video with emphasis on proper connector extraction].
• 🛠️ Sensor replacement: [A roller soldering new module (for experienced users)].

Before watching the video, please note:

• Use only plastic or wooden tools for disassembly – metal can damage the body.
• If you’re disassembling a smartphone for the first time, practice on a non-working device or watch the full video before you start work.

FAQ: Answers to Frequent Questions About the Approach Sensor