How to Clean the Microphone on Xiaomi Redmi Phone: The Complete Guide

The problem of quiet, intermittent or completely missing sound when talking on Xiaomi and Redmi smartphones is quite common. Device owners notice that people stop hearing them, complain about noises or the feeling that you are in the aquarium. Before carrying the gadget to the service center, you should try to solve the problem yourself, since in most cases the culprit is banal pollution.

Microphone holes on smartphone cases are very small, making them vulnerable to dust, pile from clothing, pocket fluff, and even skin fat particles. Over time, these microscopic pollutants compress to form a dense plug that physically blocks the access of sound waves to the membrane, regular prevention and proper cleaning can return crystal clear sound.

In this article, we will discuss in detail how to determine which microphone is not working, what tools can be used for safe cleaning, and also consider software methods for solving the problem if it is not the dirt, you will learn how not to damage the moisture membrane and what to do if the software reset does not help.

Diagnosis: Which microphone failed

Modern Xiaomi smartphones are equipped with not one, but two or even three microphones. The main module is usually located at the bottom of the case, next to the charging connector, and is responsible for voice communication. The second, ancillary, is on the upper end and is needed for noise reduction and video recording. The third can be built into the back panel or hidden under the tray SIM-Understanding which element is contaminated is critical to choosing a cleaning method.

You don't need complex devices to make a primary diagnosis. You just need to make a few test calls or records. If you're not hearing well in normal mode, but when you're on speakerphone, it's a great sound, so the problem is in the bottom microphone. If you're not hearing well on speakerphone, or if you're hearing badly, or if you're hearing echoes and bubbles, then the top noise reduction sensor is probably clogged.

The most reliable way to check is to use the MIUI engineering menu, a built-in developer tool that allows you to test each component hardwarely, bypassing standard system settings.

• 📞 Open the Phone app and dial ##6484## to log into the engineering menu (CIT).
• 🔊 In the list of tests, find the item "Main Mic" (main microphone) or "Sub Mic" (additional).
• 🎤 Click on the test and say a few phrases: You should see how the sound level scale responds to your voice.

If the Main Mic scale is barely moving or silent, and Sub Mic is working fine, then it is the bottom of the case that needs to be cleaned, and ignoring this stage can lead to you diligently cleaning the serviceable speaker while the real culprit of silence remains blocked by dust.

Tools and workplace preparation

Cleaning requires not only accuracy, but also the right tools. Using inappropriate items like metal needles or toothpicks can cause permanent damage. Metal can scratch plastic partitions easily, and wood can split and stay inside the hole. Your job is to remove dirt without pushing it deeper and damaging the membrane itself.

The best Redmi service kit is as follows: All of these items are easy to find at home or buy at the nearest electronics and hardware store.

• 🧹 Soft antistatic brush with short pile (ideal for makeup or drawing).
• 💨 Compressed air canister (sold in computer stores) or rubber pear for cleaning optics.
• 🧪 Isopropyl alcohol (medical alcohol 90%+) and cotton-stick.
• 📏 Plastic shoulder blade or dental floss for careful removal of the pile.

Particular attention should be paid to the choice of liquids: it is strictly forbidden to use water, perfume, colognes or alcohol-containing lotions with perfumes. Water causes oxidation of contacts, and various additives can leave a sticky coating that will only aggravate the situation by gluing the dust into a solid lump. Use only pure isopropyl alcohol, as it evaporates quickly and does not conduct current.

Prepare a well-lit workplace. You should use a desk lamp to see the smallest details in the micro-holes. You should cover the desk with light cloth or paper, so you can see the dust and the small details that can fall out of the case during cleaning.

Mechanical cleaning without disassembling the body

This is the safest and first step to begin any repair work. In 80% of cases, mechanical cleaning with external methods allows you to fully restore the microphone on Xiaomi smartphones, the main goal is to soften and remove compressed dust without penetrating deeper than 1-2 millimeters.

Start with dry cleaning. Take a soft brush and thoroughly sweep the dust out of the holes. Movements should be directed from the center of the hole outwards so as not to push the dirt deeper. Then use a can of compressed air. Blow the holes with short, sharp presses. It is important to keep the balloon upright so as not to release condensation that can damage electronics.

If dry cleaning doesn't work, we'll go to wet treatment, and you need to be very careful, soak a cotton swab in isopropyl alcohol and squeeze it very well, and it should be barely wet, and it should not drip any liquid.

⚠️ Warning: Never pour alcohol or any other liquid directly into the microphone holes! the liquid can leak under the membrane or get onto the board, causing short circuit or corrosion of the contacts.

Gently wipe the area around the microphone and lightly touch the edges of the hole with a wet stick. The alcohol will dissolve the fatty plaque, which is often a "glue" for dust. After processing, let the phone lie down for 5-10 minutes for complete evaporation of the alcohol before turning on.

To remove stubborn villi that are stuck in the net, you can use a thin plastic shoulder blade or even a regular dental floss. Carefully tuck the dirt lump and pull it out. Don't pick sharply so as not to break the protective net.

Software methods and resetting sound settings

Sometimes the problem is not physical pollution, but software failure. MIUI or HyperOS operating system may not properly distribute audio streams or work with noise reduction drivers incorrectly. If mechanical cleaning did not work, you should exclude the software factor.

The first thing you need to do is check the permission settings, and some applications can grab the microphone and not give it to other programs, creating the illusion of a breakdown.

• 📱 Go to Settings. → Annexes → All applications.
• 🔍 Find an app that has problems with sound (such as Telegram, WhatsApp, or voice recorder).
• 🛡️ Select "Permissions" and make sure that access to the microphone is allowed and is in "Always" or "Only when using" mode".

The second step is resetting the sound settings and calibration, and in the engineering menu that we talked about earlier, you can start automatically calibrating the microphones, find the Mic Calibration test, and follow the instructions on the screen, and the system will determine the optimal levels of sensitivity.

Also worth checking is whether the feature is "Sound Improvement" or third-party equalizers, which may conflict with system settings. Try disabling Dolby Atmos or Mi Sound Enhancer in the section Settings → Sound and vibration. If after disabling these functions sound improved, then the problem was in the software signal processing, not in the hardware.

In extreme cases, if nothing helps, you can try resetting your settings to factory settings, but before that, make sure to back up the data, as all files will be deleted.

Deep cleaning with the removal of the back cover

If the external methods are powerless and the phone is no longer warranty (or you are willing to risk it), you can try a deeper method. On many Redmi models, the bottom microphone is located on a separate board or plume, which is accessed after the rear cover is removed, which allows you to clean the inlet of the microphone from the inside, where dirt often accumulates as a dense layer.

To do this, you'll need a suction cup, a thin mediator or a plastic card, and a set of screwdrivers (usually a Torx T5 or Phillips) that requires patience, first heating the perimeter of the back cover with a hair dryer or heater to 60-70 degrees to soften the glue.

Then, gently, using a suction cup and a mediator, unplug the lid. Move around the perimeter without making sharp jerks so as not to damage the plumes connecting the lid to the main board (for example, the plume of a fingerprint scanner or flash).

When you take the lid off, you'll see the bottom board, and the microphone is usually protected by a rubber pad or a foam pad, and that's where the compressed down often accumulates.

⚠️ Attention: When removing the rubber mic cap, be very careful. The porous structure of rubber breaks easily with aging. If you break it, the tightness will be broken, and moisture and dust will enter the body.

Clean the microphone hole with a dry brush or toothpick. Often, you can see a black felt filter inside, you can't touch it, you can only clean the inlet in front of it. You can blow the area with compressed air. You can assemble it in reverse order using a new B-7000 glue or double-sided tape to fix the lid.

What to do categorically can not be done

In the pursuit of pure sound, users often make mistakes that turn a small problem into a major repair. There are a number of myths and dangerous tips that circulate online. Following them can lead to a complete failure of the microphone or damage to other components of the Xiaomi smartphone.

First, forget about the vacuum cleaner. The power of a household vacuum cleaner can create static electricity that will kill the sensitive membrane of the microphone instantly. In addition, the airflow can simply push the dust even deeper into the structure of the device.

Second, don't use needles, pins or scissors. Metal objects not only scratch plastic, but they can also break through the thinnest membrane of a microphone or make contact on a board. Even one small scratch on the membrane will produce cod and noise that can't be removed by cleaning.

Third, don't try to blow out the dirt with your mouth. The exhaled air contains microscopic droplets of saliva. Once inside the microphone, they create a sticky film to which the dust sticks dead, and after a week of this cleaning, the microphone will clog even more, but already moist lump of dirt.

• 🚫 Do not use acetone, solvents or gasoline "Kalosha" - they will melt the plastic mesh of the microphone.
• 🚫 Do not heat the microphone with a hairdryer at maximum temperature – the glue inside can leak and fill the membrane.
• 🚫 Do not disassemble the phone if it is on warranty - you will lose the right to free service.

Compliance with these simple safety rules will save your gadget from serious breakdowns. If you doubt your abilities, it is better to stop at the dry cleaning stage or contact the professionals.

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Before you bring your phone to the service, take a photo or video of the current state of sound, record the recorder in a quiet room and on the street, which will help the master to quickly understand the nature of the malfunction and prove that the problem existed before the repair.

Prevention and care of microphones

To prevent the problem of a quiet microphone on Redmi from returning, it is important to follow simple rules of operation: the smartphone is a device that is in constant contact with the external environment, and protecting its acoustic holes is in the interests of the user.

Regularly, every 1-2 months, do a light prophylaxis. Walk a dry soft brush through all the openings of the case. This takes 10 seconds, but prevents the accumulation of a critical mass of dust. If you carry the phone in your pocket of jeans or jacket, the pile of fabric will inevitably tighten inwards when walking.

Using a protective case is a great preventive measure, but there are nuances here. The case must have the right design: the microphone holes in the case must be wide enough and have no sharp edges that could cut the pile off the clothes and push it inside. Deep, narrow channels in bookcases often become dust traps.

Also, try not to put your phone with your screen or underside on dirty surfaces, or put it in pockets filled with small crumbs or dust. If your phone has been in a dusty environment (construction, beach, nature), blow it with compressed air immediately upon your return.

Remember that the microphone is a mechanical component and its life is not infinite. Even with a perfect care in 3-5 years, sensitivity can naturally decrease. However, the right care will allow your Xiaomi to sound clear and loud throughout its life.

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Regular dry cleaning of the holes with a soft brush once a month prevents 90% of the problems with sound, eliminating the need to disassemble the phone or change parts.