How to Clean the Speaker on Xiaomi Mi 9T: Safe Methods and Step-by-step Instructions

Xiaomi Mi 9T is one of the most popular smartphones of the brand, but even after a few years of operation owners face a typical problem: speakers start to wheez, the sound becomes muffled or distorted. The reason is almost always the same – the accumulation of dust, pile and microparticles in the grille of the speaker. Unlike the flagship models with IP68 protection, the Mi 9T has open acoustic holes that quickly clog.

Many users mistakenly believe that cleaning is enough to blow the speaker with your mouth or wipe with a wet wipe. In practice, this is not only inefficient, but also dangerous: moisture can damage the membrane, and airflow can drive the dust deeper. In this article, we will discuss 5 proven cleaning methods that will return a clear sound without risk to the device. All methods are tested on the Mi 9T and are suitable for the Mi 9T Pro, Redmi K20 and their modifications.

Before you start, make sure that the problem is the pollution, not the software failure. To do this, check the sound through the headphones: if it is clean, then it is the speaker's fault. If the distortion remains, it may be the membrane or contacts that are damaged, and you will need service repairs.

The reasons for the clogging of speakers on Xiaomi Mi 9T

The Mi 9T design predisposes to the rapid accumulation of debris in the acoustic system.

• 🔍 Open speaker grille without protective grid (unlike Mi) 10T s IP53). Dust and pile from clothes penetrate inside when carried in your pocket.
• 💨 The vacuum cleaner effect: when you turn on loud music or calls, the speaker creates a stream of air that pulls particles from the surface.
• 🌧️ Wet environments. Even short-term moisture exposure (rain, sweat) leaves microscopic deposits that attract dust.
• 📦 Packaging and transportation. If you didn't buy your smartphone from a store, you could get the particulates in the speaker.

Interestingly, the top speaker (conversational speaker) clogs less than the bottom speaker (multimedia speaker), which is due to its location: it has less contact with surfaces and clothes, but if you often talk on the phone without headphones, there can also be dirt from the skin and cosmetics.

Preparation for cleaning: what will be needed

Before you clean the speaker, prepare the tools and the workplace. Never use metal objects (needles, pins, knives) - they can damage the membrane or the speaker contacts. Here's a safe set:

Also prepare:

• 📱 Smartphone with a discharged battery on 30-50% (in case a reboot is required).
• 🔦 Lantern (to illuminate the speaker and assess the degree of contamination).
• 🧻 Dry wipes made of microfiber (for the final wipe).

⚠️ Warning: If you use alcohol wipes, make sure they do not contain acetone or other aggressive solvents. The best option is wipes to clean smartphone screens (70% isopropyl alcohol).

Method 1: Scotch cleaning (for pile and fine dust)

It's the easiest and safest way to do this, and it's effective against pile from clothing, animal hair and dust, but it can't handle the old sediments.

Instructions:

1. Cut a piece of tape 3-4 cm long, fold it with a sticky side outside, "loop".
2. Carefully press the tape to the speaker grille without pressing (so as not to drive the garbage deeper).
3. Take a quick move to tear off the tape. Repeat 3-4 times, each time using a new piece.
4. Check the sound by turning on the music at maximum volume.

Cut a piece of scotch 3-4 cm|

I put it on the sticky side outside |

Put it on the speaker without pressing |

He snatched it away (repeated). 3-4 once)|

Checked the sound at max volume.-->

This is especially useful if you're carrying your phone in a jeans pocket or a wool sweater, and the wax from the fabric quickly builds up in the dynamics and creates a cotton-coated sound effect, and Scotch pulls it out through electrostatic attraction.

⚠️ Note: Do not use wide tape (more than 2 cm) - it can hook adjacent parts of the body (for example, a microphone or light sensor).

Method 2: Soft brush + toothpick (deep cleaning)

If the tape didn't work, it means that the debris has accumulated deeper, near the membrane speaker, in which case the combination of a brush and a toothpick will help. The main rule is: don't press the membrane, it is very thin and can deform.

Step-by-step:

1. Take a white brush with a natural pile (synthetics can leave fibers) and carefully run it through the speaker grille in one direction (for example, top-down).
2. If you see large particles (sand, crumbs), put a blunt wooden toothpick on them, and hold it parallel to the phone body so you don't scratch.
3. For hard-to-reach places, tilt the phone slightly (on the 30-45°) And knock on the body next to the speaker, the garbage can fall out on its own.
4. Blow the speaker with cold air from the hair dryer (keep at a distance of 10 cm, the temperature is not higher than 30 ° C).

This method requires patience. Don't try to clean it all in one pass, but repeat the procedure in 10-15 minutes, when the debris has moved away from the vibration.

💡

If you don't have a brush, you can use a new toothbrush with soft bristles, rinse it in warm water and dry it to remove the factory dust.

Method 3: Ultrasonic brush (professional cleaning)

Ultrasonic brushes (such as the Xiaomi Ultrasonic Atomization Humidifier or similar) generate high-frequency vibrations that knock dust out of the speaker without physical contact, the most efficient way, but requires caution.

How to use:

1. Turn on the brush and hold it to the speaker at a distance of 1-2 mm. Do not touch the grille!
2. Hold it for 5-10 seconds, then check the sound. Repeat it if necessary.
3. After the procedure, blow the speaker with a hair dryer (cold air) to remove the remaining dust.

Advantages of the method:

• ✅ Remove garbage from the depths of the speaker, where the brush will not reach.
• ✅ Safe for the membrane (when used correctly).
• ✅ Suitable for cleaning the microphone and speaking speaker.

⚠️ Warning: Do not use an ultrasonic brush for longer than 15 seconds in a row - vibrations can overheat the speaker. Also avoid models with too high frequency (more than 40 kHz), as they can damage the adhesives inside the case.

Method 4: Purging with compressed air (for persistent contaminants)

A compressed air canister (such as cleaning keyboards) can blow garbage out of the speaker, but only when used correctly. Never use a home vacuum cleaner, which creates too much traction and can damage the membrane.

Instructions:

1. Keep the canister vertically at a distance of 5-7 cm from the speaker.
2. Press short pulses (1-2 seconds) to avoid condensation.
3. After purging, let the phone lie down for 10 minutes to evaporate the moisture.

Important: don't tilt the can, it can leak a liquid (solvent) that will damage the speaker, and avoid purging at an angle: the jet of air should go perpendicular to the grille.

💡

Compressed air is effective against sand and crumbs, but useless against sticky deposits (such as from sugary drinks).

Method 5: Disassembly of the phone (extreme case)

If all of the above methods fail, the last option is partial disassembly, a risky process that requires experience and special tools (plastic blades, suction cups, tweezers). Xiaomi Mi 9T has a glue display, and if you open it neatly, you can damage the plumes.

What you'll need:

• 🔧 Torx screwdriver set T3-T5 and Phillips PH00.
• 🧲 Screen suction cup.
• 📐 Plastic blades (to separate the body).
• 🔥 Fryer (for softening glue).

Step-by-step:

1. Turn off the phone and remove it. SIM-map.
2. Heat the screen edge with a hair dryer (50-60°C) for 2-3 minutes.
3. Carefully tuck the screen with a suction cup and plastic spatula, starting at the bottom edge.
4. Disconnect the battery plume, then the speaker plume (it is located next to the charging connector).
5. Clean the speaker with a brush or compressed air. If necessary, rinse with alcohol (no more than 2 drops!).
6. Collect the phone in reverse order, check the sound before final assembly.

⚠️ Attention: Disassembly of Mi 9T without experience is fraught with: - Damage to the display plume (cost of replacement - from 3000 ₽). - Breaking the adhesive layer (requires new glue). - Loss of water protection (if any). If you are not sure, contact the service.

What not to do when cleaning the speaker

Some folk methods can irrevocably ruin the speaker, and this is strictly forbidden:

• 🚫 Blow with your mouth - saliva will fall on the membrane and cause corrosion.
• 🚫 Use needles or pins - they pierce the membrane.
• 🚫 Washing the speaker with water or soap solution will lead to a short circuit.
• 🚫 Clean with a vacuum cleaner – it creates static electricity and can tear out the membrane.
• 🚫 Stick a protective film on the speaker - it blocks the sound and exacerbates the problem.

Also, avoid "advice" about cleaning WD-40 or other lubricants, which corrodes plastic and rubber seals, and then you have to change the speaker.

FAQ: Frequent questions about cleaning the Xiaomi Mi 9T speakers