Clean the speaker on Xiaomi Mi 9T: 5 proven ways (without the risk of damage)

Xiaomi Mi 9T is one of the brand's most popular smartphones, but over time even it has problems with sound. Dust-filled speakers cause bass distortion, volume reduction or complete disappearance of sound in one of the channels. In 80% of cases, the problem is solved by simple cleaning, but it is important to do it correctly so as not to damage the speaker membrane or protection mesh.

In this article, we will provide detailed instructions for cleaning the Mi 9T speakers (including the Mi 9T Pro model) using improvised tools and professional tools, how to clean the top speaker, the bottom multimedia speaker, and what to do if the sound is lost after moisture is ingested, all methods tested on real devices and do not require a complete disassembly of the smartphone.

Signs Xiaomi Mi 9T speakers need cleaning

Before you start cleaning, make sure that the problem is the contamination, not a software failure or hardware breakdown.

• 🔊 The sound became quieter, especially at low frequencies (bass wheezing or disappearing).
• 🎵 In one of the speakers (usually the bottom) you can hear crackling or hissing.
• 📵 After falling or getting moisture, the sound disappeared completely or became intermittent.
• 🔍 On visual inspection, clusters of dust or fibers of fabric in the lattice are visible.
• 🎧 In headphones, the sound is normal, and from the speakers - distorted (this eliminates problems with firmware).

If one of the points matches, the speakers are probably jammed, but first check the settings:

1. Open the Settings. → Sound and vibration.
2. Make sure the volume slider is at maximum.
3. Turn off Do Not Disturb and features like Adaptive Sound.
4. Try playing the sound in another app (e.g. YouTube instead of Music).

Preparation for cleaning: what you will need and precautions

To clean the speakers Xiaomi Mi 9T does not need rare tools — most of the tools are available at home.

Never use:

• 🚫 Metal objects (needles, knives) – they will pierce the membrane.
• 🚫 Water or liquid cleaning products – ingress of moisture corrodes contacts.
• 🚫 Vacuum cleaner – it creates static electricity, dangerous for electronics.
• 🚫 Cotton swabs or cotton swabs – the fibers will remain inside the speaker.

⚠️ Attention: If Mi 9T If you fall into water or have been vibrated (e.g. in your pocket next to your keys), cleaning may not help, and if you do, you need to be diagnosed for membrane detachment or contact oxidation.

Method 1: Toothpick cleaning (for surface contaminants)

This is the simplest and safest method, and it's suitable for removing visible dust or tissue fibres, and it's suitable for the lower multimedia speaker, because its lattice is wider.

Step-by-step:

1. Take a plastic or wooden toothpick (not metal!).
2. Carefully run the toothpick along the speaker grille in parallel (do not stick it inside!).
3. To remove dust from the corners, slightly tilt the toothpick and run it along the edges of the grille.
4. Repeat the movement 2-3 times, each time shaking the dust from the toothpick.

If the dust doesn't lend itself, lightly moisten the toothpick with isopropyl alcohol (not water!).The alcohol will evaporate quickly and won't damage the speaker.

Use only plastic/wood|Move parallel to the grid|Don't push the membrane.|Remove dust from toothpick after each movement-->

⚠️ Warning: Don't try to prick the grille with a toothpick to "get the dust deeper" - this will cause the membrane to rupture. If the contamination is not removed from the surface, move on to other methods.

Method 2: Scotch cleaning (for deep dust and pile)

Scotch is great at pulling dust and fine fibers out of the speaker because of the sticky surface, and it's good for the upper speaker, where the grille is thinner.

How to properly glue Scotch:

• 📏 Cut a strip of tape 3-4 mm wide (no wider than the speaker grille!).
• 🖌️ Gently glue it to the grille, slightly pressing your finger.
• 🪜 Take the scotch off in a sharp movement - the dust will remain on the sticky side.
• 🔄 Repeat 3-4 times using a new piece of scotch each time.

For better effect, use paint tape, which is less aggressive and leaves no trace of glue. If the sound has not improved after the procedure, combine this method with brushing with a toothpick.

💡

If you don't have scotch on hand, you can use the sticky side of the sticker (for example, from the price tag), the main thing is that the glue is not too aggressive.

Method 3: Purging with compressed air (for hard-to-reach places)

A compressed air tank (sold in electronics stores) blows dust out of the speaker without physical contact, which is the safest method, but requires care.

Instructions:

1. Keep the balloon vertically (do not tilt so as not to splash liquid!).
2. Hold the tube at a distance of 1-2 cm from the speaker grille.
3. With short presses (1-2 seconds) blow the speaker. Don't point the jet at an angle - only perpendicular!
4. Repeat for both speakers (top and bottom).

If there is no balloon, you can use a rubber pear (for example, to blow out the lenses of cameras), the main thing is not to blow with your mouth: moisture from the breath can condense inside the speaker.

⚠️ Warning: Do not use a compressor or vacuum cleaner in blow mode - too much air flow will damage the membrane. The compressed air cylinder has an optimal pressure (about 3-4 bar).

Method 4: Deep cleaning with disassembly (for power users)

If surface methods don't work, you'll have to remove the back cover of the Mi 9T to access the speakers, which is a risky way to do it, which is to damage the plumes or disconnect the battery if you do it, and we recommend it only to those who have already dealt with disassembling smartphones.

Tools required:

• 🔧 Plastic mediator or suction cup to remove the lid.
• 🔨 Screwdriver. T3 (Xiaomi screws).
• 🧴 Isopropyl alcohol and a lilac-free napkin.
• 🔍 Lupa (to inspect contacts).

Step-by-step process:

1. Turn off the phone and remove it. SIM-map.
2. Heat the back cover with a hair dryer (temperature 60-70 ° C) for 1-2 minutes - this will soften the glue.
3. Push the cover with a plastic mediator, starting at the bottom corner (near the USB-C connector).
4. Unscrew 10 T3 screws holding the metal plate.
5. Disconnect the battery plume (use a plastic spatula!).
6. Take out the speakers (they are attached to latches or glue).
7. Clean the membrane and contacts with alcohol, then blow with compressed air.

Critical! On the Mi 9T, the bottom speaker is soldered to the board, which can only be blown out, but not removed. The top speaker is attached to the connector and can be removed.

1. Connecting the battery plume.

2. Integrity of the contacts of the speakers.

3. no short circuit (measure the voltage on the battery with a multimeter).-->

Method 5: Software Diagnostics (if cleaning didn't help)

If the sound has not recovered after cleaning, the problem may be a software failure or damage to the audio driver.

• 🔄 Restart your phone in Safe Mode (click the power button) → long tap on "Switch off» → «Safe Mode Reboot. If it's sound-promoting, it's the third-party app's fault.
• 📱 Reset the sound settings: Settings → System system → Resetting settings → Resetting the sound settings.
• 🔧 Update your firmware to the latest version (go to Settings) → The phone. → Updating the system).
• 🎛️ Check the speakers through the engineering menu: ##4636## → Testing → Audio. → Speaker If there is sound in the menu, but there is no sound in the applications - the problem is in the software.

If none of the methods worked, the reason may be:

• 🔌 Separation of contacts dynamics (requires soldering).
• 🔊 Damage to the audio codec (chip on the motherboard).
• 💧 Corrosion after moisture (needs an ultrasonic bath).

Frequent Mistakes and How to Avoid Them

Many users make the problem worse by doing the wrong thing, and here are the most common mistakes and their consequences:

If you are not sure of your skills, it is better to contact the service. The average cost of cleaning speakers in workshops is 500-1000 rubles, replacing the speaker will cost 1500-2500 rubles (depending on the model).

FAQ: Answers to Frequent Questions