How to Clean the Speaker on Xiaomi Mi 9T: From Dust to Water Condensate

The Xiaomi Mi 9T is one of the brand’s most popular smartphones, but even it has a deteriorating sound quality over time. If you notice that the speaker or bottom speaker has become quieter, wheezing or stopped working, the problem most often lies in the accumulation of dust, dirt or moisture. Unlike software failures, physical pollution requires mechanical cleaning – but how to do it correctly without damaging fragile components?

In this article, we will discuss 5 safe ways to clean speakers on the Mi 9T, including auditory (top) and multimedia (bottom) speakers, you will learn what tools you need, how to avoid typical errors (for example, the use of sharp objects) and what to do if water has already got inside.

Important: the cleaning procedure depends on the type of contamination, the dust and pile are removed differently than dried liquid or corrosion, and if the speaker does not work at all, the problem may lie in the contacts of the plume or damage to the membrane, in which case professional repairs will be required.

The reasons for the clogging of speakers on Xiaomi Mi 9T: why it happens

The Mi 9T speakers are protected by a fine metal mesh, but it does not save from dust microparticles, potassium deposits and moisture.

• 🌫️ Dust and pile: get through speaker holes when carrying a phone in your pocket or bag. Especially relevant for users who often put the phone screen down on soft surfaces (sofa, bed).
• 💦 Moisture and condensate: Even if the phone hasn’t sunk, moisture can get in because of extreme temperature changes (for example, when you walk into a warm room from the cold).
• 🧴 Cosmetics and creams: powder particles, tonal cream or lotion clog the speaker's grid if you talk on the phone, pressing it to the face.
• 🔊 Mechanical damage: impacts or falls can shift the speaker membrane, which will lead to distortion of the sound.

The Mi 9T is more likely to suffer from the bottom speaker (multimedia) as it is located next to the USB-C connector, where dust is actively getting into it. The auditory (top) speaker is less likely to clog, but its cleaning is more difficult due to its close proximity to the front camera and sensors.

⚠️ Warning: If the speaker starts wheezing after a phone drop or fluid hits, don't try to clean it yourself, in which case the flexible plume or membrane detachment is likely to be damaged - diagnostics are required at the service center.

Preparation for cleaning: what you will need and precautions

Before you start cleaning, prepare the tools and the workplace.

What can't be done:

• 🚫 Use metal objects (needles, knives, paper clips) – they can scratch a membrane or mesh.
• 🚫 Blow the speaker with your mouth – saliva contains enzymes that can oxidize contacts.
• 🚫 Apply aggressive solvents (acetone, gasoline) - they destroy the protective coating.
• 🚫 Clean the speaker with the phone on – vibration from the sound can drive dirt deeper.

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Before cleaning, back up the data. If you accidentally damage the speaker plume, you may need to flash the phone.

Method 1: Dry cleaning with toothpick and scotch (for dust and pile)

This is a technique that works if the speaker is clogged with dust, sand or pile, but there's no trace of moisture or sticky deposits, and it can be used for both the auditory speaker and the lower speaker.

Step-by-step:

1. Turn off the phone and remove it. SIM-card (if the speaker is near the tray).
2. Take a toothpick and gently, without pressing, run it over the grid speaker along the holes. Don't try to shove it deep!
3. Cut a small piece of tape (5-7 mm wide), fold it with a sticky side outside and lightly press it against the net. Repeat 2-3 times, each time using a new piece.
4. To remove dust from hard-to-reach places, use a soft brush - conduct it perpendicular to the speaker's holes.

If after cleaning the sound has not improved, try to blow the speaker with cold air from the hair dryer (keep at a distance of 10-15 cm so as not to overheat the body).

Is the phone off?|Whether SIM-card?|Do you use soft tools (not metal)?|Check the sound after each stage?-->

⚠️ Attention: if you cleaned your toothpick and it got worse, you could move the speaker membrane, and then you could just take the phone apart from the service.

Method 2: Wet cleaning with alcohol (for fat and sticky deposits)

If the speaker is clogged with cosmetics, potassium fat deposits or sticky substances (such as sugary drinks), the dry method will not help.

Instructions:

1. Soak the cotton swab in alcohol and squeeze it off so it is wet, but not dripping.
2. Gently wipe the speaker grid in the direction of the holes without pressing hard. For an auditory speaker, use a stick with a pointed end.
3. Let the alcohol evaporate (5-10 minutes), then repeat the procedure with a dry cotton swab.
4. If alcohol got inside the speaker, dry the phone with a dryer in cold mode for 10-15 minutes.

On Xiaomi Mi 9T, the hearing speaker is located next to the infrared sensor – avoid alcohol on it, otherwise the Unlock function in the face may be lost.

Method 3: Removal of moisture (if the phone is wet or condensate)

If the speaker is wheezing or not working after water hits, you need to act quickly, and moisture leads to corrosion of the contacts and deformation of the membrane.

Emergency measures:

1. Turn off the phone immediately and remove it. SIM-map.
2. Shake the device (gently!) to get the bulk of the water out. Keep the speaker down.
3. Wet the visible moisture with a paper towel (do not rub!).
4. Put the phone in a silica gel bag (those balls that are put in shoe boxes) for 12 to 24 hours, the alternative is rice, but it is less effective.

After drying, check the sound. If the wheezing is still there, then the moisture is still inside the speaker.

• 🔊 Turn on the phone at maximum volume and play a low-frequency sound (like a bass test on YouTube.
• 💨 Repeat drying with a dryer in cold mode (hot air can melt the glue holding the speaker).

⚠️ Warning: If more than 48 hours have passed since the water hit and the speaker is not working, it is likely that corrosion has begun.

Method 4: Software-based speaker testing (diagnostics before cleaning)

Before you disassemble the phone, make sure it's the pollution that's the problem, not the software glitch.The Xiaomi Mi 9T has hidden tests to check the speakers.

How to start the diagnosis:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that appears, select Audio (or Sound).
3. Press Speaker and listen to the test sound. If the sound is distorted or missing, the problem is the hardware.

An alternative way is to use the Mi Test app (available in Settings → About Phone → All Specifications → Core → Mi Test) and it has a separate test for the top and bottom speakers.

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If the test shows that the speaker is working normally but the sound is still bad, the problem may be the equalizer settings or the plume damage.

Method 5: Deep cleaning with disassembly of the phone (for power users)

If all previous methods failed, the last option is to disassemble the phone, which is a risky option, since on the Mi 9T, the speakers are soldered to the motherboard, and careless actions can lead to a break in the plume.

What you need:

• 🔧 A set of screwdrivers (cross and flat).
• 🧲 Screen suction cup.
• 📱 Plastic blade to disconnect clips.
• 🔥 Fryer (for softening glue).

Step-by-step:

1. Turn off the phone and remove the back cover, suctioning it with a sucker and carefully swiping the shoulder blade around the perimeter.
2. Unscrew the screws that hold the metal plate over the battery.
3. Disconnect the battery plume (to avoid short circuit!).
4. Find the speaker (the bottom is located next to the USB-C, the top is under the front camera) and carefully remove it by unpolding the contacts or disconnecting the connector.
5. Clean the speaker from the inside with an alcohol tampon and blow with compressed air (for example, a can of keyboard cleaning).

If you do the reverse assembly, if the phone doesn't turn on after assembly, check if the battery plume and display are connected.

Frequent Mistakes and How to Avoid Them

Many users make the problem worse by trying to clean the speaker incorrectly, and here are the most common mistakes and their consequences:

If you are not sure of your abilities, it is better to contact the service. On the Xiaomi Mi 9T, replacing the speaker is cheaper than repairing after a failed cleaning.

FAQ: Answers to Frequent Questions