How to test a speaker on Xiaomi Mi 9: from basic verification to deep diagnostics

Speaker in Xiaomi Mi 9 is a critical component that affects the quality of calls, voice commands and even the performance of some applications. If the interlocutor complains that he can not hear you, or you notice yourself a distortion of the sound, it is time to conduct a diagnosis. Unlike multimedia speakers, the conversational (aka "top" or "audible") often fails due to moisture, mechanical damage or software failures.

Many users confuse problems with the speaker and the microphone — these are different nodes, and you need to test them separately. In this article, we will discuss methods for checking the speaker (the one used during calls), and also touch on the accompanying nuances: how to distinguish hardware from software malfunction, what tools to use for accurate diagnosis, and what to do if the speaker really does not work. Some tests can be done without additional devices, others will require connection to a PC or use service codes.

Let's just say, if you've never disassembled a smartphone, you shouldn't try to clean or repair the speaker yourself. 90% of the malfunctions of this node in the Mi 9 are due to oxidation of contacts or damage to the membrane - both require professional intervention. However, preliminary diagnosis is not only possible, but also necessary: it will save time and money when you contact the service.

Basic Test: How to Hear a Speaker in Action

Before you get into the technical details, make sure the problem is really the dynamics. On the Xiaomi Mi 9, the speaker is located at the top of the screen (near the front camera), its main function is to play the voice of the interlocutor during calls, as well as the sounds of notifications in the “in-listener” mode.

To test the speaker without a call, follow the following steps:

• 📞 Call another phone. Call the Mi 9 on any other device and ask the person to talk. Put the top of the smartphone to your ear, the sound should be clear, without wheezing or interrupting. If the voice is heard only from the bottom speaker (multimedia), the conversational speaker does not work.
• 🔊 Speak-of-mouth. Turn on speakerphone when you call, then turn it off. If you don't get the sound back into the speaker, it could indicate a software failure.
• 🎵 Playback of the recording. Record the voice message in the recorder and play it through the speaker. To do this, select the player option "In the listener" (if available).

Pay attention to the nature of the sound:

- Quiet sound - possible clogged speaker with dust or damage to the membrane.

Wheezing/distortion is a sign of contact oxidation or mechanical wear.

- Lack of sound - either a speaker malfunction or problems with the plume / motherboard.

If the sound is completely missing, move to the next section. If there is a distortion, try clearing the speaker (more on that below).

Verification through the engineering menu: service codes for diagnostics

The Xiaomi Mi 9 (like other smartphones on the Qualcomm Snapdragon) supports access to the engineering menu through service codes, which will allow you to test the speaker at the hardware level, bypassing software restrictions.

To enter the engineering menu:

1. Open the Phone app.
2. Enter the code ##36446337## (or alternative #4636###).
3. Select the Hardware Testing option → Audio.

In the Audio section, find tests for:

- Receiver (talk speaker),

- Earphone (earphones),

Speaker (lower multimedia speaker)

Run the Receiver test. If the speaker is working, you'll hear an audible signal. If there's no sound, it's a hardware problem. If there's sound, but the speaker isn't working normally, it's the software.

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If the engineering menu doesn't open, try entering codes through the Dialer app (e.g. Simple Dialer from Google Play). MIUI block out the standard set.

In addition, in the engineering menu, you can check the levels of the microphone signal (it is useful if the interlocutors do not hear you well). To do this, select a Microphone and talk to the microphone - the screen should display a graph of sound waves.

3. Software tests: applications for sound diagnostics

If service codes don't work, or if you prefer a more visual interface, use specialized applications that allow you to test the speaker with signal level visualization and distortion detection.

Top.-3 applications for testing the speaker on Xiaomi Mi 9:

• 📱 Phone Doctor Plus is a free app that tests all components of a smartphone, including speakers and microphones, and then it comes up with a report that says "Passed" or "Failed".
• 🔊 SoundAbout – allows you to manually redirect the sound to the speaker speaker (useful if it does not turn on automatically).
• 🎛️ Audio Test – generates test signals of different frequencies, helping to identify distortions in the dynamics.

Instructions for using Phone Doctor Plus:

1. Install the app from Google Play.
2. Run the Speaker test.
3. Select Earpiece (Conversational Speaker).
4. Follow the instructions on the screen – the app will play the sound and ask you to confirm if you hear it.

If the app shows an error, but there is sound in the engineering menu, the problem may be in the settings. MIUI. Try resetting the sound settings: Settings → Sound. → Resetting settings.

Remove the cover (it can block the speaker)

Turn off Bluetooth headphones

Turn up the volume to maximum

Close the background annexes-->

Physical inspection: cleaning and visual inspection

A common cause of poor performance of the speaker is dust clogging or moisture. On the Xiaomi Mi 9, the speaker is protected by a grid, but over time it clogs, resulting in a muffled sound.

To clean the speaker:

1. Take a soft toothbrush (new or clean) with a short pile.
2. Carefully, without pressing, brush the speaker along the mesh (not across) so as not to damage the membrane.
3. To remove moisture, use silica gel (packages from shoeboxes) - put your smartphone in a sealed bag with silica gel for 12-24 hours.

Never use compressed air (cylinders) to clean the Mi 9 speaker - this can damage the membrane due to high pressure. Also avoid cotton swabs: they leave the fibers and can push dirt deeper.

Visually examine the speaker for:

- Bloating or deformation of the mesh (a sign of moisture).

- Scratching or denting (mechanical damage).

Oxidation (green or white coating on the contacts, visible during disassembly).

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If after cleaning the sound is not restored, and visually the speaker looks good, the problem is most likely in the plume or motherboard.

For deep cleaning (for example, after getting liquid) will require dismantling of the smartphone. If you are not sure of your skills, it is better to contact the service. The cost of replacing the speaker on the Mi 9 in 2026 – from 800 to 1500 rubles (depending on the region and service).

5. Checking the plume and contacts: when the problem is not in the dynamics

If all the tests show that the speaker is working, but there is no sound, the plume connecting the speaker to the motherboard may be to blame. On the Xiaomi Mi 9, this is a common problem after falling or disassembling the smartphone.

Signs of a plume malfunction:

The sound appears only at a certain position of the smartphone (for example, if you press on the top).

The speaker works periodically (i.e., not).

Together with the speaker stopped working proximity sensor or front camera (they are connected to the same plume).

It is difficult to check the plume without disassembling, but you can try the following method:

1. Carefully press on the top of the screen (near the speaker).
2. If the sound appears, the plume has moved or damaged.
3. Try to bend the body slightly in this place (no fanaticism!) If the sound disappears / appears - a problem in the contacts.

In service centers, the plume is checked with a multimeter (contact vertebrae). If a cliff is confirmed, the plume will have to be replaced. The average cost of work is 1000-2000 rubles (plus the price of a spare part).

⚠️ Warning: Don't try to disassemble the Mi 9 yourself if you don't have experience.The case of the smartphone is glue, and the plumes are fragile - if you do not slouchy open it, you can damage the screen or motherboard.

6. Checking after upgrade or reset: software glitches MIUI

Sometimes the speaker stops working after the update. MIUI It's due to firmware errors or setting conflicts, and here's how to diagnose and fix these problems:

Step 1: Check the sound settings

Go to Settings. → Sound. → Volume and make sure Media slider and Call are not at zero. Also check if Do Not Disturb or No Sound mode is activated.

Step 2: Reset your network settings

Sometimes the sound problems are due to the errors of the communication module. → SIM-maps and mobile networks → Resetting network settings.

Step 3: Reverse the update (if the problem occurs after the update)

If the speaker is working before the update MIUI, Try to go back to the previous version:

1. Download the old firmware from the official Xiaomi website (section Mi 9, cepheus encoding).
2. Go to Settings → About Phone → System Update → Three Dots (menu) → Select a firmware file.
3. Select the downloaded file and wait for the process to be completed.

If the rollback does not help, perform a full reset via Settings. → The phone. → Reset settings. Pre-reverse the data!

7.When to contact the service: signs of serious malfunctions

Not all problems with the speaker can be solved on their own, but here are the signs for which you should immediately contact the service center:

• 🔥 The smartphone overheats when trying to reproduce sound through the speaker - this may indicate a short circuit.
• ⚡ The sound is accompanied by electrical interference (cracking, as from a “breakdown”) – a sign of power problems.
• 🛠️ The speaker worked, but stopped after falling or getting moisture - the probability of mechanical damage is high.
• 🔌 Other components do not work (front camera, proximity sensor) - a problem in the plume or board.

Average repair prices in 2026 (for Xiaomi Mi 9):

• Replacement of the speaker: 800-1500 rubles.
• Replacement of the plume: 1000-2000 rubles.
• Cleaning from oxidation: 500-1000 rubles.
• Repair of audio track on the board: 2000-4000 rubles.

Before the service visit:

1. Make a backup copy of the data (in case of a reset or replacement fee).
2. Write down when and after the problem occurred (this will help the wizard diagnose the malfunction more quickly).
3. Check the warranty – if the smartphone was purchased officially, the repair may be free.

⚠️ Warning: If the Mi 9 has been in contact with the fluid, do not turn it on until it is completely dry (at least 48 hours).Attempting to turn it on can cause a short circuit and damage the motherboard.

Frequently asked questions