Where is the microphone on Xiaomi Redmi Note 7: detailed diagram and diagnostic instructions

Xiaomi Redmi Note 7 is one of the most popular smartphones in the budget segment, released in 2019. Despite its age, the device is still in active use, but over the years, owners have questions about its maintenance. One of the frequent queries is where the microphone is and why the interlocutor does not hear well during calls. In this article, we will analyze all the nuances of the location of microphones, their purpose and ways to check the health.

The Redmi Note 7 design has three microphones, each of which is responsible for its function: the main one for voice, the additional one for noise cancellation, and the third one for video recording. Their location is not obvious, especially if you've never disassembled a smartphone. We have prepared detailed diagrams, markup photos and step-by-step instructions so that you can quickly find microphones and fix sound problems.

How many microphones in Xiaomi Redmi Note 7 and their purpose

Unlike many budget smartphones, the Redmi Note 7 features three microphones, which provide clearer voice and more efficient noise cancellation.

• 🎤 Main microphone - used for voice calls and recording sound in most applications.
• 🔊 The second microphone (noise suppression) picks up foreign sounds and suppresses them during a conversation, and is located in the upper part next to the speaker.
• 📹 Third microphone (for video) - responsible for recording sound when shooting video. Integrated into the main camera module.

This configuration allows the smartphone to adapt to different scenarios, from calls in a noisy place to recording video with a clear sound, but if one of the microphones fails, the quality of communication or recording can significantly deteriorate.

The exact location of microphones: a scheme with a photo

To avoid guessing where the microphones are, we have prepared a visual diagram. Below is a markup of the case Xiaomi Redmi Note 7 with the exact locations:

Note that the main microphone is often confused with the speaker or the hole for the SIM card. It is a small round hole (diameter ~1 mm) to the left of the USB-C. The second microphone is hidden under the grille of the upper speaker — it is not visible to the naked eye, but it is there.

How to check the efficiency of microphones

If the person complains that they can't hear you well, or if the sound is being recorded with interference, the first thing you need to do is diagnose the microphones.

1. Open the Dictaphone app (or install a third-party one, such as Voice Recorder).
2. Record a few seconds of speech while holding your phone in the normal position (as when talking).
3. Listen to the recording: If the voice sounds quiet or wheezing, the problem is with the main microphone.
4. Repeat the recording by covering the bottom hole of the microphone with your finger, and if the sound is lost, the microphone will work.

To check the noise reduction microphone:

• 📞 Call another phone and turn on speakerphone.
• 🔇 Close the upper grille (near 3.5 mm) with your finger. If the noise in the tube increases, the noise reduction microphone is in good working order.

Recording voices in a voice recorder|Listen to the noise recording|Check the reaction to closing the holes with your finger|Call with speakerphone for noise reduction test-->

⚠️ Warning: If the recording in the recorder is completely absent, but everything works in the calls, the problem may be in the settings of the application or permissions. → Confidentiality → Application authorizations.

Frequent problems with microphones and their solutions

Sound problems on Redmi Note 7 usually boil down to a few scenarios, and let's look at them and how to fix them:

1.The microphone is not working during calls

If the interlocutor does not hear you, but the recording in the recorder works:

• 🔧 Reboot your phone – sometimes resetting temporary errors helps.
• 📱 Check if Do Not Disturb or On the Plane is activated".
• 🛠️ Clean the main microphone hole of dust with a soft brush or compressed air.

Noise or wheezing when speaking

This indicates contamination of the microphone or damage to the membrane.

• 🧹 Clean the hole carefully with a toothpick (not metallic!).
• 💧 If your phone gets in the rain, dry it in rice or silica gel 12.+ hours.
• 🔄 Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.

3.The microphone does not work only in specific applications

In 80 percent of cases, the problem is that there are no permissions or application conflicts. Go to Settings → Apps → [Program name] → Permissions and enable microphone access. If that doesn't work, reinstall the app.

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If the microphone still doesn't work after cleaning, try calibrating it using the engineering menu. To do this, type in ##4636## and select "Audio".

How to Clean the Microphone on Redmi Note 7 in Discrimination

Dust, pile from your pocket or moisture are the main enemies of microphones. To clean them without risking damage, follow this instruction:

1. Preparation: Turn off your phone and get the SIM card.
2. Dry cleaning: Take a soft art brush (or clean toothbrush) and walk gently through the microphone holes. Movements should be light, without pressure.
3. Moisture removal: If the phone is wet, don't use a hair dryer - it can drive the water deeper. Put the device in a silica gel bag (out of a shoe box) for 12 hours.
4. Blowing: A compressed air canister (to clean the technique) will help blow out the dust. Keep the balloon vertically at a distance of 5 cm from the hole.

⚠️ Warning: Never use sharp objects (needles, pins) to clean the microphone! it is almost guaranteed to damage the membrane. also avoid alcohol or liquids - they can oxidize the contacts.

If the problem persists after cleaning, the microphone may have disconnected from the board or failed, in which case you will need to disassemble the phone - you should contact the service center.

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Cleaning microphones regularly (every 3-6 months) prevents 90% of the sound problems on the Redmi Note 7.

What to do if the microphone is broken: repair or replacement

If the diagnosis shows that the microphone is faulty, you have two options:

1. Self-substitution

For Redmi Note 7 microphones are sold on AliExpress or in spare parts stores (cost ~300-500 rubles).

• 🛠️ Setting screwdrivers T3-T5 and plastic mediator.
• 🔥 Hair dryer for softening glue (or special suction cups for screens).
• 🧲 Magnetic cog substrate.

Replacement process:

1. Remove the back cover (carefully tucking the mediator).
2. Disconnect the battery plume.
3. Find the microphone on the board (it is soldered or connected through the connector).
4. Replace it with a new one and assemble the phone in reverse order.

2. Contact the service center

If you're not sure about your skills, you should trust the repairs to the professionals.

⚠️ Warning: Before repair, back up your data! There is a risk of damage to the battery plume during disassembly, which may lead to loss of information.

FAQ: Frequent questions about Redmi Note 7 microphones