Replacement of microphone in the smartphone Xiaomi Redmi: a detailed guide with photos and tips

The microphone in the Xiaomi Redmi smartphone is one of those parts that can fail suddenly, whether after a fall, whether due to moisture, or just from time to time. If the interlocutor stopped hearing you, and voice search does not respond to commands, it is probably time to think about replacing. The service center will take from 1,500 to 3,000 rubles for this procedure, but with patience and a minimum set of tools, you can cope with it yourself.

This article will suit the owners of most popular Redmi models of recent years: from the budget Redmi A1/A2+ to the flagship Redmi Note 12 Pro+. We'll figure out how to diagnose a malfunction, find a compatible microphone, carefully disassemble the phone and install a new part, taking into account the nuances of soldering and testing. 80% In some cases, the problem is solved by replacing the lower microphone (it is responsible for the speaker), but sometimes the upper one (for noise reduction) or even a flexible plume is to blame.

Before you start, answer three questions:

1. Is the phone still valid? (If so, better contact the service.)
2. Do you have any experience with small electronics? (If not, practice on an old device.)
3. Are you prepared to suffer if you fail to replace other components? (There is always a risk.)

If the answers didn’t scare you, let’s get started!

How do you know if the microphone is to blame?

Before you disassemble Redmi, make sure the problem is precisely in the microphone, not the software glitch or settings.

• 🔊 Check the sound settings: go to Settings → Sound. → Call quality and make sure that the “Speaker Only” or “Noise Cancel” mode is not activated".
• 📱 Test it in different applications: call WhatsApp, record a voice message in Telegram or turn on a voice recorder. If the microphone doesn't work everywhere, the hardware problem is not working.
• 🔌 Clean the connectors: sometimes oxidation of the contacts on a flexible plume or in the headphone jack blocks the signal.
• 🔄 Reset settings: perform reset via Settings → The phone. → Reset settings (select "Reset Network Settings" or "Reset All Settings").

If the microphone is still silent after this manipulation, it is likely a physical malfunction. 90% of the time, the bottom microphone (located next to the charging connector) fails on the Xiaomi Redmi, as it is more prone to mechanical damage and dust. The top microphone (near the front camera) suffers less often, but it is also worth checking.

For accurate diagnosis, you can use the engineering menu:

1. Open the Phone app and dial ##4636##.
2. Select Phone Information (or Testing on some firmware).
3. Scroll down to the Microphone unit and check the signal levels in a loud conversation. If the band does not respond, the microphone is faulty.

What tools and spare parts will you need?

To replace the microphone in Xiaomi Redmi, you will need a minimum set of tools, but you can not do without some small things.

Now, the most important thing is choosing a microphone. There are three options.

• 🔍 Original microphone: perfect choice, but difficult to find (usually sold only with a flexible plume) Suitable for Redmi Note models 10/11/12 redmi A1/A2+.
• 🛠️ Universal analogue: cheap microphones (from 100) ₽) It's from AliExpress, but the sound quality can be limping. Look for a phone model like the Microphone for Xiaomi Redmi Note 11.
• 🔧 Microphone from donor plume: if you have an old Redmi with a working microphone, you can gently solder it and install it in a new phone.

⚠️ Note: Xiaomi Redmi Note 12 Pro+ redmi K50 microphones are often soldered to the motherboard, not to the plume, in which case you will need soldering using flux and a thin sting of a soldering iron (with a power of no more than 30 watts).

Before buying a spare part, check its compatibility. For example, the microphone from Redmi Note 10 is not suitable for Redmi. 9A, Or look at the article of the detail (you can find it in the disassembly scheme on sites like ifixit.com) or the reviews of sellers.

Refining the phone model (e.g. Redmi Note 11 Pro) 5G)|

Compare the microphone photo with your detail|

Read the reviews on compatibility|

Buy only from sellers with a rating above 95%-->

Step-by-step: disassembly Xiaomi Redmi

It’s not hard to make out Xiaomi Redmi, but it requires care — especially if you’re doing it for the first time.

Step 1 Turn off the phone and remove it. SIM-map.

Turn off the device, wait for the full shutdown (charging indicator should not burn). SIM-card with a paper clip - this will prevent it from being damaged during disassembly.

Step 2. Heat the back cover.

The Redmi body is glued together, so you'll need heat to separate it. Use a dryer (hot air mode) or a thermo-air station (60-70 temperature).°Warm up the edges of the shell around the perimeter for 2-3 minutes.

Step 3. Put the lid on the mediator.

Insert a plastic mediator into the gap between the body and the screen (start at the bottom corner where the charging connector is). Carefully drive the tool along the edge, separating the lid. Do not force! If the lid does not respond, warm up again.

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Step 4. Unscrew the screws.

When you remove the lid, you'll see the motherboard, the battery, and a few plumes, and unscrew all the screws (usually 8-12) with a screwdriver. T3 or T5. Warning: screws may differ in length - remember which one is from!

Step 5. Disconnect the plumes.

Carefully tweez the plume connectors (usually fixed with latches).

• Battery plume (red or black connector).
• Display plume (wide white connector).
• Footprint sensor/camera (if it interferes).

Step 6. Get to the microphone.

The microphone in Redmi can:

• 🔌 On a separate plume (most often - the bottom microphone).
• 🔧 Payable to the motherboard (top microphone or Note 12 Pro models)+).

If you have a microphone on the plume, just disconnect the connector and replace the entire plume. If you have soldered it, read the next section.

Replacement of microphone: soldering vs. replacement of plume

It all depends on how the microphone is installed in your Redmi model, and let's look at both.

Option 1: Microphone with flexible plume (most models)

If the microphone is part of a flexible plume (like in the Redmi Note) 10/11 or Redmi 9A), The replacement process is as simple as possible:

1. Disconnect the plume with the microphone from the motherboard (gently tuck the latch with tweezers).
2. Remove the old plume from the hull.
3. Set a new plume in place, connect the connector to the board.
4. Secure the plume with bilateral tape (usually it comes in the kit).

The cost of such a plume - from 200 to 600 ₽ The key is not to confuse polarity when you connect, the connector must enter effortlessly, if something interferes, check if it is correctly oriented.

Option 2: Microphone soldered to board (Note 12 Pro)+, K50, POCO)

If the microphone is soldered (as in the Redmi Note 12 Pro)+ or POCO F4), It's more complicated, but it's doable with a soldering iron and patience.

Instructions for rations:

1. Remove the shield. The microphone is usually closed with a metal screen - tweez it gently or solder it off (if soldered).
2. Heat the contacts. Use a hair dryer or a soldering iron with a thin sting to melt the solder. Temperatures 250-300.°C.
3. Remove the old microphone. After heating, gently tweez the microphone with tweezers and remove it from the board.
4. Clear the contacts. Remove the remaining solder with a soldering braid or alcohol.
5. Put a new microphone in. Put some flux on it, put it in place, solder the contacts. Don't overheat the board!

Use a solder with a low melting point (for example) for soldering, Sn63Pb37) And flux-based rosifoli. On the Redmi Note 12 Pro+ The microphone is often located next to the antenna tracks - with sloppy soldering, the module can be damaged. 5G!

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If you've never soldered microscopic parts, practice on an unnecessary board. For Xiaomi Redmi, an old motherboard from a router or charger is suitable.

⚠️ Warning: After soldering, be sure to check the short circuit board with a multimeter! connect the probes to the ground (GND) And each microphone contact in turn, and if the resistance is close to zero, there's a circuit somewhere, and the phone may not turn on.

Phone assembly and testing

Once the microphone is replaced, the Redmi is put back together, and it's just as important that one piece of equipment that's not properly connected can actually make the phone go down.

Assembly order:

1. Connect all the plumes to the motherboard (start with the battery, then the display, camera, etc.).
2. Make sure that you have all the screws (make sure that none of them are left over!).
3. Apply new glue to the edge of the case (you can use bilateral Scotch) 3M or special glue B-7000).
4. Press the back cover and warm it up with a hair dryer for better bonding.

Now we're testing the microphone.

• 📞 Call another phone and see if you can hear it.
• 🎤 Record a voice message on WhatsApp or Telegram.
• 🔊 Turn on the recorder and check the quality of the recording (no wheezing or noises should be made).
• 🎵 Test noise cancellation: record the sound in a noisy room and compare it to the recording on another phone.

If the microphone is not working:

• Check if the microphone is properly connected.
• Make sure the contacts are not closed (use a magnifying glass).
• Try resetting your phone to factory settings.

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If the microphone is working after the change, but the sound is quiet or with interference, most likely the problem is poor contact.

Frequent Mistakes and How to Avoid Them

Even experienced craftsmen sometimes make mistakes when replacing the microphone in Xiaomi Redmi, and here are the most common ones and ways to prevent them:

Another common problem is the damage to antenna tracks when replacing the top microphone (for example, in the Redmi Note 12 Pro).+). These tracks are next to the microphone and they're very thin, and if you damage them, the phone will lose the network or it will stop catching. 5G. To avoid it:

• 🔍 Use a magnifying glass with an increase ×10–×20.
• 🔥 Do not overheat the fee for more than 10 seconds in a single approach.
• 🛡️ Close adjacent components with heat-resistant tape.

If the microphone works after the replacement, but there are problems with the network, you most likely damaged the antenna, in which case only professional repairs with the restoration of the tracks under the microscope will help.

Alternative solutions: if the replacement does not help

And sometimes, even after you change the microphone, the problem is still there, which means it's not about the microphone.

• 🔌 The problem with the audio codec is that the chip that handles the sound may have failed (often after a drop or moisture hits) and that requires repair of the motherboard.
• 📱 Firmware failure: sometimes after updating MIUI The microphone stops working. Try to roll back to the previous version or reflash the phone via Fastboot.
• 🔋 Battery problems: If the battery is swelling, it can push on the plumes and break contact. Check the battery - if it's deformed, replace it.
• 🎧 Headphone jack contamination: if the microphone doesn’t work only with connected headphones, clean the connector with alcohol.

If you suspect that the problem is in the audio codec, you can try a temporary solution – use an external one. USB-Microphone with Type-C adapter → USB-A. It’s inconvenient, but it will allow you to use your phone until you find time for a major repair.

To check the audio codec:

1. Connect your phone to your computer and start the program. ADC (Audio Diagnostic Tool).
2. Check the logs for errors such as Audio HAL Mistakes or Mic bias missing.
3. If there are errors, the codec is defective, and without replacing the chip can not do.

FAQ: Answers to Frequent Questions