The modern Xiaomi Redmi 5 is a complex technical device, where each element has its own specific place. Users often face a situation when you need to understand exactly where the main microphone is to clean it from dust or diagnose a problem with recording sound. Misunderstanding the design of the gadget can lead to attempts to disassemble in unnecessary places.
In this article, we will take a closer look at the audio architecture of this model so that you can pinpoint the location of the recording modules, understand the physics of the location, and avoid damage to the body during cleaning, and discuss the software aspects of the sound path in the MIUI shell.
It's important to note that the design uses different types of microphones for different tasks, the main device is on the bottom end and the auxiliary is on the top end. The main microphone in Redmi 5 is integrated into the charging port plume, making it more difficult to replace than models where it is soldered on the board, a critical technical feature that affects the cost and complexity of repairs.
Physical location of the main microphone
The main recording module in Redmi 5 is at the bottom of the case, and if you flip the smartphone over the screen to your side, the microphone hole will be located to the right of the USB Type-C connector (originally Micro-USB) and to the left of the speakerphone, it looks like a small circular hole in the frame or bottom panel.
Inside the case, this microphone is mounted on a special rubber seal that presses against the hole in the case to ensure leakage, and through this hole, the sound enters the sensitive membrane, and if you notice that people are not hearing you well, the first thing you need to check this area for contamination.
Often users confuse this hole with a hole for a clip extraction. SIM-The speaker in Xiaomi Redmi 5 has an oblong grille, and the microphone is a single dot. Be careful when cleaning, so as not to damage the speaker grid, thinking that cleaning the microphone.
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Use a soft brush to clean the microphone hole, avoiding sharp metal objects that can damage the membrane inside the case.
Structurally, the module is a miniature electronic component that is soldered to a board or a plume. In the case of Redmi 5, as mentioned earlier, it is often part of the bottom plume, which means that this particular node suffers from mechanical damage (for example, after a phone falls downwards).
Upper microphone and noise reduction system
The second, the auxiliary microphone, is located on the top end of the smartphone, and it's necessary to implement noise reduction technology when you talk, so when you hold the phone to your ear during a call, the main microphone takes your voice, and the top one analyzes background noise.
The signal processing processor in Redmi 5 compares data from two sources and cuts off extraneous sounds, leaving only the clean speech of the interlocutor. If this upper microphone is contaminated or closed with a cover, the quality of communication can deteriorate dramatically even with a serviceable lower module.
The top microphone hole is usually next to a 3.5mm headphone jack or infrared port, visually smaller than the main one and often protected by a grid, and it's important to make sure that when you're carrying your phone in your pocket, the pile of fabric doesn't clog the hole.
The system works automatically, but its effectiveness depends on the physical integrity of both channels. If you use speakerphones, the phone can use both microphones to create a stereo effect or improve the direction of the recording, so the state of the upper end is just as important as the lower end.
Diagnostics of the serviceability of the microphone
Before you take the device into the service or disassemble it, you need to conduct a software diagnostic. In the shell MIUI installed on the Xiaomi Redmi 5, there is a built-in engineering menu to check all the components, this is the most reliable way to know whether the hardware works.
To enter the test mode, you need to open the Phone app and type a special code. Once you enter the combination, the CIT menu will open. In this list, you need to find the item associated with the microphone (usually called Main Mic or Top Mic).
The command to enter the engineering menu:
##6484##Once you've selected the microphone test, the phone will ask you to say a phrase or blow into the hole, and it will show the signal level in decibels or the visual scale, and if the scale responds to sound, then the module is physically healthy and the problem lies in the software or application settings.
☑️ Microphone check.
If the engineering test doesn't sound at all, or if it's very quiet and intermittent, it indicates a physical malfunction, it could be oxidation of the contacts after moisture hits or a plume break, and then software methods are probably not going to help.
Software settings and permissions
Often the problem with a broken microphone is not hardware, but software. Android and MIUI tightly control the applications' access to the audio recorders, and if you installed a new messenger or voice recorder, it might not have obtained the necessary rights.
Permissions are checked through the settings menu, so you have to go to the application management section and find a specific program, and there has to be permissions, where you have to activate access to the microphone, and without that, the app just can't capture audio.
The path to permission settings:
Settings → Applications → All Applications → [Select App] → Permissions → MicrophoneAlso worth paying attention to is Do Not Disturb mode or special sound profiles. Sometimes enabling certain scripts blocks sound recording in background applications. In addition, third-party memory cleanup programs can aggressively unload the processes responsible for the audio track.
⚠️ Warning: Third-party voice recorder applications may conflict with the system recorder. If the system recorder works and the third-party recorder does not, the problem is access rights or battery optimization.
Another important aspect is the system update: Older versions of MIUI for Redmi 5 have encountered bugs when certain applications have lost sound after the update, and checking for firmware updates can resolve the driver software conflict.
Table of common faults
For quick orientation, use the summary table to help classify symptoms and determine the most likely cause of your Xiaomi breakdown.
| Symptoms. | Probable cause | Method of decision |
|---|---|---|
| Interlocutor hears an echo | Failure of the second (top) microphone | Checking the hole, resetting network settings |
| Silent sound when recording video | Contamination of the main microphone | Cleaning the hole, checking the case |
| Total absence of a record | Failure of the charging plume or software | Engineering test, plume replacement |
| Crackling and noise | Moisture ingestion or oxidation | Cleaning contacts, drying, replacing the module |
Symptom analysis saves time, and if you see your case in the chart, follow the recommended method, and don't go straight to the complicated repairs if the cleaning solves the problem.
Why does the microphone wheez in the cold?
Cleaning and maintenance of the device
Regular maintenance is key to a long-lasting audio system, with dust, skin fat and pocket pile clogging tightly with the safety nets over time, and Redmi 5 is characterized by a buildup of dirt in the lower end due to the dynamic grid design.
To clean, use a soft toothbrush or a special brush for the technique. You can slightly moisten the brush with isopropyl alcohol, but it is important that the liquid does not get inside the body. The movements should be sweeping, from the center of the hole to the edges.
Using compressed air (canisters) is permissible, but with caution. A jet that is too powerful can damage the microphone membrane or drive dust even deeper if you don't close the adjacent holes. Blow in short, intermittent pulses.
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Regular preventive cleaning of microphone holes every 2-3 months prevents 80% of problems with quiet sound and recording.
If cleaning the outside doesn't help, it's possible that the contamination has made it to the inner mesh, which requires careful disassembly. Redmi 5 requires bending the plastic frame or removing the back cover (depending on the body modification) to access the insides.
Microphone replacement and repair
If software and cleaning methods didn’t work, there’s still a replacement option. As mentioned, in the Xiaomi Redmi 5, the main microphone is often part of the sub-board flex cable, which means you’ll have to change the entire plume with the charging connector.
The replacement process requires fine electronics skills, you need to turn off the battery, unscrew the screws of the lower part of the case, remove the board and disconnect the plumes. The new plume should be compatible with your board revision, since Xiaomi could make changes to the design.
⚠️ Note: When replacing the plume, be sure to check the connector condition on the main board. Oxidized contacts can cause the inoperability of even a new microphone.
Once you have installed the new module, make sure to test the engineering menu, make sure the signal level is normal and there is no extraneous noise, and high-quality sealing or installing the connector is the key to stable communication in the future.
Can you replace a microphone without a plume?
The impact of accessories on sound quality
Protective cases, especially thick or unoriginal ones, can cover microphone holes. Redmi 5 owners often use silicone bumpers, which over time deform and crawl onto technical holes.
Take off the cover and check the sound without it. If the problem is gone, it's the accessory, cut out the extra parts or find a better case, and the protective films on the screen sometimes cover the top microphone if they are pasted with displacement.
Headsets also affect the way microphones work, so when you connect the headphones to the microphone, the system automatically switches to them, if the headset is faulty, it may seem like the phone is broken, and always check if the headset mode in the status bar is active.
The quality of the recording depends on how you hold the phone. When you close the bottom end of the palm, you physically block the input of sound. The habit of holding a smartphone with a "full grip" often causes complaints about a quiet voice in messengers.