Why Xiaomi Wired Headphones Don’t Connect to Redmi Phone: Full Diagnostics and Repairs

Why the headphones stopped working on Redmi

You put wired headphones in Xiaomi Redmi, but the sound keeps going through the speakers and the phone doesn't respond to the connection? This problem is more common than you think — and it's not always the fault of the connector itself. The fact is that Redmi smartphones (especially the Note 10/11/12, Redmi 9/10 and POCO models) have features in analog audio processing related to energy optimization and moisture protection.

In 60% of cases, the malfunction is due to a contaminated 3.5 mm connector or damaged headphone cable, but sometimes software failures are to blame, such as a conflict with MIUI 13/14 firmware or incorrect audio settings. In this article, we will analyze all possible causes, including hidden developer parameters that Xiaomi does not advertise, and give clear diagnostic instructions.

Before you carry your phone to the service, go through our checklist - in 8 out of 10 cases, the problem can be solved on your own in 10 minutes.

1. Check of the connector 3.5 mm: mechanical damage and contamination

To start with, the obvious physical condition of the connector, Redmi often suffers from dust, moisture, or mechanical damage (e.g., if the headphones were pulled at an angle).

🔍 Visual inspection: illuminate the jack with a flashlight - there should be no debris, oxidation or bent contacts inside. Pay special attention to the four gold strips (left/right channel, earth, microphone).
🧲 Magnet test: hold a small magnet to the connector. If you hear a slight click, there is a metal shaving inside (a common problem after repair).
📱 Checking on another device: insert the headphones into another phone/PC. If they work, the problem is the Redmi connector.

If you find contamination, do not use alcohol or wet wipes - this can damage the contacts.

🪥 Toothpick with cotton wool: scroll gently inside the connector to remove dust.
💨 With compressed air can: blow out the garbage with short presses (hold the balloon vertically!).

💡

If the connector doesn't work after cleaning anyway, try moving the headphone plug slightly left-right when you connect, and sometimes the contacts will sink due to the deformation of the body.

⚠️ Warning: If you connect your headphones to your phone, you can say "Accessories not supported," and that means you can't short-circuit the headphones until you're repaired, you can burn the audio chip!

2. Diagnostics of the cable and headphone plug

Even Xiaomi’s original headphones (such as the Mi Basic or Redmi Buds 3 Lite in the wired version) often fail due to the cable rubbing at the plug or the break of the internal veins.

🔊 Bending test: turn on the music and bend the cable gently at the base of the plug. If the sound is interrupted, there is a cliff.
🔄 Microphone check: call another phone and talk. If the person can't hear you, but the music is playing, the microphone's vein is damaged.
🔌 Inspection of the plug: TRRS-connector (4 contacts) should not be black oxidation bands or bent contacts.

If the headphones are not original, pay attention to their impedance (resistance). Redmi does not work well with headphones above 32 ohms - the sound will be quiet or absent. Check the characteristics on the body or in the instructions.

How to check the impedance of headphones without a multimeter?

If you connect the headphones to a PC and in the "playback devices" (control panel → Sound) select them, and then run the test signal (for example, through AudioTester), then with impedance above 50 Ohms, the sound will be noticeably quieter than through the phone's speakers.

Symptoms.	Probable cause	Decision
There's only sound in one ear.	Left/right channel vein break	Replacement of cable or soldering
Noise/cracking when the plug moves	Oxidation of contacts or poor contact in the connector	Clean the connector, replace the headphones
The phone can’t see the headphones, but charging through them goes	Short circuit in the plug (usually between the ground and the microphone)	Do not use! Repair or replacement
It's sounding, but it's very quiet.	High impedance headphones or failure in the settings MIUI	Impedance check, resetting sound settings

3. Software failures: sound settings and MIUI conflicts

If the hardware is okay, the problem is the software part, and MIUI is known for bugs with audio drivers, especially after updates.

Phone reboot: trivial, but helps 30% of the time. Keep Power + Volume up 10 seconds for a forced reboot.
Reset audio settings: Go to Settings → Sound and vibration → Additional → Reset audio settings. Confirm reset and restart the phone.

Bluetooth Disconnection:

Bluetooth

Checking the developer mode:

How to turn on the developer mode on Redmi?

Go to Settings → About Phone → MIUI Version and tap it 7 times. After that, Settings → Additional option “For Developers” will appear.

Turn on USB debugging (sometimes affecting audio drivers).
Find the item Turn off the absolute volume and turn it off (if it is on).
Check to force the use of audio via USB - should be turned off.

If the headphones still don’t work after these manipulations, try resetting the network settings (does not delete files, but resets Bluetooth/Wi-Fi):

→ SIM-maps and mobile networks → Network reset

Yes, the update was recent.|Yeah, but long ago.|No, it's not updated.|I remember.-->

4.Firmware conflict: MIUI 13/14 bugs and system rollback

Users of Redmi Note 10 Pro, Redmi 9T and other models often find that after upgrading to MIUI 13.0.4+ or MIUI 14, the audio output stops working.

🐛 Bug in the driver qcom_audio: It affects phones with Snapdragon processors 6xx/7xx.
🔒 Blocking uncertified accessories: Xiaomi added a plug resistance check.
📱 Conflict with the HyperOS shell: in new versions, the algorithm for recognizing connected devices has been changed.

Decisions:

Firmware rollback: If the problem has occurred after the update, return to the previous version via Fastboot.Instructions: Download the archive with the desired version MIUI official website|Install ADB and Fastboot|Put your phone in Fastboot mode (Power) + Loudness down)|Run the command fastboot flashall-->
Install custom core: for example, Pixel Experience or LineageOS (requires unlocking the bootloader).
Magisk module: Audio Compatibility Patch solves the problem with uncertified headphones.

⚠️ Warning: Rolling back the firmware or unlocking the bootloader will reset all data and may deprive you of warranties. On Redmi Note 11 and later, after unlocking, the encryption of data is blocked, the phone will become less secure!

5. Hardware malfunctions: audio chip and motherboard

If none of the previous methods helped, the problem may be in the hardware:

🔧 Audio chip damage: often occurs after a phone falls or moisture hits.Redmi uses Qualcomm chip WCD93xx or Realtek ALC56xx.
🔌 The dump of connector contacts: when soldering, the tracks on the motherboard could depart.
💧 Corrosion after moisture: Even if the phone didn't sink, condensation could oxidize the contacts.

Diagnosis in the service will cost 300-800 ₽, repairs from 1,500 ₽ (plug replacement) up to 5,000 ₽ (audio chip replacement before commuting to the service:

📸 Take a picture of the magnification connector (can be done through a magnifying glass).
🎧 Try connecting other headphones (preferably original Xiaomi).
🔊 Check if the external speaker is working – if not, the problem is precisely the audio chip.

💡

The Redmi Note 8/9 most often fails the connector, and the Redmi 10/11 — audio chip, due to a change in the power scheme in new versions of the boards.

6. Alternative ways to connect headphones

If repairs are delayed, and headphones are needed urgently, use the workarounds:

🔌 USB-C → 3.5 mm adapter: official adapter Xiaomi is worth ~500 ₽, But it doesn't work with all models. Check compatibility on Mi.com before you buy.
📶 Bluetooth headphones: even the cheapest Redmi Buds 3 (~1 500 ₽) They will be more reliable in case of hardware failure.
💻 Connection via PC: if you need to listen to music urgently, connect your phone to your computer USB and use it as a sound card (in Windows Sound Settings, select Redmi as the output device).

For the USB-C adapter → 3.5 mm, it is important to:

Use an original or certified adapter (cheap Chinese is often not recognized).
In Settings → Additional → For developers to enable Force the use of audio via USB.
If the sound is late, turn off Bluetooth and Wi-Fi Direct.

7.When to contact the service: checklist before the visit

If you have exhausted all options, but the headphones still do not work, prepare for a visit to the service center:

Original Xiaomi headphones (if any)|Check or box from the phone (for guarantee)|Screenshot of phone information (Settings) → The phone)|List of actions you have performed (cleaning, resetting, etc.)-->

The cost of repair depends on the model:

Model Redmi	Replacement of the 3.5 mm connector	Replacement of audio chip	Diagnostics
Redmi 9/9A/9C	1 200–1 800 ₽	3 500–4 500 ₽	300–500 ₽
Redmi Note 10/10 Pro	1 500–2 000 ₽	4 000–5 500 ₽	400–600 ₽
Redmi 11/12	1 800–2 500 ₽	5 000–7 000 ₽	500–800 ₽

Please note:

🛠️ In informal services, repairs are cheaper, but the risk of losing the warranty (if it is still valid).
📅 Redmi with a valid warranty (up to 18 months) will replace the connector for free, if the failure is not the fault of the user.
⚡ If the phone does not turn on after connecting the headphones, most likely, there was a short circuit - urgently in the service!

FAQ: Frequent questions about connecting headphones to Redmi

Why does my phone say "Accessories are not supported" when I put my headphones in?

This error occurs in two cases: Your headphones have non-standard resistance (for example, professional studio models with an impedance of 250 Ohms); In the connector, short circuit (often after moisture hits); Solution: try other headphones. If the error persists, bring the phone to the service.

The headphones are working, but the sound is also going through the speakers. How do you turn it off?

This is a MIUI 12-14 bug where the phone doesn't recognize the connection fully. Helps: Reboot the phone; turn on/off In your pocket mode (Settings → Screen → In your pocket); reset the audio settings (see section 3).

Can I repair the 3.5mm connector myself?

If the problem is pollution - yes (see section 1). If the tip of the contacts or damage to the chip - no. To solder the connector you need: soldering station with a temperature of 300-350 ° C. Flus RMA-223 and solder Sn63Pb37. Microscope or magnifier with a magnification of ×10-×20. Without experience, you risk damaging the motherboard.

After the MIUI update, the sound in the headphones disappeared.

First try: Reverse the update (if it was recent); Set up Custom Recovery (TWRP) and flash the Audio Fix module. Reset your phone to factory settings (pre-backup!). If nothing helps, write in support of Xiaomi via Settings → Feedback – sometimes they release patches for such bugs.

The headphones are working, but the microphone is not. What's the matter?

This is a typical problem of 4-pin plugs (TRRS), Check: Is the microphone working on another device, is there any damage to the cable near the plug, is it enabled in the settings of the call "Use headphones as a microphone" (Settings) → Sound. → Additionally).