Why Xiaomi’s phone doesn’t have one headphone: full diagnostics and repairs

You've turned on your favorite playlist, and the sound comes from only one headphone? The wired headsets problem on Xiaomi smartphones is one of the most common malfunctions faced by users of models from Redmi Note 10 to Xiaomi 13 Ultra. In 80% of cases, it's not the phone itself that is to blame, but mechanical damage to the cable, connector or software failures. But how to accurately determine the cause and fix it without going to the service center?

In this article, we’ll look at all the possible reasons why one headphone can be silent, from the banal contamination of the 3.5 mm jack to damage to the phone’s sound card. You’ll learn how to check the headset on another device, test the audio output of a smartphone, and what to do if the problem lies in the firmware MIUI. And for owners of models without an audio jack (for example, Xiaomi 12T), we’ll separately consider the nuances of working with USB-C adapters → 3.5 mm.

1. Primary diagnosis: headphones or phone?

Before you take your phone apart or carry it for repair, cut off the simplest reasons. Start by checking the headset itself:

• 🔊 Connect your headphones to another device (PC, laptop, other smartphone). If both speakers work, the problem is with your Xiaomi phone.
• 🔄 If the silent speaker is working and the second one is gone, it's the cable or plug.
• 🎧 Try another headset on your Xiaomi. If the new headset is working properly, the old one is out of order.

If the headphones are working, but the sound comes from only one speaker, go to check the phone. On models with a 3.5 mm connector (Redmi 9A, Poco M3), inspect the socket for foreign objects (dust, pile, oxidation). For phones with USB-C (Xiaomi 11T, Redmi K50), check the adapter - often contacts in it depart after active use.

Mechanical damage: connector, cable, plug

70% of all earphones are physically damaged, and consider the most vulnerable areas:

And if you pay attention to the connection between the cable and the plug, which is where the most common break is due to constant bends. If you move the wire, the sound appears and disappears, the problem is in that place. For a temporary solution, you can fix the cable with a tape, but it is better to solder the plug or buy new headphones.

⚠️ Warning: Do not use alcohol or liquid cleaners for the 3.5 mm connector! Getting moisture on the contacts can cause corrosion. Better gently blow the socket with compressed air (for example, a canister to clean the keyboard).

3. Software failures: sound settings and MIUI

If mechanical damage is ruled out, the problem may lie in the firmware or settings. Xiaomi smartphones based on MIUI sometimes reset audio parameters after updates or due to application conflicts.

Check the sound balance in the settings|Turn off the Bluetooth headsets|Reset the sound settings|Update. MIUI last-minute|Run the audio test through the engineering menu-->

How to check the sound balance:

1. Open Settings → Sound and vibration → Sound balance.
2. Make sure the slider is in the middle. If it's left/right, move it to the center.
3. Check the sound: if the balance is knocked down, the problem is solved.

If the balance is fine, but the sound comes from only one headphone, try resetting the sound settings:

Settings → System → Resetting settings → Resetting sound settings →

This operation will not delete your data, but will return all audio parameters to factory values.

For advanced users, MIUI has a hidden engineering menu where you can test the audio output to get there:

1. Open the Phone app.
2. Enter the combination: ##36446337## (code may differ for different models).
3. Select Hardware Testing → Audio → Headset Test.
4. Follow the instructions on the screen.

If the test shows an error (for example, Headset Mic Error), the problem is hardware – most likely, the connector or sound board is damaged.

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If the sound in the headphones is gone after the MIUI update, try to roll back to the previous firmware version via Fastboot.Instructions for your model, look for the Xiaomi.eu or 4PDA forum.

4.Problems with USB-C and Bluetooth adapters

Xiaomi models without a 3.5 mm connector (Xiaomi 11/12/13 series, Redmi K40/K50) use USB-C → 3.5 mm adapters or wireless headphones.

• 🔌 adapter USB-C: Often fails due to poor contact. Try a different adapter or connect the headphones directly to the PC through the same adapter — if the sound is normal, the problem is the phone.
• 📶 Bluetooth Headset: If one headphone doesn’t work wirelessly, reset it in the manufacturer’s app (such as Mi Headphones) and reconnect it.
• ⚡ Fast Charging Mode: On some models (Xiaomi 11 Lite), the adapter may conflict with Quick Charge. → Battery and check the sound.

Another trick for USB-C adapters is to try to plug the headphones in after the phone is fully loaded. Some users note that if the headset is connected before the smartphone is turned on, one speaker may not be detected. Also check if the "Contaminated connector" notification is on, in which case MIUI artificially restricts the audio output.

⚠️ Note: Cheap non-original adapters USB-C Often does not support sound (not available). DAC). Use only certified adapters from Xiaomi or trusted brands like Anker.

5. Oxidation and corrosion: how to clean the connector

Humidity, sweat, fluids, all of these things oxidize the contacts in the 3.5mm connector, and the symptoms are that the sound comes and goes, or one earpiece is quieter than the other, and you clean the socket.

1. Turn off the phone and take out the battery (if the model is collapsible).
2. Take a toothpick with cotton wool soaked in isopropyl alcohol (90%+).
3. Carefully scrolling the toothpick inside the connector, removing the plaque.
4. Let the phone dry for 10-15 minutes before turning on.

You can use a contact cleaner for deep cleaning (like Kontakt 60), spray it into the connector, then blow it with compressed air. Don't use metal objects, they can bend the contacts!

If the oxidation is strong (green or black), the connector may require soldering, in which case it is better to contact the service. The average cost of repairing the connector on Xiaomi is from 800 to 1500 rubles (2026).

6.Sound board damage: when replacement is needed

If all the previous methods failed, the problem may be in the audio codec (sound chip) or soldered contacts, these are the most difficult cases, and without disassembling the phone, they can not be diagnosed.

• 🔇 The sound goes missing in both headphones, but the phone's speakers are working.
• 🎛️ In the engineering menu, the audio test gives an Audio error IC Error.
• 🔥 The phone overheats when playing sound through headphones.
• 🔄 The problem arose after falling or getting moisture.

On Xiaomi models, the sound chip is often integrated into the main board, and its replacement requires micro soldering (BGA-The cost of such repairs starts from 2500 rubles and depends on the model:

Before repairing, check whether your phone has a warranty. Even if it is over, Xiaomi sometimes meets the official service centers and repairs at a reduced price (especially for flagships like the Xiaomi 13 Pro).

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If the phone falls or gets wet, don’t try to repair the sound yourself! corrosion on the board can spread to other components (such as the Wi-Fi module), and the cost of repair will increase significantly.

7. Alternative solutions: if repair is not an option

If you can’t fix your phone or headphones, consider making temporary decisions:

• 🎧 Bluetooth headset: Modern models (e.g. Xiaomi Buds 4) cost from 2000 ₽ It will completely replace the wired headphones.
• 🔊 Outside DAC: USB-C audio cards (e.g. Xiaomi) USB-C Audio Adapter Pro bypasses the built-in audio chip and gives a clean sound.
• 📱 Wireless audio transmission: Apps like SoundWire allow you to use your phone as a sound source for PCs or speakers.
• 🔧 Flashing: In forums 4PDA there are custom firmware with corrected audio drivers for popular models.

For owners of Xiaomi with an infrared port (Redmi Note 8 Pro, Mi 9), there is an exotic option: buy an IR transmitter for headphones (for example, Xiaomi Mi IR Audio Transmitter), which transmits sound over an infrared channel to compatible headphones, but the quality will be worse than Bluetooth.

If you’re going to switch to wireless headphones, look for models that support aptX or LDAC — they provide minimal audio delays, which is important for games and video. In the budget segment, Redmi Buds 4 Active will suit, in the premium segment — Xiaomi FlipBuds Pro.

FAQ: Frequent questions about broken headphones on Xiaomi