Why Xiaomi’s One Headphone Doesn’t Connect to Your Phone: 7 Reasons and Ways to Fix It

You pulled out of the case favorite Xiaomi Redmi Airdots or Xiaomi Buds 4 Pro, but one headphone stubbornly refuses to connect to the phone? the situation is familiar to many owners of wireless headsets — according to statistics service centers, 37% of calls on Xiaomi headphones are associated with a problem of one-way connection, the reasons can lie in software failures and hardware malfunctions.

In this article, we’ll look at all the possible reasons why a single headphone stops syncing with a smartphone, from a trivial battery discharge to damage to a Bluetooth module. You’ll get step-by-step instructions for diagnosis and repair, and when you solve the problem yourself and when you need to contact the service. Special emphasis is on the Xiaomi model, but most recommendations will be suitable for other brands.

1. Battery discharge or charging problems

The most obvious but often overlooked reason is a dead battery in one of the headphones. Even if the indicator on the case is green, this does not guarantee that both headphones are charged the same. In the Redmi Airdots 2 and Buds 3 Pro models, it is often the problem when one earphone “hangs” at a charge level of 1-5% and stops responding to the connection.

How to check:

• 🔋 Place both headphones in the case on 10-15 If one of them doesn't flash white/red, it's discharged.
• 🔌 Connect the case to the charger and watch the indicator: if it flashes unevenly (for example, 2 short ones) + 1 long), this is a signal about a contact problem.
• 📱 In the Bluetooth menu on the phone (Settings) → Bluetooth → Sign gear next to the headphones) look at the level of charge of each headphone separately.

Critical feature of Xiaomi models 2020-2023 Years: in headphones with support for fast charging (for example, Buds) 4 Pro) at a lower depth 3% The controller's protection can be triggered, blocking charging through a standard cable, in which case you need to use the original power adapter on the mains. 5V/1And.

2. failure of synchronization between headphones

Xiaomi’s wireless headphones are master-slave: one headphone (usually the right one) connects to the phone, and the second one syncs with the first one. If communication between them is broken, the phone only sees one headphone, a problem that is especially relevant for the Redmi Airdots S and Mi True Wireless Earphones 2 Basic models.

Signs of synchronization failure:

• 🎧 The list of Bluetooth devices displays only one headphone (for example, Mi True Wireless Earphones). 2_R).
• 🔄 When connected, sound is heard in only one headphone, the second is silent or emits intermittent clicks.
• 🔄 Headphones are constantly reconnected (in the status "Connected / Disconnected»).

How to restore synchronization:

1. Remove the headphones from the list of conjugate devices on the phone (Settings → Bluetooth → Forget the device).
2. Place both headphones in the case, close the lid and wait 10 seconds.
3. Pull out the headphones and hold the button on the case (or touchpad on the headphones) for 15-20 seconds until the indicator starts flashing red and white.
4. Connect again via the Bluetooth menu.

Remove the device from Bluetooth on your phone |

Place the headphones in the case for 10 seconds |

Hold the reset button for 15-20 seconds |

Reconnect to the linking mode-->

⚠️ Note: In models Xiaomi Buds 3T Pro and newer reset is performed through the Mi Earphones mobile application (Settings section) → Reset to factory.Pattempt reset via button on case can lead to Failed to reset error.

3. Software glitches in headphone firmware

Xiaomi’s branded headphone software often contains bugs, especially after automatic updates. For example, a bug was found in the V1.7.0.8 firmware for Redmi Buds 4 Active, which caused the left earphone to lose communication at a volume level above 80%.

How to check the firmware version:

1. Put the headphones on the phone.
2. Open the Mi Earphones app (download to Google Play or App Store).
3. Go to Settings → About the program. The firmware version is listed in X.X.X.X format.

Solutions:

4. Physical damage or contamination of contacts

If the headphones fell, were in contact with water or lay for a long time without use, the problem can be mechanical damage.

• 🔌 Charging contacts in a case or on headphones (oxidation, pollution).
• 🎛️ Bluetooth antenna inside the headphone (break after falling).
• 🔊 Dynamics (infection of moisture or dust).

Diagnosis:

1. Look at the contacts on your headphones and in your case with a magnifying glass. The oxidation looks like green or white.
2. Try to clean the contacts gently with a cotton swab soaked in alcohol (do not use abrasives!).
3. Shake the earpiece near the ear – if you hear foreign sounds (such as rattling), this is a sign of damage to the speaker.

⚠️ Note: In models with active noise cancellation (Xiaomi Buds) 3T Pro, Buds 4 Pro) speaker and noise reduction microphone connected by a single plume, damage to one component can disable both!

💡

If the earphone fell into the water, don't try to turn it on! Place the device in a sealed bag with silica gel (packages of shoeboxes) on the 24-48 After drying, try to plug in. 60% This saves electronics from corrosion.

5. Conflict with other Bluetooth devices

Xiaomi smartphones (especially on MIUI 13/14) have a feature: they limit the number of Bluetooth devices simultaneously connected to 5-7. If this limit is exceeded, the system can “discard” headphones with a weaker signal.

• 🚗 Automatic radios (especially with Android Auto).
• 💻 Laptops or tablets (if they are also connected to your phone via Bluetooth).
• ⌚ Smart watches or fitness bracelets (Mi Band) 7/8, Amazfit).

How do you decide?

1. Open Settings → Bluetooth and remove all unnecessary devices.
2. Turn off the dual connection (if any) function in the headphone settings.
3. Enable Priority for Headphones in Settings → Special Options → Sound settings.

💡

Xiaomi smartphones with MIUI 14+ have a hidden Bluetooth priority feature that allows you to pin your headphones in the connection list. To activate it, type in the Phone application code ##6484## and select your headphone model.

6. Bluetooth issues on Xiaomi phone

Sometimes the problem is not with the headphones, but with the Bluetooth module of the smartphone, which is typical for the Redmi Note 10/11, POCO X3/X4 models, which uses a Qualcomm QCC3046 chip with known synchronization bugs.

• 📵 The headphones are plugged in, but the sound is interrupted every time. 5-10 seconds.
• 🔄 In the status of Bluetooth constantly rotating indicator connection.
• 🔊 The sound is only in one headphone, even if both are connected.

Diagnostic and solution methods:

If the problem persists, try updating the phone’s firmware to the latest version or rolling back to a stable build. for example, MIUI 14.0.4 for Xiaomi 12T has been patched with a Bluetooth communication cliff bug when NFC is activated.

7. When to contact the service center

If all of the above methods did not help, most likely, the problem is hardware.

• 🔧 The headphone does not charge despite clean contacts and a working case.
• 🔊 The speaker emits wheezing or does not reproduce sound at all (while the headphone is connected).
• 📡 Bluetooth earphone module is not detected by other devices (check on second phone!).
• 💧 The headphone has been in water or other liquid (even if after drying it “comes alive” after drying»).

The cost of repairs in official service centers Xiaomi:

⚠️ Warning: Unofficial services often offer cheap repairs but use non-original parts. For example, in Redmi Buds 4 Pro, fake speakers may not support the function. LDHC (High-resolution codecs, which will make the sound worse than before the repair.

FAQ: Frequent questions