How to fix Xiaomi Mi Band 3: a detailed repair guide

Xiaomi Mi Band 3

The difficulty of repair depends on the type of fault. Some faults, such as contamination of charging contacts, are eliminated in 5 minutes. Others, such as replacing the display, require accuracy and minimal skills with small electronics. In this article, we will analyze the most common faults of the Mi Band 3 and give step-by-step instructions for their elimination.

Before starting repairs, it is important to understand that if the bracelet is physically damaged (cracked body, dents, traces of oxidation after water enters), it is better to consult specialists.

Diagnosis of malfunctions: how to determine the problem

The first step is to identify the symptoms. Xiaomi Mi Band 3 can behave differently depending on the type of breakdown.

• 🔋 Not charged – contact contamination, cable damage, battery failure.
• 🖥️ Screen not turned on – discharged battery, disconnected display plume, software failure.
• 📱 Not synchronized with the smartphone – problems with Bluetooth, outdated firmware, failure in the Mi Fit application.
• 💧 Reacts to water - violation of tightness, oxidation of internal components.
• 🔄 Spontaneous reboots - firmware damage, unstable power supply.

For accurate diagnosis, follow the following steps:

1. Try charging the bracelet with another cable and from another power source (USB-port).
2. Check whether the device responds to charging: when connected to the power should light up the indicator (red or green LED).
3. If the screen is not turned on, try resetting to factory settings (press the touch button for 10-15 seconds).
4. Install the latest version of the Mi Fit application on your smartphone and update the bracelet firmware.

If after these manipulations the problem remains, go to the corresponding section of the article.

No charge: cleaning contacts and replacing cable

One of the most common problems is that the bracelet doesn't respond to charging, 80% of the time it's contaminated contacts or damaged cable, and on the Mi Band 3, the contacts are located on the back of the body and are often clogged with sweat, dust or cream residue.

For cleaning, you will need:

• 🧼 Cotton swab or soft toothbrush.
• 💧 Alcohol (isopropyl or medical) or wet wipes for machinery.
• 🔍 Lupa (optional) for a better view).

Step-by-step:

1. Disconnect the strap from the body of the bracelet, pulling it towards the screen.
2. Wet the cotton swab in alcohol and gently wipe the contacts on the case. Do not press too hard to avoid damaging the coating.
3. Do the same with the contacts on the charger.
4. Let the parts dry for 5-10 minutes.
5. Connect the bracelet to charging and check if the charging indicator (red LED) has appeared.

If the cleaning didn't work, the problem could be the cable. USB-Use a port or a working cable from Mi Band 4/5 (Also check if the charger plug is bent, which is a common cause of poor contact.

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If you don't have alcohol on hand, you can use a pencil eraser, and you can gently rub your contacts to remove oxidation.

Screen not turned on: reset, firmware, replacement of the plume

If the bracelet vibrates at notifications, but the screen remains black, the problem is most likely in the display plume or firmware. If the device is completely unviable (no vibration, no charging indicator), it is the fault of the dead battery or damaged board.

Try a hard reset first:

1. Connect the bracelet to the charger.
2. Press the touch button under the screen for 20-30 seconds.
3. If the screen blinks or the Mi logo appears, the reset was successful.

If the reset didn't help, check the firmware:

• 📱 Install the latest version of Mi Fit on your smartphone.
• 🔄 In the app, go to Profile → Mi Band 3 → Firmware update.
• 📲 If an update is available, install it.

If the screen is still down, but the bracelet is charging and vibrating, the problem is the disconnected plume of the display, which is a typical malfunction after falls or heavy presses on the screen, and repairing it will require disassembling the body and plugging the plume back in.

Not synchronized with a smartphone: Bluetooth and Mi Fit settings

If the bracelet is charging, the screen is working, but the Mi Band 3 is not connecting to the phone, the problem is usually in the Bluetooth settings or the Mi Fit app.

• 📲 Mi Fit Version: Update the app to Google Play or App Store.
• 🔄 Reboot devices: turn off and turn on Bluetooth on your smartphone, reboot the bracelet (press the button for 10 seconds).
• 📱 App permissions: In your phone settings, check that Mi Fit has access to Bluetooth, Notifications, and Geodata.
• 🔗 Reset connection: in Mi Fit, remove the bracelet from the list of devices and connect it again.

If the problem is not solved, try the following steps:

1. Turn off the power saving mode on the phone - it can block the background work of Mi Fit.
2. Check if the bracelet is connected to another device (like a tablet), and the Mi Band 3 can only sync with one device.
3. Remove the Mi Fit app cache in your phone settings (Settings) → Annexes → Mi Fit → Memory. → Clear the cache).

On Android, you can also help reset Bluetooth settings:

Settings → System → Resetting → Resetting Bluetooth settings →

If nothing works, try connecting the bracelet to another smartphone. If it works, there's a problem with your phone (possibly incompatible with the version). Android/iOS or hardware constraints).

Next articleWhat to do if Mi Band 3 gets wet

Despite the stated standard of protection IP68, Mi Band 3 is not designed to swim or stay underwater for long periods of time. If the bracelet is wet, such as in the shower or pool, act quickly:

⚠️ Warning: Don't dry the bracelet with a hair dryer, battery or other heat source! this can damage the battery and display.

Instructions for saving the device:

1. Remove the bracelet from the water immediately and disconnect the strap.
2. Wash the body with a dry towel or towel.
3. Put the device in a container with silica gel (packages of shoeboxes) or uncooked rice for 24-48 hours.
4. Do not turn on the bracelet until it is completely dry!

After drying, check the efficiency:

• 🔋 Connect to charging – if the indicator lights up, most likely everything is fine.
• 🖥️ Check the sensor and screen for reaction.
• 📱 Synchronize with your phone.

If the bracelet is not turned on or malfunctioning (spontaneous reboots, artifacts on the screen), most likely, the contacts have oxidized, in which case you will need to disassemble and clean with alcohol.

Replacement of the battery: when and how to do it

The average battery life of the Mi Band 3 is 2-3 years, if the bracelet discharges in a few hours or does not hold a charge even after full charging, it is time to change the battery.

• 🔋 Charge drops from 100% to 0% in 1-2 days without use.
• 🔄 The bracelet is turned off at 20-30% charge.
• 🌡️ The body swelled or became hot during charging.

To replace the battery, you will need:

• 🔧 Plastic blade or mediator.
• 🔨 Thin screwdriver (to disconnect the plumes).
• 🔋 New battery for Mi Band 3 (can be ordered on AliExpress or in service centers).
• 🧲 Tweezers and heat glue (for battery fixation).

Step-by-step:

1. Carefully disassemble the body, putting a plastic blade on the latches.
2. Disconnect the battery plume from the board (it is usually glued, so act carefully).
3. Remove the old battery and clean the installation site of glue residues.
4. Install a new battery, connect the plume and fix with heat glue.
5. Collect the body, making sure all latches are fixed.

⚠️ Warning: Don't use superglue or other aggressive adhesives - they can damage the board.Thermoclay is safe and easily removed on next repair.

If the bracelet doesn't turn on after the battery is replaced, check the polarity of the plume connection "+" and the "-" can disable the charge.

Where to buy spare parts and when to contact the service

If you are unsure of your skills or have a serious problem (for example, a fee is damaged), you should contact a service center, but many parts for the Mi Band 3 can be bought yourself:

Contact the service is in the following cases:

• 💥 The bracelet fell from a height and stopped working.
• 🔥 On the board, traces of burning or melting are visible.
• 💧 After the water hit, more than 48 hours passed, but the device does not turn on.
• 🔧 You've disassembled the body, but you can't reassemble it.

Cost of repairs in service centers:

• Display replacement: 1,500–2,500 ₽.
• Battery replacement: 800–1,500 ₽.
• Cleaning after water ingestion: 1,000–2,000 ₽.
• Diagnosis: 300-500 ₽.

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If the bracelet is warranty (up to 1 year from the date of purchase), do not disassemble it yourself - this will void the warranty.

FAQ: Answers to Frequent Questions