The situation when a favorite fitness tracker suddenly stops responding to touch is familiar to many owners of smart gadgets. The black screen and the lack of vibration when connecting to the charger cause panic, but in most cases the problem is solvable at home. Complete discharge or software failure are the most common causes of this behavior of the device, and they rarely mean physical failure.
Before you carry the gadget to the service center, you should try to carry out a number of diagnostic procedures. Xiaomi Mi Band is a reliable device, but its electronics are sensitive to power surges and software errors. If the bracelet was discharged for several months, it can take up to 30 minutes to “rock” the battery before turning on the screen.
In this article, we will discuss in detail the algorithms of actions for different models of trackers, you will learn how to distinguish a software glitch from a hardware malfunction and what steps to take to restore operability.
Primary diagnosis and charging features
The most common, but common, cause of failure is oxidation of the contacts or contamination of the contacts, and there are metal pens on the back of the tracker that, when they come into contact with the magnetic cable, transmit current, and if they get moisture, sweat or dust, the circuit does not close, and no charging goes.
Wash the back of the device and cable contacts with dry soft cloth.Do not use alcohol or aggressive chemicals as this can damage the coating. After cleaning, press the tracker tightly to charge, making sure that the magnets hold it in the correct position.
Often users use powerful adapters from smartphones, which can be harmful to the small battery of the tracker.It is recommended to use USB ports of the computer or old charging units with currents up to 1 Amp.
☑️ Checking charging
If the screen is still black, try to move the tracker slightly in different directions on the cable, sometimes microscopic displacement is enough to restore contact, and it is worth checking the cable itself for clamps or damage to the insulation.
Software reset and system reboot
Sometimes the operating system of the fitness bracelet hangs in a cyclical process or goes into a deep sleep, from which it can not come out on its own, in this case, a forced reboot is required. For different models of the Xiaomi Mi Band, the procedure may differ, but the principle is the same: you need to simulate battery discharge to zero or use special commands.
On touchscreen models (starting with version 4), leaving the device on charge for a long time sometimes causes the controller to reset the error, but a more effective method is to use third-party applications such as Notify for Mi Band or Tools & Mi Bandage.
These utilities allow you to send a system signal to restart even if the main interface is not responding. In the application menu, you need to find the "Actions" or "Debugging Mode" section and select "Reboot" or "Restart".
How does a software reset work?
It's important to understand that a software reset doesn't delete your data, it only updates the state of RAM, and if the problem persists after the reboot, it may be a conflict of firmware versions.
Synchronization and update of firmware
Unstable work often involves desynchronizing data between the wristband and smartphone. If Mi Fitness (formerly Zepp Life) doesn't see the device or shows a connection error, it can block the normal operation of the tracker, you need to completely break the connection and create it again.
Go to your Bluetooth settings on your smartphone, find your tracker in your device list, and click "Forget device" or "Untie." Then remove the tracker app from your list of running tasks and run it again. Try searching again.
If the device is found but not working, check for updates. The current firmware contains bug fixes that may have caused the freeze, the upgrade process should take place with a battery charged at least 20% and a stable Internet connection.
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Before updating the firmware, be sure to close all other applications on the smartphone so that the system does not interrupt the process of data transfer by background tasks.
The table below shows the main symptoms and possible solutions for different failure scenarios:
| Symptoms. | Probable cause | Decision |
|---|---|---|
| Black screen, no vibration. | Deep discharge or oxidation | Cleaning contacts, long-term charging |
| There is vibration, but the screen is not lit. | Damage to the display plume | Replacement of the screen module is required |
| Hangs on the logo when turned on | Firmware error | Flashing through the app |
| Not determined by the phone. | Bluetooth module failure | Reset network settings or Hard Reset |
Model features: Mi Band 4, 5, 6, 7, 8
Each generation of fitness trackers has its own design features that affect repair methods. For example, in the Mi Band 4 and Mi Band 5, the capsule is removed from the strap, which makes it easier to access contacts for cleaning. In newer models, such as the Mi Band 7 and Mi Band 8, the design has become more airtight, but the principles of diagnosis remain similar.
For models with NFC module problems can be associated with the attempt to use access cards, which sometimes led to software conflicts in early versions of the software. Owners of the Pro or NFC versions should try to disable the contactless module through the application, if possible.
It is worth noting that the Mi Band 6 and later uses a more capacious battery, but the power consumption of AMOLED screens is much higher. If the tracker was lying idle for a long time, the chemical processes inside the battery could lead to a voltage drop below the critical level.
Owners of older models (1-3 generations) should consider the natural wear of the lithium-polymer cell. If the device is more than 3-4 years old, the probability that the battery simply ran out of life is extremely high.
Hardware malfunctions and physical wear
When software methods are powerless, you have to look at hardware problems, and the most common is battery bloating, and if you notice that the tracker capsule has deformed, the screen is arching, or there are gaps in the case, it's dangerous to use the device.
A ballooning battery can damage the display matrix or control board, in which case you should stop charging, as this can lead to fire or damage, you need to replace the battery.
⚠️ Warning: If the tracker body is swollen or smells of burnt plastic, immediately stop charging attempts and dispose of the device at a specialized point.
Another common problem is the drift of the display plume, which often happens after falls or heavy impacts on the doorjamb, Symptoms: the tracker vibrates at notifications, the phone sees it, but the screen remains black or shows a distorted image.
Repair of the plume at home is possible only if you have the skills of soldering microscopic contacts and special equipment. For most users, it will be more rational to replace the device, since the cost of work often exceeds the price of a new gadget.
Prevention and proper operation
To ensure that Xiaomi Mi Band lasts long and does not cause problems with powering, it is important to follow the rules of operation. Do not let the device completely “zero” on a regular basis. Lithium polymer batteries are better at storing charge at 40-60%.
Avoid extreme temperatures. Heat above 40 degrees or frost below -10 can irreversibly damage the battery chemistry and screen crystals, and it is also worth protecting the device from direct hitting of a jet of water under high pressure, despite the declared moisture protection.
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Regular but not frequent charging (every 5-7 days) extends the life of the battery more effectively than the rare full charge-discharge cycles.
Periodically wipe the pulse sensors and charging contacts. The accumulation of dirt can not only interfere with charging, but also cause false readings of the sensors, which increases energy consumption and leads to more frequent discharge.