Many fitness tracker owners face a situation where the device is completely discharged, has been connected to a power source, but after being removed from charging, the screen remains black.The Xiaomi Mi Band 4 is no exception, and the lack of reaction to touch can put the user into a stupor.In most cases, the gadget is not broken, but simply went into deep sleep mode to preserve residual charge or requires forced activation.
Understanding the workings of lithium polymer batteries in smart wristbands helps avoid panic: If the tracker has been discharged for a long time, it may take time to set up the minimum voltage before it can start the operating system.
In this article, we will discuss in detail all possible scenarios, from regular inclusion to hard resetting. You will learn how to distinguish a software glitch from a hardware malfunction and what actions you need to take to bring your gadget back to life. It is critical not to try to disassemble the body of the bracelet yourself, as this will lead to loss of warranty and possible damage to water protection.
Primary diagnostics of the device condition
Before you go into action, you need to assess the current state of the tracker. Often the problem is not in the device itself, but in the contacts or power source. Visually inspect the back of the Mi Band 4 capsule for oxidation or contamination. Metal contacts should be clean and dry.
Make sure you're using an original or certified charging cable.Cheap counterparts often can't pass the necessary current to "wake up" a deeply discharged battery. USB-port of the computer or a high-quality smartphone power supply and leave on 10-15 minute.
Notice the vibrating motor, and if you feel a slight vibration when you're connected to charging, it's a good sign that the power controller is working, and if the device is silent, try to wipe the contacts with soft cloth soaked in alcohol and repeat the connection procedure.
- 🔌 Check the integrity of the charging cable and the absence of clogs.
- 🧹 Clean the charging contacts on the bracelet and cable.
- ⏱ Leave the device on charge for at least 15 minutes without action.
- 📱 Make sure the power supply is 5 volts stable.
⚠️ Warning: If after 30 minutes of charging, even the logo does not appear on the screen, and there is no vibration, it is possible that the battery has gone into a deep discharge or the power controller has failed.
Don't immediately try to turn on the device with a button if the charge indicator has not yet caught fire. Let the battery accumulate sufficient potential. Sometimes the process of "rocking" the battery takes time, especially if the gadget has been lying idle for a long time.
Activation algorithm after full charge
If the battery light on the screen is on, or you see the percentage of charge, but the interface is not loading, you need to perform manual activation. The standard way to turn on the Mi Band 4 is to press the touch area for a long time, which distinguishes it from models with a physical button.
Place your finger in the center of the screen and hold it for 3-5 seconds. Don't just touch it, but apply a moderate force, simulating a push. The screen should light up and the MI logo will appear. If that doesn't happen, try interrupting the charging process and reconnecting the cable, then immediately clamping the sensor.
In some cases, a short-term connection to the Mi Fit app (now Zepp Life) helps. Open the app on your smartphone, go to the device profile and try sending a sync command. Sometimes an external signal wakes up the tracker and it comes out of sleep mode.
If the screen lights up but the image is dim or flashing, let the device work for another 10-20 minutes on charging. Low voltage may prevent the display from running at full power, creating the illusion of a malfunction.
Hard Reset (Hard Reset) procedure
When standard on-boarding methods fail and the device is stuck in a black screen, a forced reboot is required. For the Xiaomi Mi Band 4, there is a special algorithm of actions that initiates a system reboot at the controller level.
Without disconnecting the bracelet from the charger, find the touch button. You need to press and hold it for a period of time. 10-15 Unlike a normal switch, it takes a longer time to get there, and at some point you have to feel the vibration or see the logo.
If you don't work the first time, repeat the procedure, but this time try to press the sensor rhythmically, alternating with a long clamping, sometimes the system responds to a series of touches as a wake-up call.
What if Hard Reset doesn’t help?
If prolonged sensor retention fails, there may be a firmware failure. In this case, only flashing through an engineering menu or specialized software will help, which requires disassembling the device.“ It is important to understand the difference between software freeze and physical failure. If after a hard reset, the device vibrates, but the screen remains black, the problem may be in the display plume. If there is no reaction, most likely a problem in the board or battery. After successfully turning on the tracker, you need to make sure that it interacts correctly with the phone. Often after a hard reset, the device is re-locked, the device can be re-uploaded to the list of the Bluetooth. In some cases, you need to remove the device from the list and add it again as new. Make sure that the smartphone settings for the Mi Fit or Zepp Life app allow all necessary rights, especially access to geolocation and background work. Without these permissions, stable communication with the tracker is impossible. Parameter Normal value Problem value Action Battery Charge More 20% Less. 5% Put on charging the firmware version Update in the application Bluetooth Status Connected Search... Reconnect the Interface Language Russian/English Cracosabre Change in Settings Firmware Update for stable operation One of the common causes of unstable turn on is outdated software. Developers regularly release updates that correct energy management errors. If you have a Mi Band 4 It's turned on, but it's slow, check for updates. In the Zepp Life app, go to the tracker profile and click "Update Version." It takes a few minutes, during which time the bracelet should be near the phone. Don't interrupt the process and don't move far away from the smartphone. Once the device is updated, it automatically restarts. This is a normal procedure that takes about a week to complete. 30-60 At this time, the screen may go out and light up again. 💡Before updating the firmware, make sure that the charge of the bracelet is at least 50%, If the update is interrupted and the bracelet has stopped responding, don't panic. Leave it on charge for a few hours. In most cases, the recovery system will fix the file system errors the next time it turns on. Typical problems and solutions Even after successful activation, users may experience residual effects, such as the bracelet may quickly discharge or miscalculate steps, often because the sensors' calibration is lost when the sensors are deeply discharged. Try calibrating the accelerator. Go a known distance (e.g., 100 meters) and compare it to another device. If the error is high, you may need to reset completely to factory settings through the bracelet menu. Once turned on, the brightness could be set to a minimum or, conversely, to a maximum, which affects autonomy. → Settings → Brightness and choose the optimal level. 🔋 Fast discharge: check background apps and notifications. 📉 Wrong pulse: tighten the strap for better contact. ❄️ Screen freezing: Avoid sudden temperature changes. 🔄 Synchronization errors: Remove and add the device again. ⚠️ Warning: If the bracelet heats up while charging or operating, disconnect it immediately from the mains, which may indicate a short circuit inside the battery. Regularly restarting the device (once a week) helps clear the system cache and prevents the accumulation of errors that can lead to a freeze in the future. To prevent the situation with the inability to turn on again, it is important to follow the rules of operation of lithium batteries. 4 If you plan to not use the tracker for a long time, charge it to the point of contact. 60-70%. Turn on the device once a month and let it work for a few minutes, even if you don't wear it all the time, it keeps the chemistry in the battery active and prevents cell degradation. Avoid extreme temperatures. Storing the bracelet in the cold or in direct sunlight can irreversibly damage the battery, after which it will stop holding charge or turn on. 4 It's usually due to a deep battery discharge that takes time to "spin" or a software failure that's solved by a hard reboot. It's also possible to have problems with the charger contacts. How long do you have to keep the bracelet on charge? For primary activation after a long downtime is enough 15-30 It takes about a minute to fully charge. 1.5-2 hours. Don't keep the device on charge for longer than 3-4 hours unnecessarily. Can the battery be replaced in the Mi Band 4? Technically, replacement is possible, but requires disassembling the capsule, which disrupts the water protection and often results in damage to the body. It's easier and cheaper to purchase a new capsule or bracelet whole. What does a flashing logo mean when turned on? A flashing logo usually indicates the upgrade process, low battery charge or the system's attempt to recover from a failure. If the blink lasts more than 10 minutes, a reboot is required.