Why does the Redmi Watch 4 have a black screen, crash or cannot be turned on? What to do if the Redmi Watch 4 screen can’t slide?

When you turn on the Holographic Display, the Redmi Watch 4 will have a black screen. If you turn on the Smart Power-on function, the watch will automatically black out when it detects that you have taken off your wrist or are sleeping to reduce the power consumption caused by the screen being on all the time. The watch will also automatically black out in sleep mode.
The following are the steps for your reference:
1. Connect the device to the charging base and charging cable and keep charging for more than 10 minutes;
2. If the device still cannot be turned on after charging, you can try to force restart. Press and hold the Power Button for more than 12 seconds to force restart;
3. If the device still cannot be turned on, you need to apply for after-sales inspection.