If the watch screen turns off, you can't light up the screen by lift-wrist or pressing the power key / shortcut key, please try the following operations:
1. The watch may be out of power, please connect the charging stand to check whether the power is sufficient.
2. Please press the power button for 12 seconds to force the watch to restart. After restart, please check the watch value version, please upgrade the watch to the latest version.
Does it help?