Hi, If the watch screen appears to flicker, or there are horizontal lines running across it, inspect the watch screen for physical damage. If the watch is not damaged, try restarting it. However, it may be necessary to check for software updates and uninstall apps, including watch faces from the watch.
If the screen is still black, we suggest you get the watch examined by the technician to fix it. I suggest you reach out to Text We Care (932 273) or live chat support by using the link below and they will help you with the service ticket.
www.samsung.com/ca/livechat. We are available 24/7
Do u think software could be an issue ?