I have Galaxy Tab Pro S (windows 10) SM-W703NZKABTU which needed warranty repair early in its life, but has been perfect since.
Issue : screen will not turn back on once tablet turns screen off in power save mode.
I have tried keeping my finger on the power button, but have noted some flickering on screen when I do. I then plugged in a USB hub and HDMI card and found that the machine is working, but the built in screen is not. Once I plug the screen in the tablet display usually comes back to life. Occasionally I can get it it working by keeping the power button pressed, but is hit and miss. Once the display os working there are no issues at all, no lines or distortion. This only started about a month ago.