I'm actually curious when if you turn around the small plug from your adaptor directly in the connection from the Q10 Pro, you notice the display goes on and off? Doing so will give you the answer that the small power input connection is damaged. Maybe there is a way to replace the small power connection, by yourself or a qualified technician in your area.
I bought the Himedia Q10 Pro in August 2016 and it has served me well until now. It is still a pleasure to watch movies, concerts, 4k video, and streaming content as well.
Please keep us informed about your progress.