Screen is turning completely off when it has to display new content

Some time ago my OnePlus 2 screen started to malfunction: https://www.youtube.com/watch?v=FKoQ_Tuc...

I have tried to reflash ROM etc., nothing seems to fix it and the heavy screen flickering (on high brightness) seems to point to a hardware issue.

I'm currently using another phone, but would like to experiment with the OnePlus 2 since I don't have anything to lose. I'm wondering could baking in the oven (aka solder reflow) in this situation help? If so, what would make more sense - “baking” the motherboard or the display?