My Manga Screen 2 PCB gets very hot when backlight is set to 100%.

My Manga Screen 2 PCB gets very hot when backlight is set to 100%. Is this normal and ok to use, or is there anything to do like active cooling for using 100% backlight?

The back of the pcb has been measured at 66 deg C with normal use, which I think is fine. There are no electrolytic caps that can dry out.