Why is the Video Screen Blinking in Galaxy S8|S8+?

This is a normal phenomenon related to a flicker of a light source that occurs when the light source taking the form of a flashing frequency of the fluorescent lamp to the camera. Flicker phenomenon can mainly be generated at a shutter speed of 1/120 or more and it occurs in the characteristics of the CMOS sensor. It is not a product defect.

Especially, as a frame rate of slow motion is 240 frame rate per second, you may feel flicker phenomenon more certainty. This is normal operation which can happen on all camera with CMOS sensor and it’s caused by CMOS sensor’s original specification.