T machine display

What would cause a display screen on a T machine to "glitch" (not sure if that would be a exact description". When you look at the screen for a few seconds it will blink or glitch. It's not very noticeable unless your staring at it for a few seconds. It's very strange. The machine is a 3t0s with 30,000 hours. I am at the point of having to replace several displays through out my machines. So I was curious if it may be time to replace this display.

Thanks for any info..