Cinema Display Shows Block of Discolored Pixels
Hi,
I have a refurbished 27" Apple LED Cinema Display that I bought from Apple in 2014. It was perfect until yesterday when it randomly showed a vertical block of pixels near the middle of the screen with some form of discoloration. I made sure the graphic card is not the suspect here by trying another display as well as using the same display on a different Mac. The problem persists, so it's something in the display.
What surprises me is the fact that these are not dead pixels; they are dynamically changing color, and can clearly be seen kind of flashing. Also, this morning I woke up my Mac to find that the display went back to behaving normally.
However, a few hours later, it started doing the same thing, with different colors. Sound is working fine.
What is the cause of the problem? And is it worth fixing?
I also attached pictures of the problem when it happened the first time.