The same thing happened to my 17” MacBook Pro. I was told I needed to replace the unit - don’t remember the name of it. I had a thick black vertical line about 1/3 of the way from the right of the screen. Now, between the edge of the screen to the thick black line are super thin lines of black and other color lines. If I leave it open the color lines disappear. If I put pressure on the right corner of the screen the lines move around. I really, really hope that this works.