My Atari Lynx II system developed this problem a couple of years ago. At the time, I just set it aside, but I decided to look into getting it fixed today.
The screen is messed up in an odd way. The extreme left 1/3 is completely black. The extreme right 1/3 has vertical lines (mostly white). The middle third displays the games correctly. I tried taking it apart and reseating the screen's ribbon cable, but this had no effect. Any ideas what could be causing this?