I finally got ahold of a DMG GameBoy (the monochrome one), and it needed some fixing. So I opened it up and cleaned out years' worth of battery acid, turned it on, and saw an obnoxious blank vertical line in the screen. After some research on the interwebs, I took a soldering iron and rubbed along the brown data cable. That got rid of most of the lines, but there is still a 3/4 inch blank strip. When you turn the contrast all the way up, you can dimly see the stuff that should go there on normal contrast. Can anybody help me figure out how to fix it?
Here are some pictures:

And with the contrast up: