MY screen had a white line going down the screen. I opened it up and unplugged the digitizer as well as other cables. Every time I closed the phone the line would come back but I noticed the line wasn't there before I completely closed the screen down in the phone. These cables are very sensitive to certain positions or certain torque on them...
I maneuvered the cables a few times and the screen would do weird things. and move around on its own. I would clean and maneuver the digitizer cables again. I'm not sure if the digitizer fixes this or just maneuvering the cables does.
I ended up loosening one of the screws on the metal plate that covers the cables and the white line was finally gone. I guess the cales had to much force on them. If your going to open your own phone you may want to tinker with the cables and the screws to see if it helps until you get them in a position that wrks best.
My phone works now but periodically will not swipe I wait a few seconds and it will work correctly .I may have to go back in a tighten or loosen something....