Lines across bottom 2/3 of screen

The bottom 2/3 of my screen has lines running across it - one band of horizontal lines and one band of vertical lines. Almost exactly the same as the lines in this image (http://www.appledefects.com/wiki/index.php?title=Image:BandScreen.JPG), except mine has a second band of lines.
I know this problem has been dealt with before, but I haven't found a solid answer (see this discussion: http://discussions.apple.com/thread.jspa?messageID=6698227).
When I twist the screen HARD I can get some of the lines to go away, but they reappear as soon as a stop twisting. I've tried to repair the problems myself by taking apart the display and adding some additional padding in an effort to improve the LVDS cable connection. This hasn't improved the problem at all. I've found information suggesting that the problem is either the logic board, the LCD display itself, or the LVDS cable.
Does anyone know how to tell which part is the source of the problem? I can't afford to have someone else do the repair, but I'm really desperate to have a working computer again.
Thanks so much for any insights you can offer!

See Article: http://support.apple.com/kb/TS2377 MacBook Pro: Distorted video or no video issues
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