All the help is much appreciated, now I'll know what to do when I get my next "as is" gameboy as they are currently the only DMGs in my budget range.

Perhaps someone know where I could procure only the top pcb without buying a unit.

Well I've attempted to solder and apply pressure to recolor some of the columns but only one came back, one started going out, and the other three (none at the edges) would not discolor even for a moment.

Have there been other cases of unfixable columns or other places to try applying the fix to? I've nearly (read: partially) melted the damn brown ribbon off in some spots.

Might be time to start looking for other upper PCBs. Perhaps an LCD replacement will suffice although I've read they are quite difficult.

Also should I be applying this to the general area from which the double sided tape came or am I missing the connecting point entirely?

Is it safe to do while the DMG is on?

I have vertical lines on my DMG and have tried applying pressure to fix them even going so far as to apply a low heat soldering iron to the ribbon to no avail. I've been able to see little black marks approx. in scale with the missing lines, could these be impurities on the ribbon?

Also I cannot get all the pixel lines to fade/discolour as I have seen people do in most of the guides. Am I simply not applying enough pressure?