How do I fix intermittent colored vertical lines on replaced display?

Ok, when i got the phone back it was also doing some horizontal lines. So I stripped the phone back down. Found a couple of tiny slivers of glass embedded in the glue on the mid frame, cleaned and carefully seated everything. Used alcohol and lint free cloth. Felt a clear snap with each cable seating. Result: worse than before. Lines are mostly horizontal and are nearly constant. Interestingly some screens are clear others very problematic. Images seem to be the worst so it is almost a resolution thing. Solid basic colors are most clear but nothing is completely free. Actually just turned it back on and it quickly degenerates into a mass of vertical mostly grey vertical lines rendering the phone unusable. Help.