Default Screen problem HTC One X AT&T

I've had my HTC One X since the day it came out and love it but I had a problem that turned out to be the motherboard for the phone. I fixed that by finding someone with a broken screen white version from AT&T and bought that since my screen was fine. I switched things around and gave it to my son so he could get away from a Windows phone was using. About a week ago there would be weird texture issues on the screen where the fonts looked to tear almost and then when playing games it would go to a screen of different colored pixelsWeird Pixels. Anyway I have taken the phone apart and checked all the connections but I am at a loss and as a matter of fact the phone just sits there on the same screen all the time now so I made it worse.

Anyone with similar experience that has a better idea? Thanks.
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