iPhone 6 Screen not responding to touch.

Hi, I’ve been restoring a wrecked iPhone 6 to new condition and unfortunately the original screen was smashed to pieces and flex cables were ripped. So I purchased a new screen assembly(front camera etc included) and a new housing as the original was bent moved everything over, phone worked perfectly except the touch screen. So I assumed bent iPhone 6 = touch disease (even though it showed no grey bars or other symptoms) thus I tried re soldering the touch ic chip. Finished doing that and the iphone still turns on but still no touch.

The new screen assembly works with touch on a test phone so it’s definitely not the screen itself.

Any help would be greatly appreciated, Thank you.