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So i been having my iphone 4 for about a year now my screen was cracked when i got it. I been having problems with the touchscreen not responding so i took it for a screen repair but my screen still didn’t work even though the guy would say it would. do i have to repair the LCD for the touchscreen to work again

Is the screen touch not responding in the same location?? It could be faulty but in rare cases it can be the motherboard causing the problem.. Had this problem b4 with the motherboard tryed 3 screens and no luck all screens worked 100% in my test phone