Touchscreen is not working

I`ve cracked my Iphone 5c screen after a headlevel drop , 2 weeks after my touchscreen started to not respond sometimes but when i was touching my phone a bit hard it started to respond. 3 days with this issues and then suddenly 1 morning my touch was dead .. I was thinking that it is cause the broken screen, i bought new one, but touch is still not working , (the screen is OK it works i do some things with siri ).. i tried my old screen on other phone and its working .. can it be fixed or its totally dead ? One friend said that his phone has the same issue and from the shop they have said to him that its from the board and it can`t be fixed but i am still hoping that my "green weapon" will work properly again :)