Chosen Solution
So the phone is pretty badly smashed but half of the touch screen still works, the other half just has coloured lines down it. If I replace the screen will that make the full touch screen work again?
@shannley yes it will for as long as you replace it as an assembly. iPhone 8 LCD and Digitizer Replacement and here is the part iPhone 8 LCD and Digitizer
iPhone 8 Screen This part replaces the entire assembly - both the LCD and digitizer (as well as the camera and earpiece). So, if you buy the part from iFixit, it will also make the full touch screen work again.
