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I have replace my Iphone 4 screen?

following the steps- problem is now the screen works (it switches on) but… the touch screen doesn’t work what part have I attached incorrectly???

frollard5 years ago
On replacing an iphone3 screen for a friend, a slightly different pinout was used between 3g and 3gs, and the digitizer didn't work with the wrong one as the plug was very very slightly different and didn't stay connected. Ensure you have the right replacement screen/digitizer.

Pop it back open and ensure ALL the connections are solid. You can power it up before the unit is closed to make sure the touch works.
Touch screen is separated from display, pay attention to the black ribbon near the button. You should disconnect it before change the display. But maybe is not broken. Check connections and try again if not working, then you may need to buy a new one.