If all your functions work then you only need a glass repair, think of the digitizer as the screen that collect input (so if your touching and scrolling works then that's out of the equation) then your lcd deals with what you see,(if it's blank or ink is running from the screen then you'll need to replace that instead) if it comes down to that you might as well get the full package. So in your case your screen only needs a glass replacement which should amount to $20 at most, good luck