the case is that , the imaging of the iPad is perfectly fine, but I have this difficulty in touching when touching certain parts of the screen (ex. when I am typing a message, at some point, the point where letter A, and N located isn’t functioning at all.. i need to rotate the screen for me to type the letter A and N..) should I replace the LCD ? OR IS it ok if I only replace touch pad or digitizer? pls do give me some advice