If the Touchscreen is not fully displaying the image fully i.e it's off centre, you can press a button combination to realign it.
On the back of the touchscreen you will see 7 buttons as illustrated below. (Dismounting Instructions can be found here)
Please press these lightly with a pen or paperclip in this order: B > A > A > C > C
Once this is complete, your screen will have realigned and can be used straight away.
A handful of screens use the Crystal Displays AD Board, this is a strip across the top of the back-plate.
In order to realign the screen, you want the Tool menu and reset position.
Left to right, 1 to 6:
Press the combination 6 > 4 > 4 > 6 > 5 > 5 > 5 > 6