Place the LCD on top of the touch screen, with the two ribbon cables pointing towards the battery board (as shown in the picture).

Make sure that the edge of the LCD is flush with the black plastic frame, or you will not be able to reassemble the unit.

Make sure that both the white and pink cables are tucked into the "groove" formed by small plastic pegs; they must not overlap the screw threads or the buttons, or you may damage them while reassembling the device.