Disable the touch screen connector and remove the motherboard. Interfere only speakers that will remain on the board hanging on wires.
LCD screen on the motherboard:
Body with a broken old screen:
Old broken screen keeps on double-sided adhesive tape. Its just otkovyrivaem from the body.
Glue the new screen in the case, set the motherboard and connect the ribbon cable to the display board.
Install the rear cover (see, to all sorts of side buttons are in place), turn the screw, connect the battery and a second cover dress. Turn on and check. Although ... if in doubt, you can enable the device to the assembly to make sure that the cable is connected securely and the new screen works.