Remove the five cables near the top of the logic board in the following order:

Headphone jack/volume button cable

Front facing camera cable

Digitizer cable

Display data cable

Power button cable (located underneath the headphone jack/volume button cable as shown in the second picture.)

To disconnect the cables, use the edge of a plastic opening tool to gently lift their connectors up and out of the sockets on the logic board.

Be careful not to break any of the small and delicate surface mount components as you disconnect the cables.