Make sure the battery is disconnected before you disconnect or reconnect the cables in this step.

Use a plastic opening tool or a fingernail to disconnect the three front panel assembly cables:

Front-facing camera and sensor cable

LCD cable

Digitizer cable

When reassembling your phone, the LCD cable may pop off the connector. This can cause white lines, or nothing at all to appear when powering your phone back on. If that happens, simply reconnect the cable and power cycle your phone. The best way to power cycle your phone is to disconnect and reconnect the battery.