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

Use a spudger or a fingernail to disconnect the display data cable connector.

When reassembling your phone, the display data cable may pop off its connector. This can result in white lines or a blank screen 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 connector.