Remember door number one's mystery connector? Surprise—it was the home button cable!

This discovery is a bonus to the S5's repairability (and a classic lesson in the need for repair manuals)—disconnecting the home button cable from the start would have made the display removal much easier, and will certainly aid in reassembly.

Present and accounted for is the expected fingerprint scanner tech. The control chip is labeled 1200P E43F2.

Some say getting this print sensor to actually work requires a bit of persistence.