Chosen Solution

My back plate detached and disconnected three connectors. I soldered two wires,, which appears to have fixed the charging problem. A ribbon with a “chip” like bracket at the end is also detached. I cannot get it to line up with the electronics within the body. It appears to be the heart rate sensor and activity tracker. Any help welcome.

Review this teardown Apple Watch Teardown to get an idea how things fit together.