Headphones were tugging or yanked enough to wear out the connection, and I found these instructions invaluable. It was enough for me to get the back panel off.
The back panel has the headphone jack (visible in your last image). I stretched the spring connectors out to give more pressure, but the real problem were the pads on the flex connector -- a couple of them had holes worn in them. I applied a light coat (a dab, followed by a touch from the desoldering braid) of solder to the pads, reassembled the unit, and it works like a charm. I hope this helps anybody who has a flaky headphone connection.
Sobald er das hat, wird er in der Lage sein, eine Grafik zu seiner im Laufe der Zeit erlangten Reputation zu sehen.
Hier ist eine Vorschau, wie die Grafik aussehen wird:
Noch keine Reputation erlangt.