My audio interface has a headphone plug soldered directly to the circuit board. Over time it has worn out, and there's an intermittent circuit when the plug is wiggled, and is unreliable. I will bring this wire out of the box to a TRS plug dongle. I am just looking for some simple beginner advice to solder a wire onto the circuit board in place of the plug itself, hoping to get the best contact possible.
IMHO the connector probably needs to be replaced because its probably cracked somewhere, but I've seen poor soldering at jacks before too, and in those cases, glueing the connector on the top side and soldering the bottom side properly fixes the issue.