How to repair the connector for power adapter (in phone)

If it's an E71 and I assume is same as E71x, then just look on ebay for a replacement power adapter socket. You'll need to find other vids on taking the E71 apart but it's easy to replace the socket. Had same issue on mine but I replaced doing the above.

Issue is getting the casing off and back on without cutting the ribbon cable that is on the right hand side of the phone. I've nicked mine but appears to be just related to the volume. So got a working power socket but now can't turn the volume down :)

Still, was worth it to replace the faulty socket.