How does one replace a NIC?

As I wrote a few days ago, the RJ45 connector on my laptop is a bit broken. So, I went to my neighbour's house (the one who sold me the thing), and handed it over to him on Saturday.

Today, he mailed me telling that they need to replace the logic board. I haven't heard much more details (could be that it is broken, too), but if the only way to replace that connector is to replace the entire logic board, then something's wrong, I'm afraid...

Anyway. He's told me that I should have my laptop back by Wednesday or Thursday. I really hope this is true; I had my (previous) laptop in repair on last year's FOSDEM as well, I don't want to have to go to FOSDEM without one two years in a row...