Be sure bnc jack nut is tight if applicable and with a drop of glue to prevent future loosening before, soldering contact back to board and bend contact down till it touches board contact also, before applying solder for a stress free joint. also lightly scrape both solder contacts till bright and shiny and apply soldering paste first if, you have any but, not a must. Just be sure to use rosin core solder with silver content if you want just be sure, not to use acid core solder you can also take a q tip with alcohol and clean the joint up when done if you desire I always do since it's easier to see if I have a good joint . You might already be aware of a lot of these steps but, I listed them just in case good luck and MERRY CHRISTMAS TO YOU AND YOURS!