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Old 06 November 2018, 13:26   #29
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Join Date: May 2010
Location: Helsinki, Finland
Posts: 1,305
Solder will not stick to cold parts; you need to get both the board and the jack hot enough so that solder will melt on contact with them. Generally speaking you never apply solder wire directly to the soldering iron itself (except to have a thin coating on the tip to facilitate heat transfer).

With large copper planes on the motherboard getting everything up to temperature can require considerable power from the soldering iron. A larger tip may also help. If there is a big mismatch in the size of the parts being soldered, you probably need to first heat up the larger part in order to not overheat the smaller.
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