I use a 60/40 solder I bet its fine I would take the leads off and try again after watching this video I recommend getting the qsb to install it instead of direct wire connection be sure to remove old solder. [ame="http://www.youtube.com/watch?v=I_NU2ruzyc4"]How and WHY to Solder Correctly - YouTube[/ame]
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If you need to practice on old/useless pcb instead of on you xbox mobo.