Originally Posted by
darkskypoet
Its not that you are trying to melt the old... Its that you don't need to. (at least I think...) You would just need to solder the new wire, etc down to that point by melting the new solder, I think you would lay down the new solder first then the wire and more solder.. its so you have 'glue' on either side so to speak. At least I think this is how... (please someone correct me if I am wrong)
I would anticipate on something like that card, the solder they would use would have a higher melting point then the little stuff you'll use to tack your wire down to it with. Mainly because its done in a large industrial setting, and ofttimes has to bind components onto the pcb... Further, it'll be designed to take a huge thermal load over and over and over again... So I doubt they'd have used something like what you will be for the little mod.
So correct me if I am wrong... but you aren't meant to, and don't need to melt the existing solder points. Instead your soldering something onto it... and as such, only need to melt your solder so it 'sticks' to the existing point and holds your wire in place with good electrical conductivity.