Soldering Help

You got good advice on what to use. My question is, Why? Before you go applying a lot of heat it is good to know where and what and why? Because you can buy all the greatest gear, and then if you don't know what you're doing easily overheat a trace and trash a circuit board. 

My advice is once you get your stuff take a few wires twist them together and practice soldering. Get a feel for how heat flows into metal and how solder flows to the heat. What you want is to get the part hot enough all you do is touch the solder and it flows right into the joint. But not so hot it starts melting plastic and insulation. Takes a little practice to get the hang of it which is why I suggest start with scrap wire not expensive preamp.

+1 on Cardas Eutectic and WBT.

All silver solder I've see contain lead.

Practice makes perfect

Where on east coast? I'm in Central NJ, lug it over to my shop!

It’s always a great opportunity to learn, add an accomplishment, increase your self worth. It’ll sound much better if you do the job yourself!

If tight or tricky, not one to learn first: my local electronics parts store will make repairs. or, a computer repair shop. you may have a source close for this.

during deep covid, the repair dude worked from home, so I dropped a tricky job off, out, back in, pickup.

is it just a ground, not important signal path? there are conductive adhesives you could use for a semi-permanent fix, scrape it off and re-do later.

https://www.amazon.com/Conductive-Adhesives/b?ie=UTF8&node=401542011

Cardas solder is very easy to work with.  Actually, it sometimes helps to melt your existing solder points with a tiny bit of Cardas solder.  A lot of cold solder joints are hard to heat up and melt.

I know you are not serious about doing soldering, but avoid those 25 or 30 watt hobby level soldering irons.  You really need a good power supply and solder tip heating element to keep the heat constant and hot enough.  You should consider anything that is at the 60 to 75 watt level.

If you have a digital soldering station, I would recommend temps between 350 and 399 degrees Celsius.  Do not go above 399.  If you are using a larger tip (such as a 2mm or larger), I would try something between 350 and 370 C.  I have seen traces being lifted off the board with large tips at 399 degrees.  I would be conservative on initial temps because not all soldering stations may show actual temperatures.  Start around 350 and work up from there if you really need the heat.

WASH YOUR HANDS after you work with solder or soldering tools. Like others have said, lead is still a component in many solders.