Electronics > Beginners
Can you recommend a good vid for desoldering please?
HobGoblyn:
Have just tried to desolder a switch (from a towel rail timer) that seemed to have a ton of solder holding it in.
It's not an important thing as in I've replaced the timer, it was more out of interest in seeing if I could see what was what.
The way it was made is the spur switch on the front of the timer was soldered onto the PCB meaning I couldn't remove the PCB without desoldering the switch.
I have a new Hakko FX888d, decent flux, MG solder wick and a desolder pump.
First I tried with the Hakko on 350, didn't begin to melt the solder, then I tried at 450, it would melt, but took a good 5 - 10 seconds before it did so (this was straight onto the solder, not using the wick). I tried sucking it up, it got a lot, but left loads.
I then tried the wick, both as it was, and with a bit of flux added. I still really really struggled, in the end I gave up.
I've since watched a couple of vids that suggest putting leaded solder on first. I wondered if anyone could point me to a beginners desoldering guide vid? (I found good how to solder vids searching this forum)
I also have a hot air station, I'm wondering whether I might have been better using that to get the board off of the switch?
I've included 2 pics, first showing how bad my desoldering attempt is, second showing how much solder is on all the joints.
many thanks
HobGoblyn:
Watching the Pace how to solder videos from the 80s, I suspect my main problem was too smaller tip. But any pointers much appreciated.
tautech:
Being proficient at soldering for repair work is prerequisite otherwise you can do more damage than you're trying to fix.
Practice salvaging parts of old boards.
Understand thermal mass and the tip sizes needed for good thermal transfer.
Understand dwell times that are appropriate for a particular task. Often hotter and faster is best.
Get a solder sucker for when joints have large quantities of solder to remove.
Think of braid as a clean up tool only.
Use leaded solder, none of that Pb free muck !
Suckers will often pull the solder clean out of holes but occasionally you need new clean solder on the joint and suck it off again.
tester43:
hours of fun with Louis Rossmann on youtube.
He is resoldering parts of computers but you will get the point:
1. no such thing as "too much flux" exists
2. fresh solder applied also for cleaning
3. solder removal pump is non-optional
tautech:
--- Quote from: tester43 on January 24, 2020, 03:36:50 pm ---3. solder removal pump is non-optional
--- End quote ---
They are a valuable entry level tool for little outlay.
Some are better than others.
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