Electronics > Beginners
GROUND wire won't tin... Not a noob question.
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vealmike:
https://en.wikipedia.org/wiki/Tinsel_wire
?
The stuffs impossible to solder, the nylon melts and coats the copper before the solder wets it.
pwlps:
I had a similar problem several times when trying to repair broken headphone wires. These were thin stranded wire coated with varnish, no way to solder with a standard organic flux.  Strands were so thin that when I tried to scrape off the varnish with a blade they usually ended up breaking. Then I found this trick on a radioamateur site (I forgot were it was)  :  I put a big drop of lemon juice  :) on the wire then tried to scrape off the varnish gently with a hot soldering iron tip, repeating it several times the varnish eventually went off.  This worked at least with with copper wires, however on another occasion the wire was made of something else (some alloy or stainless steel, I don't know) and the lemon juice wasn't quite enough to have the tin stick to the wire, then instead of lemon I have used a diluted orthophosphoric acid (used as flux for stainless steel soldering and that I borrowed from our mechanical workshop).
IDEngineer:
We see this in small BLDC motor wires once in a while. Often generous application of flux - rather than just relying on what is in the solder's core - gets the job done. I love all the other, more exotic ideas in this thread but I'd try the simple ideas too... whatever works!
CheekyRobot:
Well, in the end I soldered the compliant wires.... and then twisted the others together and packed it all up with a goodly amount of duct tape.
Video signal looks good and crisp. This may end up being an annual event though....

but... twist and tape... I just feel DIRTY now  :-[

viperidae:
Instead of twist and tape, you could crimp it...
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