Hi Fraser!
You are great, and done great job ! Thanks for information!
I disassemble my thermal camera again. Look at that damn wire), take couple of photos.
Now, the end of broken wire located slightly above the ball (little gap between them), almost parallel to contact pads panel.
Oh.. I think it near to impossible to solder that wire..
What about silver-filled glue, it seems like real solution. Now in my hand is that glue. As in your case, it for auto rear window heater strips repair.
But in my case it looks too thin. Almost like water. Stated as "containing metal powders silver, gold, platinum, palladium" Hmm .. Don't know about palladium, rather seems like aluminum paint) .I tested it, drawing some lines on the plastic film. After about 30 min, painted trace become quite conductive. Looks promising, but that glue almost not forms a layer or drop (ball). I doubt that can be used for repair. If only try to apply repeatedly...
If I left the vial opened, maybe the glue will evaporate solver and tend to thick..
What kind of your glue? Is it solver based or epoxy resin?
Best regards,
Andrew
PS.. to make it clear... broken wire is 14th from left, not 13th, as stated on first picture