Broken of flush-casted terminal - how to solder a wire on it?

[Bigman]

Hi, the picture below shows the back of a miniature loudspeaker from an in-ear earphone.
There have been two pads for soldering  electrical contacts on it. On each pad I was able to solder a wire on. But it took no 30sec. and one pad broke off.
So what you see on the picture now is:

• left: the pad which did not broke of
• right: at this place was a pad the same size as on the left side. But now, after it broke of, all what remains is a very, very, very tiny spot where the broken off pad was connected with (assumption)
• top: the tip of a needle, to give you an impression how small all this is.

For me, it looks like the only possibility to solder anything on the tiny spot would be with a laser and a microscope (both I don't have). Any ideas, how I could solder this, with an hobbiest standard equipment (normal soldering iron)?

Thanks!

[Ian.M]

That's FUBARed, unless you can manage to grind away enough of the board surface to expose slightly more of the hair-thin wire end, then epoxy a copper foil pad pre-drilled to let the wire end through so it can be soldered.

Your best bet if the earpiece is worth enough not to simply scrap it, is to try to cannibalise a miniature speaker of the same dimensions and similar DC resistance out of cheap earbud headphones or similar.

[RobertBG]

Have you had any luck with this?You might be able to bypass the pad and solder a lead elsewhere on the wires from the voice coil but I cant see from the picture.

Worse case you can probably locate a replacement speaker if you look in the right places as it's doubtful they manufacture them.

Good luck

[free_electron]

silver epoxy paint.
put a dot on it. let it dry then solder a wire to it

[Bigman]

silver epoxy paint.
put a dot on it. let it dry then solder a wire to it

wow that is a total new idea ... and sound's great. This is the next approach I will try. 

(because up to now I haven't been able to fix it. I also don't see a chance to open the housing in order to place a wire somewhere else. Tomorrow, I might upload a picture of the housing, so you will understand).

[lowimpedance]

silver epoxy paint.
put a dot on it. let it dry then solder a wire to it

wow that is a total new idea ... and sound's great. This is the next approach I will try. 

(because up to now I haven't been able to fix it. I also don't see a chance to open the housing in order to place a wire somewhere else. Tomorrow, I might upload a picture of the housing, so you will understand).

Not sure it will take the heat, however a big enough blob might just glue the wire directly with no solder needed.

[Brumby]

Make sure your wires are laid out the way you want them and that you can test your efforts exactly where the speaker sits.  When you have success, don't move a thing!  Put a drop of hot melt glue, silicon, epoxy or something to take the mechanical stresses of wire movement away from your fragile connection - and wait until that has set firmly before doing anything else.

It would be really annoying to have a successful repair fail as you refitted the speaker.