I have a DSi that is in very good condition but for the right shoulder button. It does work but I have to press very hard to get it to register. The “lift up the button and blow into it” does actually improve the function of the button for a bit (I use canned air, not moist mouth) but it doesn’t take long at all to NOT work either. Does anyone have a REAL solution that actually works short of disassembly and replacement of the button?
Haha, yeah, I still occasionally misalign those tiny things, even after working on lots of them! (Also I probably hate flex cables and their connectors more than you do.)
I’m really happy it worked for you. Have fun with your newly-fixed system!