Re: Prewired 16x2 blue display
It seems the problem is mainly about soldering technique or general electrical repair.
One tip I have is to plug the female connector on to the male connector. Use quality solder and additional flux. along with a clean tip.
Solder a pin near each end then move around so you don't heat them in kind. A bit like tightening lug nuts on a wheel.
Raduino bracket and Ham_Made_Keys