I'd say YES, you got 3 bad modules. I have about 20 modules in my shed that don't work and need repaired. I FINALLY ended up finding one that worked and have just been using that one.
What needs to happen is all of the varnish/wax stripped off the contact side of the board and EVERY solder point heated with an iron and re-flowed. I think some people have had good results with just heating the solder through the varnish. As long as you add in good electrical solder, that should work. The hardest part is stripping the varnish off.