Thanks for asking me some pic!
From one pic (http://imgur.com/q6LbIED) I noticed a strange solder on the TXD pin, I checked with a multimeter and that damn pin was bad soldered.
I fixed that soldering and I tried to upload a sketch: it works!!
I'm soooo sorry for this trouble, without that picture of the circuit I couldn't notice that strange solder... I solved the issue and I don't need a new ESP12 anymore.
Taking a picture of solderings may be a good practice to find a bad solder because there aren't reflections and you can zoom in!
Thank you all for the help
Big