I was writing to CircuiCo support by email to give some solution to this problem and they answered me for a few days.....
At first time i solved it connecting the LCD with another voltage source and it was running properly!!! :), but i pressed the reset buttom of the screen with the same voltage source parameters and it was not working anymore :(. I report it to CircuitCo all what happened me and they didn't wrote me anymore....
If you solve this problem changing the LCD voltage drive IC TPS65105PWP tell me plz and i will try to change it.
Thanks