I'm back
My problem itīs that:
In the beginning of my project i had a problem wiht backlight but now it works putting My Vcc at +5V.
My ideia of putting two diodos at the end of my regulator itīs having my PIC with one isullated suplly, and the rest of my circuit with one different suplly. I'll have one independent +5V to the PIC...
If i put PIC, LCD, 373 with the same suplly it works, but if i put PIC, LCD, 373 and 245, this is all circuit with my output regulator it doesnīt work.
This morning i'll try doing more tests then at the end of the day i'll tell you more thinks...

Note: sometimes i donīt say too much because i donīt write very well in english.