Try ADCON1=$0F

case not working

Are you using PICSTART ??? Are you able to BLANK PIC and check for BLANK ALL ???

Is anything else work with...like LED Blink...

Did you set config fuse to HS OSC??

Is those define do something better

DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50

case else try increase to previous to higher values...