why my lcd dosnot work?

i have an lcd (ts1620a-21/b) its not working . i dont know why. i have connected it to an mega16. all pins are ok. the pin configuration is ok. but there is only a row that turns on. i have 2 of this bot non of them are working

**broken link removed**

There is an instruction in there that sets 1 or 2 line mode.