Display stays dark

want to make a first test ...
have finished megadrum synthex pcb v2.8 with all components.
Windows XP recognized the megadrum and installs driver.
BUT ....
the display stays dark
Do i have to connect all buttons and encoders before everything is working and the device is booting with
a bright display????
or is something wrong with the pcb at this stage????
Hope anybody can give me a hint ..... thanx a lot
greetings Arno
have finished megadrum synthex pcb v2.8 with all components.
Windows XP recognized the megadrum and installs driver.
BUT ....
the display stays dark
Do i have to connect all buttons and encoders before everything is working and the device is booting with
a bright display????
or is something wrong with the pcb at this stage????
Hope anybody can give me a hint ..... thanx a lot
greetings Arno