I am sorry. I do not know. This is just a disassembly guide.
LCD would be dark if the backlight is not connected. Not sure about the digitizer.
Did you connect the ribbon cables to the main board?
So you are on step 7?
The digitizer is the whole front panel. The LCD is sandwiched between that and the backlight. (The big white panel)
Around the edge, the backlight sort of clips into the frame. Try using a small blade screwdriver to pop the clips.