Here is picture how to disassembly nokia 6600 slide
Lcd join with double tape, round clipper
Unclip/disconnected lcd connector.
After open the two screw, you can remove front cover.
After open you will two screw, Open this two screw.
Round clipper to open this part.
Disassembly / Separate engine module
Disconnect lcd connector ( as shown)
Open the back cover
After keypad removed, you can see two screw, open the two screw and pull housing as direction shown.