had a similar experience on an 8210 when you go in messages the screen goes blank. Well i jsut changed compelte dispaly + keypad part (from anotehr workign one) and it worked ok.
Dont ask me why or how.. i just by mistake exachanged it and it worked. seems it had some fault that dispaly+ keypad (ie change the compelte set not just display)
hope it works 4 u 2
br
alv |