If you mean while you're trying to take a picture, one configuration option for the F700 is to turn off the LCD when
taking pictures and use the view finder-- this saves battery power. If
you press the DISP button to the right of the LCD should turn on.
turn the LCD back on-- Press MENU/OK (you should see the SELF TIMER
screen). Press RIGHT ARROW to select the SET option. Press UP ARROW to
select the SETUP option. Press MENU/OK. You should see the SET-UP
screen. Use the UP/DOWN Arrows to navigate the options; use the
LEFT/RIGHT Arrows to cycle through the options. The IMAGE DISP and the
LCD options control when the LCD is powered on.