Toshiba 24V4210U User Manual page 49

4 All menus close automatically if you do not make a selection
within a few seconds, except the signal meter menu, which
closes automatically after a few minutes.
5 To close a menu instantly, press the EXIT button.
NOTE
The menu background may sometimes appear black, depending on
the signal the TV is receiving. This is not a sign of malfunction.
Menu Layout and Navigation
Navigating the menu system
49