Hi there,
First make sure the video inputs are not locked using these instructions:
To set up the video lock:
1. Press MENU, then press or to display the LOCKS menu.
2. Press or to display the password entering mode.
3. Use the Channel Number buttons (0-9) to enter your password,
then press ENTER. The LOCKS menu appears.
4. Press or to highlight VIDEO LOCK.
5. Press or to select:
• OFF: Unlocks all video input sources.
Then it appears that choosing Video 2 using the TV/VIDEO button should enable the front input.
An entire manual is avialable here that should closely match your tv:
http://www.tacp.toshiba.com/tacpassets-images/models/27DF46/docs/27DF46_om_E.pdf
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