Dont know how to do a channel scan on my samsung 2333hd t.v

Using the Color buttons on the Remote with the Channel List.
• Red (Antenna): Switches to Air or Cable.
• Green (Zoom): Enlarges or shrinks a channel number.
• Yellow (Select): Selects multiple channel lists.
• TOOLS (Option): Displays the Add(or Delete), Add to Favorite(or Delete from Favorite),
Timer Viewing, Channel Name Edit, and Auto Program menus..

Auto Program
The TV automatically cycles through all of the available channels and stores them in memory.
In rare cases, "Auto program" may miss a few channels due to weak signals and the channels may
not be added to the channel memory.
• Air
• Cable
• Auto
MENU → arrow up, arrow down→enter → arrow up, arrow down→enter →arrow up, arrow down →enter →arrow up, arrow down, arrow left , arrow right →enter → MENU,EXIT.

Hope this helps. I have the owners manual on file.