Samsung PL64E8000GFXZP - Manual (Page 587)

The Channel menu is only available
when you select the TV source.
Your settings are lost after 30 minutes or
every time the TV is turned off.
If the TV is in the Store Demo mode,
it will reset audio and picture settings
every 30 minutes. Change the settings
from Store Demo mode to Home Use
mode using the Setup procedure. Select
TV in the Source using your remote,
and go to System
→
Setup .