Samsung PL64E8000GFXZP - Manual (Page 586)

over time.
The TV Signal Information is unavailable in
the Self Diagnosis menu.
This function is only available for
digital channels the TV receives from
an Antenna / RF /Coax connection.
The TV is tilted to the side.
Remove the base stand from the TV
and reassemble it.
The channel menu is grayed out
(unavailable).