Samsung UE40ES7000U E-Manual page 230

device containing music or photo files
you want played when the TV turns on
automatically.
N
If there is no music file on the USB
device or you don't select a folder
containing a music file, the Timer
function does not operate correctly.
N
If there is only one photo file in the
USB, the slide show will not play.
N
If a folder name is too long, the
folder cannot be selected.