Samsung UN55ES8000GXZE - Manual (Page 213)

N The availability of captions depends
on the program being broadcast.
Default / CC1 – CC4 / Text1 – Text4 :
(analog channels only) The analog
caption function operates in either
analog TV channel mode or when a
signal is supplied from an external
device to the TV. (Depending on the
broadcasting signal, the analog caption
function may or may not work with
digital channels.)