Zorin 15.2 Lite 32 Bit VGA cable works but audio cable to tv doesn't?

Is that "small black hole" for a 3.5mm jack (i.e. like small headphone jack) or something different which may be connector for optical cable for audio. Photo would be useful.

Have you opened alsamixer in terminal and checked that none of the sound outputs are shown muted?
(I am using Z15.3 Core so not sure if alsamixer is included in Lite)

Also see this thread which may help: