Can anybody please help, how do I get the subtitles up on a trinitron television? Nothing seems to work

Trinitron is the name for a specific type of display tube, patented by Sony.
There are too many different Sony (Trinitron) television types, to provide you with the requested information.
As a minimum requirement you have to state the TYPE number of the television set.

:)

Sorry to have kept you waiting for your kind response to my query , there are two numbers on the Sony installation leaflet KV-21M3U KW-21T3U I do hope that this will help you to help me, Best wishes Maureen