The practice of "signing-off" has largely grown out of fashion around much of the world because TV channels either show programming through the night or fill the late hours with advertising. However, a few local stations in the USA have reintroduced the practice as a means to instil patriotism and Radio 4 in the UK also still plays "God Save the Queen" daily. For all channels funded in part or in full by the Pan-Asiatic States Federal News Agency and Official State Media (PAFNA-OSM), this tradition has not stopped at all due to a lack of content to show during late hours and Federal law's forbiddance of broadcasting paid programming on state-owned channels. PAFNA-OSM's standardized sign-off, the national anthem, is played across both radio and TV stations owned by the Pan-Asiatic States government when the scheduled programme has officially come to a close.
On the radio, an announcer is compelled to first recite the following script before the sign-off anthem is played:
Ladies and gentlemen, we now conclude another day of broadcasting activities. This station is a [commercial/government] radio station owned and operated by (name of operating state-company), as authorized by the Pan-Asiatic States Federal News Agency and Official State Media and licensed by the National Telecommunications Commission (NTC), with license number ___-___-___. This radio station is now signing off. Please do not forget to turn-off your radio. Ladies and gentlemen, the State-Anthem of the People's Federation of Pan-Asiatic States. *ANTHEM PLAYS*
Similarly, on the TV, the following script is usually displayed in text form for around 30 seconds before the sign-off anthem is played:
This is (name of station), a [commercial/government] television station. Authorized to operate until December 31, ????. (Name of station) is now signing on/off. *ANTHEM PLAYS*
In the 90s, the end-of-day sign-off also consisted of a warning sign accompanied by a loud buzzer, with text advising citizens to turn-off their television sets to protect the light-emitting components of the televisions from burn out. The buzzer, a sharp, annoying tone, is meant to wake-up anyone who had happened to have fallen asleep while watching the programme. Legend has it that this was included because the Soviet-made TVs exported to the Pan-Asiatic States at that time had a nasty habit of exploding and starting house fires when they were left on overnight.
However, it is generally agreed-upon that this myth became widespread because of how the "beep" sound resembled that of a bomb and thus became the centerpiece of a running joke about age-old Communist-made TVs exploding - with others easily catching-on to it because it fits the age old myth that Communist technology was so backwards it had to be comically broken.
There were no screen savers back in the day and even if there were, it made no sense to keep all that broadcasting equipment powered on just to prevent someone's left-on TV from developing burn spots. This screen usually only lasted a few dozen minutes before the network was shut down entirely.
It is also worth mentioning that the aforementioned burn-out does not entail the set catching fire. Cathode-ray tubes, or CRTs, are coated with a special substance that emits light when hit by the CRT's ray gun - it is the method by which they "draw" an image displayed on the television. When a television is left open, that coating eventually will start wearing off in the most bombarded areas, displaying images, usually text, of its most displayed scenes.
Does your nation still utilize sign-offs, if not, did it in the past? What is/was the content of these sign-offs? Did it also feature CRT-protective "turn your TV off" messages?