The TV has been on since morning.
The TV has been running since morning.
Please check them.
"On" is the word you want, but "since morning" is a bit off. You can't really have anything since twelve hours. I would like to see "since this morning" or "since X o'clock this morning".
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"On" is the word you want, but "since morning" is a bit off. You can't really have anything since twelve hours. I would like to see "since this morning" or "since X o'clock this morning". But perhaps you mean "all morning".
kumenglishThe TV has been on since morning.
The TV has been on since 7 am. morning. (You need a particular point in time after "since")
The TV has been on since before breakfast.
The TV has been