Hi i was watching my television when it went off , when you which it on the yellow on light flicks on but before it can go on it goes back to standby mode.
If you even which it on from the main switch it does the same thing.
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Only the older Analog type televisions get snow from lack of signal. The modern Digital TV gets pixilated. like missing pieces.
And on re-reading the title of your question, it does say CRT...... As in Cathode Ray Tube. (I thought they were all gone now, all around the world) Anyhow.... has your country switched off it's analog tv transmissions. This would give you snow. Because there is no Transmission. Seems unlikely they would stop transmission in the middle of what your watching.
Do you have a Digital Set Top Box feeding the TV? This would pick up Digital TV transmissions and convert them to your old CRT TV Screen. Knowing this should help you diagnose the problem.
Check the antenna input to your digital box and connections from the STB to your TV. They probably use a Yellow video cable and a Red & White (Sound Left & Right). You didn't mention if sound was still there?
Perhaps someone has pressed the remote control and the TV has jumped to one of the Antenna Channel inputs rather than the Video input (Yellow Video input)?
Might be that Simple.....
open the back cover then tried to dis connect the supply going to the inverter board for the screen back light whci may cause of shut off. let see if the indicator will stay to green and not turn to red.
Model listed in wrong area of site, suspect a bad board and with this brand suspect no boards will be available or found--have a shop look if you like but this particular brand is known for no support.
What model is your Sony and how old is it and has it been moved recently?
It sounds like there is a connector loose or a component not quite making a good connection. I'd recommend finding a reputable TV repair shop. Like finding a good car mechanic, I'd ask around local folks you know.
Sounds like no signal? you know how monitor lights blink on and off when the computer is off? is it similar? check all your cables. Try a different source, vcr? video game? camera? try a different cable too (for the video)