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Wouldnt it be nice if it would say " Picture is about to go off because BLANK is bad and tell you what is was lol.. Anyway.. IF your set is an LCD tv then here are some symptoms and causes
Main pcb common failures picture and sound will at random just go off with a black screen. Green power light stays lite.
Power supply: depending on severity normally set will cut off and power light will go off or blink
Inverter board. Picture will go off but generally audio will continue to work
The panel (screen) itself could be going bad as well. Sometimes if its the panel you can tap (kinda hard) lets call it a love tap lol... across the top of the screen. If it starts working again then suspect the panel which costs more than a new tv..
There wasnt enough information in the complaint for me to rule some of these out for you. Hope it helps....