You may have bad power and your TV may be reacting to voltage drops or spikes. Is your TV powered through any kind of conditioner,
surge supressor or filter? If not, you should consider getting one even if its only a $100 item. Stay away from standard or computer power strips though.
Make sure it is not overheating and you have plenty of cooling space around the TV both to the sides and back, if it starts to overheat it will shut down. Or it could be a panel or internal board error. You'll need to get
Sony tech to diagnose the problem. Are you getting any blinking lights when it shuts down? these are a code for the techs to let them know what to start looking at .
My television is 19" Sony but I'm not sure about this green light that you are referring to where is it at on the television?
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