Many devices have "sleep timers" to turn the appliance off after a period of time during which you have supposedly fallen asleep.
This setting is configurable. Break out your manual, or find one online to find out how to enter this setting.
You might also try your remote, looking for some button cleverly disguised as "Sleep", or some such. Might also be hidden in a configuration menu somewhere.
SOURCE: tv works like 10 min.then retrace lines appear,
the model number 53fdx....etc is not a Toshiba model number---It is a Hitachi model number.
First if it comes on and you get trace lines before it shuts off----does it just get very bright and if so does it get bright red, green, or Blue?
if one of the picture tubes or the circuit around them has a problem you can get this and the set will shut down because it detects something is pulling way too much current.
I would be happy to try to help you but look at back of your set for brand and model number and if possible try to give me a better idea of what the picture looks like before it goes out.
SD TECH
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