Hi,
Please remove all accessories from the tv and check for the error. If it's still occurring, please switch power outlets. If the error is still occurring, then the next step will be to factory reset your tv.
If this fails, then you'll need to setup a home inspection from Geeksquad/bestbuy
Thank you.
It appears to be a known issue!
https://www.google.com/search?q=toshiba+55l621u+turns+on+then+off
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