I've yet to find TV repair techs to visit here. I'm just an electronics designer and software author.
http://support.toshiba.com/support/modelHome?freeText=3606746 has a troubleshooting link but for most of us, unplug and wait then test is all the TVs today offer.
Try the on/off button on the set and fresh batteries in the remote then check warranty and get estimates.
TV would not turn off unplugged and waited a minute, plugged back in, now it won't restart, no on/off light either

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