Help with Toshiba 55" flat screen. Blinking light, shuts off.

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Jan 25, 2019
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I have a Toshiba 55" model 55L621U TV. It's always has restarted itself intermitantly while watching it. But the other day while it was on, it shut off and wouldn't turn back on. I unplugged it, and plugged it back in several times. Each time, the splash screen comes up, the red light blinks about 4 or 5 times, then the TV powers off. I'm guessing probably one of the boards went bad (of course it's 2 years old and out of warranty). Can anyone help with which board that needs replaced? Thanks in advance...
 
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