Samsung UN46C6400 turns off by itself all the time

[snpower]

Title describes the issue; the class action settlement covered some TV's that would not come ON. Hoping someone can help me diagnose/repair... I have the power supply out but not sure what to check. TIA.

 

[Viinerpedro]

Is it like this: http/www.youtube.com/watch?v=1vSPVBJ0n1M