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Which lights are blinking?
What color are they blinking?
This sounds very like a faulty power supply board - can you try replacing it and let me know if the TV powers on normally again?
Yes CN801 is on the PS board.
15.99V is sufficient.
All outputs should be checked to ensure the PS board is functioning correctly.
The LED driver board is easily checked through its output - it either gives a display, or not.
I cannot find the schematics for this particular set, so I'll check with the other techs if they can assist you further.