I have a 55" led tv, the light was blinking constantly and the set would not turn on. After checking the pwoer supply and veryfing correct voltages I unplugged and then reconnected the cables from the power supply to the main board, main board to lcd unit, and 2 connectors from the lcd board to the screen. After doing that the backlight came back, the screen is normal, and the set turns off and on normally. It would appear that the connections from the lcd board to the screen needed to be reseated.
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