Power cycling issue samsung tv

Tv turned off while watching now try's to turn on but won't and the red light blinks each time the screen lights up but turns off again,, constantly keeps trying to power on.

i pulled apart and disconnected main board tv backlit stays on, then reconnect turns off, i then disconnected two ribbon cables that go to bottom of tv and of one of them is not connected it stays on but both of them connected it doenst