My TV had the green light flashing 3 times, I took the TV to a repair shop they said it was the SEINE BOARD. I replaced the board; it worked only for a few days. Now the TV will stay on for about 5-40 minutes, will turn off by itself and red light stays on with green light flashing again 3 times. When the set is not on just the green light will flashes. In both cases if I hold down the power button for 15 seconds TV will come back on but will shut off randomly. Does anyone out there know what this problem now is ????????