Bn44-00709a repair.txt part of samsung Ue40h6400awxxh Bn44-00709a repair.txt, Led flashes twice black screen no backlight no audio. text manual preview

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no voltage on tcon board.A13V= 10V no matter stby or power ON.
When disconnect 18pin power connector backlighting leds flash rapidly.
solution: check primary side
near optocuplers zd821 with mark Y4=15V smd zener diode
if shorted replace it with new one.