65" Samsung 4k Smart Mainboard and LVDS ribbon cable that feeds the T-con board.  This board came from a good working TV that the leds went bad in. Upon trying to replace  the leds, I noticed the diffuser screen was melted, so I just harvested the good working boards out of it. Still had a picture  and sound, just no backlight, so this board is still working like it should. Please be sure to match up the numbers from your original board before purchasing.  This model is known for its Leds to go bad, so make sure that is not your actual problem.