Hi Group, I have a Samsung TV # un50h6201af has backlight no picture no sound. Power supply has all the normal voltages,. I changed the Tcon board and main logic board, still no pic. I have 12v on both sides of fuse on the Tcon board, still no pic, there are three blue led's lit on the Tcon board. i disconnected the ribbons to the panel one side at a time.. nothing. is the panel bad.???