I have repaired 10 or so A series Samsungs with the c102 green screen/screeching problem. In those cases the tv would click on and off with the screen and sound problem. I fixed a 46" model today That turned on fine and the no video and input menus were fine. Only when you turned on a device plugged into the mainboard(hdmi/component) it would turn into the classic c102 fault. A new 47uf smd cap solved it.