I have a 50 inch plasma PN50B400P3DXZA. Turn on Tv and red led blinks along with clicking. No picture or sound. Power supply appears good. My Y-sus is connected to power supply and the x-sus is connected from the Y-sus. When I unplug the Y sus from the power supply i hear sound. When I connect the Y-sus back up and disconnect the X-sus from the Y-sus no sound. The Y-sus part number is LJ92-01689a/b. I am thinking the fets are bad on the board. Any ideas. Thanks