you may have to replace (at least) one of the boards and perhaps the power supply ;(. I would spec out a replacement for both just to get a sense of what it would cost vs buying a new one. It's a shame that these quickly become disposable units ;(.
Take a peek at the ifixit.com pages for your model just in case you need another reference point for a possible repair.
I have a Sanyo Plasma HDTV model Number: DP50747 Chassis Number: P50747-03 While playing a video game on HDMI channel I heard a pop and the screen went black but there was still sound going through the device and the back lighting was still on. Opened the chassis to check fuses all 7 are good with a multi-meter, but I found 1 capacitor blown on the Y board. Replaced the capacitor but the screen is gray with a black line on the bottom of screen and has no functionality through remote or manual inputs. clicking from power supply that I have never heard before ( believe they are electronic switches) Any help or feedback would be appreciated.