Black screen, 14-blink error code
2011 Panasonic TC-P42ST30 screen went black, no audio, no image. LED light steady on. When power is cycled off and on, LED light gives 14-blinks.
Replaced power board with replacement #1; this resulted in no change.
Replaced power board again with replacement #2; this resulted in no change.
Replaced A-board, tried with both original and replacement power board; this again resulted in no change.
Any ideas are appreciated.