I have a Panasonic 42" plasma TH42PZ77U that I bought in 2007. In 2009 I had the SC Board replaced under warranty when I lost the picture and sound and the LED blinked 7 times. The same thing happened again this month. Assuming the SC Board was again the problem, I pulled it (since the warranty has expired) and had it refurbished. I just reinstalled the refurbished board and while the set still won't turn on, the LED now blinks 10 times instead of 7. I read online that the 10 blinks may be due to a bad power supply board. Before I pull it, is there a way to test it without taking it out of the TV? Has anyone else had this same problem with the LED going from 7 to 10 blinks? Thanks.