Panasonic Plasma 3 blink code???

I have a Panosonic plasma th42px6u and I the TV will not turn on.  When I try to turn on TV the red led light blinks 3 times and the TV does not power up. A repair man said that the power supply board was bad so I replaced it (TNPA 3911) and it still doesn't work. I looked around on the Internet and found a supposed blink code chart that said that 3 blinks means-3.3v SOS - D-board problem.  Since the repair guy had me replace the power supply board and that didn't work and before I go buying any additional parts I wanted to ask if anyone knows what these 3 blinks means and what part should I be replacing to repair this TV correctly? Thanks