Panasonic TH-42PX75U - LED Blinks 3 Times

LED blinks 3 times
<Trouble Mode and Defective Board>
Trouble Mode
3.3V down SOS
Defective Board
D Board
<How to find the defective boards>
The D board is defective.
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
9
Note: CN = Connector