Led Blinks 1 Time - Panasonic TH-42PX75U Technical Manual

<Trouble Mode and Defective Board>
Trouble Mode
Communication Error
<How to find the defective boards>
The A board is defective.
To confirm this, unplug
the TV and disconnect
connectors A5, A6, and
A7 from the A board.
The TV should turn on
automatically and display
a white screen.
Note: CN = Connector

LED blinks 1 time

Defective Board
A Board
7
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
A5, A6, and A7
location