Panasonic TH-42PX80U - LED Blinks 1 Time

LED blinks 1 time
<Trouble Mode and Defective Board>
Trouble Mode
Communication Error
Defective Board
A, GS
Disconnect GS52 on the SD Card Slot Board (GS board )
(See Figure 1). Plug in the TV and turn it on
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
Replace the GS
board
No Yes
Replace the A
board
8
Figure 1
Is the power
LED still
blinking?