Panasonic TC-P42X1 Revised Troubleshooting Handbook page 63

If the power LED continues to blink even after the TV is unplugged, press and hold the power
switch on the TV for a few seconds until the LED turns off.
Trouble Mode
Communication Error between
IC8001 and IC1100
13 Blinks Error Code
Defective Board (Possibility)
A Board
Replace the A board
Warning: Disconnect AC Power prior to making any
disconnection or connection
Slide #63