Panasonic TC-P42X1 Revised Troubleshooting Handbook page 48

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.
Replace the SU
7 Blinks Error Code (3 of 4)
Follow the SU/SD boards isolation
procedure shown on slides 18, 19, and
20. Plug in the TV and press the power
No
and the SD
boards.
A
Start Here
switch
Yes
Does the
TV shut down
and the power
LED
blink 7 times?
Replace the
SU, SD, and
SC boards
Slide #48