Panasonic TC-P50ST50 - Troubleshooting 12 Blinks Failure

Troubleshooting 12 Blinks Failure
List of boards likely to cause this symptom. Blink
Code
No.1 No.2 No.3 No.4
12
Blinks
A
Speaker/
Subwoofer
Yes
Unplug the TV and remove connector A12 from the A board. Plug in the TV and turn it on
No
Is the TV still
shutting down
with 12 blinks?
Start Here
Disconnect the speakers
one at a time to
determine which one is
bad
Replace the A
board
Slide 29
TC-P50ST50