Panasonic TC-L42D2 Technical Manual page 60

9 Blinks SOS Circuit
On the A board, the MPU (IC8001) monitors the operation of the audio power amplifier IC2106.
If IC2106 or one of the speakers develops a short circuit, a high is output to IC8001 to trigger a
shutdown and 9 blinks of the power LED. When a 9 blinks shutdown occurs, disconnect the
speakers one at a time and turn the unit on. If the problem remains, replace the A board. If it
goes away, the disconnected speaker is the problem.
Slide # 60