Panasonic TC-L42D2 Technical Manual page 59

iPod SOS Circuit _ No Blink Code
The normal state of the iPod SOS input to IC8001 is low. This is achieved by applying the 5V output of
IC3201 to the base of transistor Q3208. If the 5V source is missing or shorted, the transistor Q3208
turns off and its collector goes high to alert IC8001. The MPU within IC8001 turns off IC3201 and provides
the "Check iPod Connection" warning on the screen. To restore normal operation:
1. Turn off the TV
2. Unplug it from the AC outlet
3. Disconnect the iPod
4. Restore power to the unit _ Normal operation should be restored
Slide # 59