Sos Detect (Shutdown) - Panasonic TC-P42X1 Technical Manual

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SOS Detect
(Shutdown)
When an abnormality occurs in the unit, the "SOS Detect" circuit is triggered and the TV shuts down.
The power LED on the front panel will flash a pattern indicating the circuit that has failed.
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.