Panasonic TC-P50S60 Technical Manual page 31

Power On Commands (All ST60 Models + 55", 60", and 65" S60 Models)
The TV can be turned on in 2 different ways:
1. Pressing the power switch on the TV
2. Pressing the power switch on the remote control
Pressing the power switch on the TV
Note: On these models, the power switch is located on the Control Assembly.
When the power switch is pressed, the KEY input line of the microprocessor (IC8000) is grounded.
Pressing the power switch on the remote control
The signal from the remote control is converted to pulses by the remote control receiver on the K
board. The pulses are provided to the microprocessor IC8000.
When either, the KEY input line is grounded or the pulses from the R/C receiver are received
by IC8000, it outputs 2 commands:
1st F_STB_On
2nd Panel_Main_On.
Note: These commands are not output simultaneously. After F_STB_On is output and the
expected voltages are generated without any problems, then Panel_Main_On is output.
TC-P55/60/65S60
TC-P**ST60 (All ST60)
Pressing the power switch to turn on the TV
Slide 31