Panasonic Generation Plasma Display Television Technical Manual page 46

Power-On (1)
When the unit is turned on using the power button on the front of the TV, the momentary connection of the
power switch to ground supplies a low to the base of Q5604 (DG board) to turn it on. Q5604 outputs a low to
the key input line (pin 18) of the CPU IC1100 on the A board.
The R/C receiver receives the power on command of the remote control and outputs the IR data to the
amplifier Q2510 of the A board. The data is amplified and output to pin 45 of the MPU, IC1100.
A high from pin 49 of IC1100 enters the base of Q2511 to turn it on. As a result the cathode of D2520A goes
low causing the illumination of the power LED.
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