Panasonic TH-65PX600U Service Manual page 32

Panel-Standby-On Circuit
When the TV is off, a low registered at pin 5 of IC1103 keeps Q1101 off. Consequently
Q1139 conducts, keeping the voltage at pin 30 of connector DG3 low.
When the power is turned on, pin 5 of IC1103 goes high (3.2V) and Q1101 outputs a low to
the base of Q1139 to turn it off. As a result, pin 30 of connector DG3 goes high. (Pin 30 is
normally kept high by a pull-up resistor connected to the STB5V on the D board.)
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