Panasonic Generation Plasma Display Television Technical Manual page 27

STB5V (3)
The STB5V source is connected to the voltage input (pin 4) of the RESET/STB3.3V regulator IC9011.
The output of this IC is controlled by the ON/OFF pin (Pin 6). The DC level of this pin is determined by the
"STB3.3V ON/OFF" circuit.
During standby pin 6 of IC9011 is low keeping IC9011 off. When the power is turned on; pin 6 goes high, the
IC turns on and outputs 3.3V on pin 3.
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