Panasonic Generation Plasma Display Television Technical Manual page 50

Power On (Summary)
When the power is turned on, the "PANEL MAIN ON" command and the "F STB ON" command are applied to the
power MCU (IC501). The complete standby operation is repeated when the "F STB ON" command from the A
board is applied to pin 23. When the (3.2V) "PANEL MAIN ON" command from the D board is applied to pin 24 of
IC501, pin 10 goes high and pin 14 goes low. The high from pin 10 turns on the 15V DC-DC converter (Q555) to
output the P15V. When pin 14 goes low, the Vsus switching circuit is turned on to allow for Vsus and Vda to be
output.
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