Panasonic TH-65PX600U Service Manual page 31

Power On
When the CPU on the DG board IC1103 receives the power on command from either the
power switch on the TV panel or the remote control, both pin 5 and pin 215 go high (3.2V).
The 3.2V from pin 215 is provided to the PA board through connector DG20. It is used to
turn on the circuit that generates the "MAIN" voltages on the PA board.
The 3.2V from pin 5 of IC1103 turns on Q1101. When Q1101 conducts, a low is applied to
the base of Q1139 turning it off. When Q1139 is off, pin 30 of connector DG3 goes high
(Pin 30 is kept high by a pull-up resistor connected to the STB5V on the D board).
The "PANEL STB ON" high from pin 30 of connector D3 is applied to the base of Q9044
on the D board, turning it on. Q9044 outputs a low to turn off Q9046 allowing pin 6 of the
STB3.3V Regulator and Reset IC IC9011 to go high. When pin 6 goes high, IC9011 outputs
the reset command at pin 1 and the STB3.3V at pin 3.
The STB3.3V is applied to the VCC pins of the CPU IC9003 (pins 13, 77, and 78). The
CPU then outputs a high (3.2V) at pin 24. The 3.2V is directed to the power supply via pin
17 of connector D25/P25.
At the same time pin 5 (Ready – Status) of IC9003, also goes high (3.2). This voltage is used
to provide the power status information of IC9003 to the CPU on the DG board IC1103. The
"Ready – Status" enters pin 4 of the CPU via pin 34 of connector D3/DG3.
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