Panasonic TH-65PX600U Service Manual page 19

This block diagram shows the sequence of events that takes place inside the TV during
standby.
When the TV is plugged in:
1. AC is applied to the power supply board (P) through connector P9. The AC is applied to
the standby circuit to produce STB12V and STB5V. The STB12V is only used to turn
on a circuit whose function is to allow the output of the STB5V through connector P25.
2. The STB5V passes through the D board via the connectors D25 and D3 and enters the
DG, the H, and the PA boards. The STB5V is applied to a 3.3V and a 1.5V regulator
circuit to power the Main CPU (IC1103) on the DG board.
3. When IC1103 receives 3.3V and 1.5V, it outputs a command that is provided to both the
P and the PA board. This command only lasts approximately 15 seconds. The command
applied to the P board is called "F-STB-ON" and it is routed through the D board via
connectors D3 and D5. The function of this command is to turn on the circuit that
generates the "F-STB-14V" in the P board.
4. The command applied to the PA board through connector PA20 is called "TUNER-
SUB-ON". The function of this command along with the STB5V from connector PA40,
is activate the "SOS DETECT" circuit in the PA board.
5. The F-STB14V from connector P10 on the P board is applied to the PA board through
connector PA10. This voltage is applied to a regulator circuit that generates: SUB9V,
SUB5V, and SUB3.V.
Standby Block Part1
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