Panasonic LCD-201411 / AVC-201411 / AX900 Service Manual / Other ▷ View online
When the TV is plugged in, the rectifier start to produce DC voltage which leads
through PFC circuit directly to the power switches Q7301, Q7302. (PFC circuit
IC7201 does not operate at this moment.) Besides this DC voltage is provided also for
D7104, D7105 which provide start voltage to pin 1 of power supply IC 7301. When
the voltage on pin 1 rise up to predefined value IC7301 starts supplyinng of switching
pulses for Q7301, Q7302. Due to this current starts to lead through winding of T7301/
T7302 which starts to generate output voltages. One of these voltages VCC is used
for power supplying of the IC 7301 to its pin 10.
IC7201 does not operate at this moment.) Besides this DC voltage is provided also for
D7104, D7105 which provide start voltage to pin 1 of power supply IC 7301. When
the voltage on pin 1 rise up to predefined value IC7301 starts supplyinng of switching
pulses for Q7301, Q7302. Due to this current starts to lead through winding of T7301/
T7302 which starts to generate output voltages. One of these voltages VCC is used
for power supplying of the IC 7301 to its pin 10.
When the power supply starts up, the 16V is providing by IC7402 and Q7408,09.
This voltage leads to IC7405, which is 5 volts DCDC converter. This converter needs
to get starts commands, which is provides by IC 7301 pin 3. This pin is internaly
grounded in normal state and the information is carried to the secondary side by
PC7303. Finally there is input signal on pin 6 of IC7405 for start its operation.
to get starts commands, which is provides by IC 7301 pin 3. This pin is internaly
grounded in normal state and the information is carried to the secondary side by
PC7303. Finally there is input signal on pin 6 of IC7405 for start its operation.
This voltage (STB5V) is provided to A board via connector P2 pin15. So if the TV is
plugged in, STB5V is provided to A board without trigger signal.
< from AC plug in to
: P board >
1
25
Start up Operation (AX900) -3
AX900
P
A
P2
A02
5VS
STB5V
IC1100
Stand-by/
Control
CPU
IC5000
STB3.3V
K
A10
K10
REMOTE
LED
8
5
KEY3
3.3V
7
15
3.3V
17
9
LCD_TV_SUB_ON
IC7405
4
1
LED_on
OFF
(It can receive only Power SW)
(It can receive only Power SW)
Standby
(It can receive Power SW, Remote, Viera Link and so on)
(It can receive Power SW, Remote, Viera Link and so on)
North America
Power LED: OFF
Except North America
Power LED: OFF
Power LED: RED
Power SW on
2
< from to : A board >
1
GK
P5
3
POWER
Switch
12
20
( Automatically )
26
Start up Operation (AX900) -4
IC8000
Peaks
Pro5
3.3V/1.8V/1.5V
/1.2V/0.9V
STB_I_**V
The stand-by CPU(IC1100) is separated from Main Soc of AX900/AX850/X940 model.
AX900
The STB5V from pin15 of connector P2 is applied to the Analog ASIC (IC5000) for
supplying power to the Stand-by CPU(IC1100) on the A board. The Analog ASIC (IC5000)
converts the STB5V to STB3.3V. This voltage energize and prepare the microprocessor
(CPU) for program execution. The STB3.3V from the Analog ASIC (IC5000) is also applied
to the remote control receiver and the power LED on the K board through pins 5 of
connector A10/K10.
converts the STB5V to STB3.3V. This voltage energize and prepare the microprocessor
(CPU) for program execution. The STB3.3V from the Analog ASIC (IC5000) is also applied
to the remote control receiver and the power LED on the K board through pins 5 of
connector A10/K10.
When the Power Switch on, the key3 signal is grounded. (#1)
The IC1100 lights on the RED LED and is ready to power on the TV by receiving the Power
switch on, Remote on, Viera Link and so on. This is a standby state.
switch on, Remote on, Viera Link and so on. This is a standby state.
(#1)Only North America model:
Power switch on is no need, automatically this procedure is
operated after the TV is plugged in. But the RED LED does
not light.
When the power on command from the power switch, the remote control and so on is
provided to IC1100, IC1100 first outputs the “TV_SUB_ON” command. The “TV_SUB_ON”
command is provided to power board via pin 9 of connector A2.
command is provided to power board via pin 9 of connector A2.
(#)
Just after transition to Stand-by mode, the TV_SUB_ON(16V) output for few minutes.
(North America model : 10s)
2
< from to : A board >
1
27
Start up Operation (AX900) -5
AX900
Power On
LED: Green
Stand-by
LED: Red
Power Off
LED: OFF
AC Off
Plug
Out
Plug
In
Plug
Out
Plug
In
Plug
Out
Plug
In
Remote
Pow-SW
(Reference : State Transition Diagram)
Power On
LED: Red
Stand-by
LED: OFF
AC Off
Plug
Out
Plug
In
Plug
Out
Plug
In
Pow-SW /
Remote
< Except north America >
< North America >
Pow-SW
28
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