Panasonic LCD-201411 / AVC-201411 / AX900 Service Manual / Other ▷ View online
P
IC7405
( TNPA5936** )
IC7301
1
Start Vcc
15
11
T7301
T7302
Q7301
Q7302
10
Q7303
PC7302
Q7202
L=ON
6
D7104,
7105
R7104-
7105
3
4
PC7301
feedback
2
6
STB5V
PC7303
IC7401
CE
VH
VCC
HO
LO
FB
PGS
(Good)
Q7426-28
Q7401
P3
15
17
16V
P2
SUB-ON
VCC
5V
Standby/ON
Switch
STB
(mode change)
D7102
/03
Rectifier
PFC
IC7201
Q7201
T7201
D7203/09
C7213-7
12
VCC
9 - 12
Q7403/05
Q7422-25
IC7403/04
Q7408/09
IC7402
2
< from to : P board >
3
29
( PFC = ON
AC100V: 380V
AC240V: 380V)
AC240V: 380V)
SRV-16V
SRV-5.3V
(*)The DC level is different by the LCD panel.
Start up Operation (AX900) -6
rectifier
rectifier
SRV-P40-48V
48/40V
1 - 6
13
11
14
14
1- 4
AX900
16V
48/40V
When the power board receives the TV_SUB_ON signal from IC1100 via pin 17 of
connector P2, it outputs 2 different voltages:
16V to the A board (on pins 9-12 of connector P2) ,FR board (on pin 1-4 of
connector P2) and AP board on pin 13 of connector P3).
48/40V to the AP board on pins 1-6 of connector P3.
This command is carried to the primary side by PC7302. It is connected to the Q7202
which provide power supply VCC of PFC circuit. The PFC starts to operate. After
switching on the Q7202, the VCC switch on the Q7303 also. Then the operation of the
IC 7301 changes the switching frequency from standby state to working state and output
voltages rise up.
which provide power supply VCC of PFC circuit. The PFC starts to operate. After
switching on the Q7202, the VCC switch on the Q7303 also. Then the operation of the
IC 7301 changes the switching frequency from standby state to working state and output
voltages rise up.
Output voltages from transformer T7301 start rising up until the moment when IC7401
started to operate. This IC measures the 16V line output in the secondary side. The
output of this IC is provided by PC7301 to pin 4 of IC7301. IC7301 adjust the switching
frequency by this feedback signal.
output of this IC is provided by PC7301 to pin 4 of IC7301. IC7301 adjust the switching
frequency by this feedback signal.
The TV_SUB_ON signal also switches on the Q7403,05,26,28 to provide output
voltages (16V and 48/40V ) to other boards. The 48/40V is provided to AP board ( for
LED Backlight Power Supply ). The 16V is provided to the A board.
LED Backlight Power Supply ). The 16V is provided to the A board.
2
< from to : P board >
3
30
Start up Operation (AX900) -7
AX900
FR
LD
AP
P
A
P2
A02
Q7403/05
9
17
5V
IC5420
IC8101/03
3.3V
IC8950
3.3V
IC5400
1.8V
IC5703
1.8V
0.9V
P
16
V
Q7402
IC8104
SUB1.8V
SUB_M_0.9V/SIB_I_0.9V
SUB3.3V
REG_1.8V
48/40V
LCD_TV_SUB_ON
48V
Output
16V
Output
P
A
2
0
0
0
1.1V
IC5705
DMD 1.1V
D
C
D
C
E
N
SUB5V
PFC
T7201
IC7201
DC/DC
IC7301
P16V
IC5000
ANALOG
ASIC
IC8000
Peaks
Pro5
16V
DC/DC
IC7405
IC7405
STB5V
STB3.3V
31
(*)The DC level is different by the LCD panel.
Start up Operation (AX900) -8
IC1100
Stand-by/
Control
CPU
DC/DC
IC7550
IC7550
/52/54/56
15
7
3.3V
1.5V
1.2V
1.5V
1.2V
1.8V
0.9V
0.9V
STB_I_1.2V
STB_I_1.5V
STB_I_1.8V
STB_I_0.9V
F16V
1-4
9-12
1-4
1-4
FR20
< : A board (SUB voltage) >
3
1-6
AP3
P3
HDMI3.3V
AX900
(TNPA5936**)
Transformer
T7301
T7302
T7302
The 16V(P16V) from the P board via pin1-4 of connector A02 is applied to Analog ASIC
IC5000 and ICs (Voltage regulators) on the A board to generate the SUB-Voltages used for
signal processing operation.
signal processing operation.
: SUB0.9V, 1.8V, 3.3V, 5V and HDMI3.3V, DMD1.1V, REG1.8V
Each voltage regulators start up by high state of DCDCEN signal which is pull up to P16V.
So P16V is provided to A board, each SUB-voltage regulator ICs start output.
So P16V is provided to A board, each SUB-voltage regulator ICs start output.
< : A board (SUB voltage) >
3
32
Start up Operation (AX900) -9
AX900
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