Read Panasonic KX-HDV230RU / KX-HDV230RUB Service Manual Supplement online
8
KX-HDV230 Series
4.2.
Circuit Operations
4.2.1.
Main LCD Circuit
LCD data are output from pin C19 of IC101 to LCD module.
LCD contrast is set by electronic control in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 10V).
The driving voltage is observed at pin12(VLCDIN) of CN1.
The lighting of the backlight is controlled by Q403.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin U13) pin and the brightness is changed according to its duty
ratio.
LCD contrast is set by electronic control in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 10V).
The driving voltage is observed at pin12(VLCDIN) of CN1.
The lighting of the backlight is controlled by Q403.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin U13) pin and the brightness is changed according to its duty
ratio.
4.2.2.
Self Label LCD Circuit
LCD data are output from pin C19 of IC101 to LCD module.
LCD contrast is set by electronic control in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 16V).
The driving voltage is observed at pin1(VLCD) of CN2.
The lighting of the backlight is controlled by Q402.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin V13) pin and the brightness is changed according to its duty
ratio.
LCD contrast is set by electronic control in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
(approx. 16V).
The driving voltage is observed at pin1(VLCD) of CN2.
The lighting of the backlight is controlled by Q402.
The PWM (Pulse Width Modulation) signal is output from IC101 (pin V13) pin and the brightness is changed according to its duty
ratio.
MLCD_CS
LCD_DI
LCD_CLK
LCD_DO
MLCD_RST
MLCD_RST
LCD_DO
LCD_DI
LCD_CLK
MLCD_CS
CN1
1
CS0
2
RST
3
CD
4
SCL
5
SI
6
VDD
7
VSS
8
VB0+
9
VB0-
10
VB1-
11
VB1+
12
VLCDIN
R161
R163
R164
R165
C187
DG
R166
C191
C189
C190
3.3V
C188
DG
DG
DG
R162
L106
L107
L103
DG
C106
C105
DG
C108
C109
DG
C110
C192
C193
To Main LCD
D18
D17
C19
D19
G18
IC101
IC101
D420
MLCD_K
MLCD_A
5V
DG
L412
C497
DG
M
_
A
_
D
C
L
M
M
_
K
_
D
C
L
M
Q403
R443
R444
IC101
pin U13
C512
R440
LCD_DO
LCD_DI
LCD_CLK
R163
R164
DG
R162
L106
L107
C105
C108
C109
C192
C193
D18
D17
C19
IC101
IC101
IC101
pin U13
LCD_CLK
LCD_DI
SLCD_RST
SLCD_CS
LCD_DO
SLCD_RST
SLCD_CS
DG
R169
R168
R168
3.3V
C167
DG
CN2
1
1
2
1
3
1
4
1
5
1
6
7
8
9
10
11
12
13
14
15
L102
C163
C161
C162
DG
C160
L105
C104
DG
R126
3.3V
H18
G17
R125
C164
To SelfLabel LCD
5V
C496
L413
DG
DG
M
_
A
_
D
C
L
S
SLCD_K_M
Q402
R441
R442
C511
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