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U701
SOT-223
+5V
NC/LT1117-18
3
VI
C701
NC
BL_ADJ(DC)
0V ~ 3.3V
0V ~ 5V
BL_ADJ
P W M
D C
+12V
+12V 4
CN701
C706
C707
GND
1
+
0.1uF
GND
3
100uF/25V
+12V
5
+5V
GND
7
+5V
9
3,4
+5V
GND
11
C710
CONN
C709
+
0.1uF
100uF/25V
R706 NC
Adj_BACKLIGHT
R707
4.7K
1/16W
+3V3
+5V
R714
R716
R717
10K
1/16W
10K
1/16W
NC
R723 51K
R725
Q706
4
on_Panel
4.7K
1/16W
PMBS3904
C718
0.1uF
ViewSonic Corporation
+3V3
2
VO
+3V3
4
VO
C703
C704
+
100uF/25V
NC
R31
C51
R32
R29
R33
Q4
4.7K
1UF
0
X
X
X
4.7K
1UF
X
1K
4.7K
MMBT3904
R31
C32
47
N.C
4K7
1uF
+5V
R708
10K
1/16W
2
BL_ON
R710
NC
4
BL_ADJ
6
+12V
8
GND
C711
10
+5V
R712
4.7K
1/16W
12
GND
0.1uF
Q703
PMBS3904
VCC5V
R701
1K
1/16W
R705 4.7K
1/16W
Q701
C708
PMBS3904
1uF
P.S: The 1N4148 Vf=0.7V~1V can't meet
LDO spec. The BAT42, Vf is OK but the
If=200mA(forward current) can not
meet current spec.
For RSDS and Panel VCC=12V
+3V3
VLCD
VLCD
5
+5V
+3V3
R715
NC
R721
R722
Q704
1/16W
AO3401L
0
1/16W
NC
C715
4
on_Panel_12V
0.1uF
C717
R727
+
10uF/16V
10K
1/16W
55
Confidential - Do Not Copy
VA703b-1_VA703m-1
H1
H2
H3
9
5
9
5
9
5
9
5
9
5
9
5
4
4
4
4
4
4
TP
TP
TP
+5V
R711
10K
1/16W
on_BACKLIGHT
4
3,4
+5V
D704(SSM12L) Vf=0.38V and If=1A.
So when system power on, the
system loading is about 400mA
(3.3V is about 200mA and 1.8V is
about 200mA), So D35 changed
from 1N4148(or BAT42) to
SSM12L(schottky diode).
+5V
+5V
+12V
VLCD_12V
R718
R729
R719
NC/10K
NC/10K
NC/10K
Q705
R724 51K
AO3401L
R726 NC/4K7
C716
Q707
0.1uF
PMBS3904
C720
C719
+
NC/0.1uF
NC/10uF/16V
D701
1N4148
B
Q702
D702
CHT2907
1N4148
C705
1uF/16V
R704
100
1/16W
+5V
PC5V
Recommond to used "Blue" parts circuit
for VCC1.8V if you want to suppoert DDC
3,4
+5V
PC5V
3
function when system power off
R732
R709
+5V
10
1/16W
0
1/16W
D704
D703
TO-263
SMAL140
BAT54C
U702
3
2
VIN
VOUT
4
VOUT
1
ADJ
C713
AIC1084-33PM
NC
0.1uF
R720
0
1/16W
12/21 MODIFY
+5V
+12V
VLCD_12V
5
R730
R731
0
1/16W
NC
R728
NC/4K7
VCTRL
4
R702
51
1/16W
VCC1.8
C702
+
VCC1.8
4
4.7uF/16V
R703
2K
1/16W
VCC3.3
VCC3.3
4
VCC3.3
VCC3.3
4
R713
C712
C714
+
100uF/25V
0.1uF
ViewSonic Corporation
Model
Title
POWER
Date
Rev:
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