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10. Schematic Diagrams
+5V
C701
NC
+12V
C706
C707
+
0.1uF
100uF/25V
+5V
3,4
+5V
C710
C709
+
0.1uF
100uF/25V
Adj_BACKLIGHT
+3V3
R716
R717
10K
10K
1/16W
NC
R725
4
on_Panel
4.7K
1/16W
C718
0.1uF
ViewSonic Corporation
SOT-223
U701
+3V3
NC/LT1117-18
3
2
VI
VO
+3V3
4
VO
C703
C704
+
100uF/25V
NC
BL_ADJ(DC)
R31
C51
R32
R29
R33
Q4
0V ~ 3.3V
4.7K
1UF
0
X
X
X
0V ~ 5V
4.7K
1UF
X
1K
4.7K
MMBT3904
BL_ADJ
R31
C32
P W M
47
N.C
D C
4K7
1uF
+5V
R708
+12V
4
CN701
10K
1/16W
GND
1
2
BL_ON
R710
NC
GND
3
4
BL_ADJ
+12V
5
6
+12V
GND
GND
7
8
C711
+5V
+5V
9
10
R712
4.7K
GND
11
12
GND
0.1uF
Q703
PMBS3904
CONN
VCC5V
R701
1K
1/16W
R706 NC
R705 4.7K
1/16W
Q701
C708
PMBS3904
1uF
R707
4.7K
1/16W
For RSDS and Panel VCC=12V
+3V3
+5V
VLCD
VLCD
5
+5V
+3V3
R714
R715
1/16W
NC
R721
R722
Q704
R723 51K
1/16W
AO3401L
0
1 / 16W
NC
Q706
C715
4
on_Panel_12V
PMBS3904
0.1uF
C717
R727
+
10uF/16V
10K
1/16W
Confidential - Do Not Copy
65
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
1/16W
on_BACKLIGHT 4
3,4
+5V
3,4
+5V
D704(SSM12L) Vf=0.38V and If=1A.
D704
So when system power on, the
SMAL140
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).
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.
+5V
+5V
+12V
VLCD_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
R728
+
NC/0.1uF
NC/10uF/16V
NC/4K7
VG720-1
VCTRL
R702
51
1/16W
VCC1.8
C702
+
4.7uF/16V
D701
1N4148
B
R703
Q702
2K
1/16W
D702
CHT2907
1N4148
C705
1uF/16V
R704
100
1/16W
VCC3.3
+5V
PC5V
Recommond to used "Blue" parts circuit
for VCC1.8V if you want to suppoert DDC
PC5V 3
function when system power off
R732
R709
+5V
10
1/16W
0
1 / 16W
D703
TO-263
BAT54C
U702
3
2
VIN
VOUT
4
VOUT
1
ADJ
R713
C712
C713
AIC1084-33PM
C714
+
NC
0.1uF
100uF/25V
0.1uF
R720
0
1/16W
12/21 MODIFY
+5V
+12V
5
R730
R731
0
1/16W
NC
ViewSonic Corporation
Model
Title
Date
4
VCC1.8
4
VCC3.3
4
VCC3.3
VCC3.3
4
POWER
Rev:
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