AOC 197Va, Service Manual

Page: 16 / 47

19" LCD Color Monitor AOC 197Va
16
GND
R711
10K 1/16W
PC5V 3
P W M
C701
NC
R724 51K
Q705
AO3401L
+
C710
100uF/25V
VCTRL 4
VCC3.3 4
+12V
R708
10K 1/16W
C32
X
+12V
R705 4.7K 1/16W
+ C702
4.7uF/16V
Recommond to used "Blue" parts circuit
for VCC1.8V if you want to suppoert DDC
function when system power off
+5V
+5V
+12V
R709
0 1/16W
0 1UF
R717
10K 1/16W
1uF
R701
1K 1/16W
VLCD_12V 5
N.C
12/21 MODIFY
CN701
CONN
2
4
6
8
10
12
1
3
5
7
9
11
R715
NC
C713
0.1uF
+5V 3,4 on_BACKLIGHT 4
C706
0.1uF
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.
VLCD 5
R29
R720 0 1/16W
+5V
TSUM16AK
R723 51K 1/16W
R728
NC/4K7
R727
10K 1/16W
Q704
AO3401L
R32
SOT-223
0V ~ 3.3V 4.7K
R704
100 1/16W
+
C712
100uF/25V
+5V
+3V3
+5V
Q706
PMBS3904
R729
NC/10K
U701
NC/LT1117-18
3 2
1
4
VI VO
GND
VO
For RSDS and Panel VCC=12V
D704
SMAL140
+12V 4
47
VCC5V
R714
10K 1/16W
+5V
GND
MMBT3904
R726 NC/4K7
+12V
+3V3
R707
4.7K 1/16W
C51
4K7 D C
+5V
R703
2K 1/16W
4.7K
C716
0.1uF
+5V
R710 NC
on_Panel 4
R31
C708
1uF
R716
NC
Q701
PMBS3904
R31
GND
+5V 3,4
+5V
GND
H3
TP
1 2 3
4
5
6 7 8
9
1 2 34
56
7 8
9
+
C719
NC/10uF/16V
VCC1.8 4
VLCD
C718
0.1uF
R721
0 1/16W
H2
TP
1 2 3
4
5
6 7 8
9
1 2 34
56
7 8
9
R33
R722
NC
R731
NC
X
R730
0 1/16W
BL_ADJ
H1
TP
1 2 3
4
5
6 7 8
9
1 2 34
56
7 8
9
Q703
PMBS3904
Q4
VCC1.8
R713
NC
on_Panel_12V 4
+3V3
+12V
+
C705
1uF/16V
PC5V
X
C704
NC
X
D703
BAT54C
3
1 2
Adj_BACKLIGHT
4
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).
VLCD_12V
+
C703
100uF/25V
C715
0.1uF
Q702
CHT2907
C
B
E
VCC3.3
BL_ON
GND
Q707
PMBS3904
+3V3
+3V3
0V ~ 5V
R712 4.7K 1/16W
C720
NC/0.1uF
D702
1N4148
BL_ADJ(DC)
D701
1N4148
R718
NC/10K
R719
NC/10K
C714
0.1uF
1K
POWER A B
1 5 Monday, May 09, 2005
Title
Size Document Number Rev
Date: Sheet of
+5V
VCC3.3
C711
0.1uF
+5V
GND
R732
10 1/16W
U702
AIC1084-33PM
3
1
2
4
VIN
ADJ
VOUT
VOUT
R706 NC
C709
0.1uF
+5V 3,4
BL_ADJ
R702
51 1/16W
1UF
TO-263
VCC3.3 4
+5V
+
C707
100uF/25V
4.7K
+5V
R725
4.7K 1/16W
+
C717
10uF/16V