Acer AL1906 Service Manual - Page 45
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Power
U701
+5V
NC/LT1117-18
3
C701
NC
BL_ADJ(DC)
0V ~ 3.3V
0V ~ 5V
BL_ADJ
P W M
D C
+12V
+12V 4
C706
C707
GND
+
GND
0.1uF
100uF/25V
+12V
GND
+5V
+5V
3,4
+5V
GND
11
C710
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
R725
4
on_Panel
4.7K
1/16W
C718
0.1uF
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SOT-223
2
VI
VO
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
CN701
10K
1
2
BL_ON
3
4
BL_ADJ
5
6
+12V
7
8
GND
C711
9
10
+5V
12
GND
0.1uF
CONN
VCC5V
R701
1K
1/16W
R705 4.7K
1/16W
Q701
C708
PMBS3904
1uF
+3V3
VLCD
VLCD
+5V
R715
NC
Q704
R723 51K
1/16W
AO3401L
Q706
C715
PMBS3904
0.1uF
C717
+
10uF/16V
+3V3
H1
+3V3
9
9
5
4
+5V
1/16W
R710
NC
R711
10K
1/16W
R712
4.7K
1/16W
Q703
PMBS3904
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).
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
+5V
5
+3V3
R718
R721
R722
NC/10K
0
1/16W
NC
R726 NC/4K7
4
on_Panel_12V
R727
10K
1/16W
H2
H3
5
9
5
9
5
9
5
9
5
4
4
4
4
4
TP
TP
TP
on_BACKLIGHT
4
3,4
+5V
+5V
+12V
VLCD_12V
R729
R719
NC/10K
NC/10K
Q705
R724 51K
AO3401L
C716
Q707
0.1uF
PMBS3904
C720
C719
+
NC/0.1uF
NC/10uF/16V
44
C705
1uF/16V
+5V
PC5V
3,4
+5V
R732
R709
+5V
10
1/16W
0
1/1
D704
D70
SMAL140
BAT
C713
0.1uF
+5V
+12V
VLCD_12V
5
R730
R731
0
1/16W
NC
R728
NC/4K7