Acer AL1906 Servicehandleiding - Pagina 45
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Power
SOT-223
U701
+5V
NC/LT1117-18
3
2
VI
VO
4
VO
C701
NC
BL_ADJ(DC)
R31
0V ~ 3.3V
4.7K
0V ~ 5V
4.7K
BL_ADJ
R31
C32
P W M
47
N.C
D C
4K7
1uF
+12V
+12V
4
CN701
C706
C707
GND
+
1
2
GND
0.1uF
3
4
100uF/25V
+12V
5
6
GND
+5V
7
8
+5V
9
10
3,4
+5V
GND
11
12
C710
CONN
C709
+
VCC5V
0.1uF
100uF/25V
R706 NC
Q701
Adj_BACKLIGHT
PMBS3904
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
+3V3
+3V3
C703
C704
+
100uF/25V
NC
C51
R32
R29
R33
Q4
1UF
0
X
X
X
1UF
X
1K
4.7K
MMBT3904
+5V
R708
10K
1/16W
BL_ON
R710
NC
BL_ADJ
+12V
GND
C711
+5V
R712
4.7K
1/16W
GND
0.1uF
Q703
PMBS3904
D704(SSM12L) Vf=0.38V and If=1A.
R701
So when system power on, the
1K
1/16W
system loading is about 400mA
R705 4.7K
(3.3V is about 200mA and 1.8V is
1/16W
about 200mA), So D35 changed
from 1N4148(or BAT42) to
C708
SSM12L(schottky diode).
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
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
+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
NC/0.1uF
NC/10uF/16V
44
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
0.1uF
R720
0
12/21 MODIFY
+5V
+12V
5
R730
R731
0
1/16W
NC
R728
Title
NC/4K7
Size
Document Number
B
Date:
Monday, May 09, 2005
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
+
NC
100uF/25V
0.1uF
1/16W
TSUM16AK
Rev
A
POWER
Sheet
1
of
5