Main Board Power Supply - Acer AL1916 Service Manual

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
+5V GND 7 8
+5V 9 10
3,4 +5V
GND 11 12
C710 CONN
C709
+
VCC5V
0.1uF 100uF/25V
R701
R706 NC
Q701
Adj_BACKLIGHT
PMBS3904
R707
4.7K 1/16W
+3V3 +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.
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
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
POWER A
Sheet 1 of 5