ViewSonic VG1921wm-2, Service Manual

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ViewSonic Corporation
Confidential - Do Not Copy
VG1921wm-2
55
Model
Title
Date Rev:
ViewSonic Corporation
Audio
Layout guide :
1. Tie the I.C. pin 1,2,3,18,19,20 to ground with a
large copper pour (open mask layer)
C701 change to 220uF from 470uF
for svr rise up earlier
Line_R
Line_L
LEFT_
RIGHT_
+14V 5,6
VOL 5
MUTE 5
+14V
+14V
+14V
+14V
+
C713
10uF/
25V
R703 10K
CN701
4
3
2
1
P701
4
2
3
5
1
C711
4700pF
C703
0.
1/
50V
R705
27K
Q701
PMBT3904
1
3
2
U701
TDA_7496L
1 2 3
4
5
6
7 8
9
10
11
12
13
14
15 16
17
18 19 20
Gnd Gnd Gnd
INL
VarOut
_L
Volume
VarOut
_R
N.C.
INR
Svr
Stby
Mute
Gnd
OutR
Vs Vs
OutL
Gnd Gnd Gnd
R709
1K
R712
2K
R704 10K
+
C707 470uF/16V
R702 10K
C712
4700pF
R714 100
+
C702
470uF/
25V
Q703
PMBT3904
1
3
2
+
C705 470uF/16V
R713 5K6
R707
5K6
C704 0.47uF
R706
47K
R711
2K
C709
0.
1/
50V
R710
1K
Q702
PMBT3904
3
1
2
+
C701
220uF/
16V
R708 27K
C706 0.47uF
R701
5K1