Service manual

61
ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2
Model
Title
Date Rev:
ViewSonic Corporation
TDA7496L
Layout guide :
1. Tie the I.C. pin 1,2,3,18,19,20 to ground with a
large copper pour (open mask layer)
R
L
Line_R
Line_L
VOL2
+14V 2,3
MUTE2
+14V
+14V
+14V
+14V
R711 2K C711 4700p/50V
+
C707
470u/16V
U701
TDA7496L
1 2 3 13 18 19 20
4
5
6
7
8
9
10
11
12
14
15 16
17
GND GND GND GND GND GND GND
INL
VAROUT_L
VOLUME
VAROUT_R
NC
INR
SVR
STBY
MUTE
OUTR
VS VS
OUTL
R715 27K
R704
10K
Q703
PMBT3904
1
32
+
C713 10u/25V
C704
0.47/16V
+
C705
470u/16V
R712
2K
C712 4700p/50V
R714 100
P701
AUDIO IN
2
3
4
5
1
C709 0.1/50V
R713 5K6
R706
47K
R701 5K1 R707 5K6
R710 1K
+
C701 220u/16V
C706
0.47/16V
+
C702
470u/25V
Q701
PMBT3904
1
32
C703
0.1/50V
Q702
PMBT3904
1
32
CN701
4P R/A 2.0mm
1
2
3
4
R702 10K
R709 1K
R703 10K
R708
27K