ViewSonic Va703b3 Service Manual

							
Model
Title
DateRev:
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)
Line_R Line_LR
L
+14V 6,7
VOL
2,4,6
MUTE
2,4,6
+14V
+14V
+14V
C704
0.47/16V
R703 10K
R715 27K
R712 2K
+
C702
470u/25V
R706
47K
C711 4700p/50V
R710 1K
R702 10K
R707 5K6
U701
TDA7496L
12313181920
4
5
6
7
8
9
10
11
12
14
1516
17
GND
GND
GND
GND
GND
GND
GND
INL
VAROUT_L
VOLUME VAROUT_RNC
INR
SVR
STBY
MUTE OUTR
VS VSOUTL
R701 5K1
Q702
PMBT39041
3
2
+
C701 220u/16V
R704
10K
+
C707
470u/16V
R708
22K
Q703
PMBT3904
1
3
2
C703
0.1/50V
Q701
PMBT39041
3
2
R714 100
C709 0.1/50V
R711 2K
P701
AUDIO IN
2
3
4
5
1
C712 4700p/50V
C706
0.47/16V
+
C713 10u/25V
R709 1K
+
C705
470u/16V
R713 5K6
CN701
4P R/A 2.0mm
1 2 3 4
 58 
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  Confidential - Do Not Copy  VA703b-3_VA703m-3  
						

							
Model
Title
DateRev:
ViewSonic Corporation
Power Supply
NL
TO SCALER BD CN101
1000u/25V
TOP245Y
C808 1000u/25VTOP246Y Q7b
VA703
IC802
ItemVA703m
680u/25V TOP246Y
100u/450V
C805 100u/450V
82u/450V
90mm 8P
80mm 9P
CN801 80mm 9P
12K
R817 12K
8K2
R801 3M3
2M4 3M3
2M4 3M3
R822 3M3
2M4 3M3
R823 3M3
2M4 3M3
R805 3M3
PGND
VCC5V
+14V
ON/OFF 2,7BRIGHTNESS 2,4,7
VOL
2,4,5MUTE 2,4,5
R821
1M
L802
5uH
R807
510K
R818
3K3 1%
C819
47u/25V
R809
100 1%
D819
1N4148
ZD803
NC/5V6ZD804
NC/16V
R808
10K
C812
1000u/10V
R812
6R8R816
6R8
C820
2200p/400V
C806
2200p/250V
T801
SPW-051
1
2
3
5
4
11
6
7
9
10
8
C802
1000p/500V
-+
D801
BL4-06
1
2
4
3
C817
0.1/50V
C824
4700p/400V
+C805
100u/450V
R814
1K
R817
12K 1%C813
47p/1KV
IC803
TL431
3
1
2
R822
3M3
ZD801
9V1
D805 SRF5-04CT
123
D803 SRF8-10CT
123
C801
2200p/250V
IC801
LTV817M
3
14
2
L803
5uH
C821
0.1/50V
C814
47u/25V
R819
10K/NC
R810
5K1 1%
RT801
NTC 5R
C803
4700p/1KV
D804
MUR1100ERL
ZD805
12V
C816
0.1/100V
C808
1000u/25V
CN801
80mm 9P
1
2
3
4
5
6
7
8
9
C810
470u/25V
R811
51K 1%
F801
2A/250V
IC802
TOP246YN1
2
345
6
C
L
X S
F D
R820
1M
B801
Bead_Jumper
R813
1K/NC
D806
A02-LF
R823
3M3
P801 AC_SKT
123
R804
68
R826
470K
R805
3M3
C804
0.47/275V
Q802
2SC1815
1
3
2
R828
100 1W
Q801
NC/PMBT39041
3
2
R801
3M3
C815
47u/25V
R803
510K
C811
1000p/500V
ZD806
NC/9V1
ZD802
P6KE200A-LF
C823
0.1/50V/NC
C822
0.1/50V
C818
47u/25V
R829
200R806
10
L801
12mH
41
32
R802
10
R827 10K
R815
1K
R824
510K
VCC5V 7
 59 
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  Confidential - Do Not Copy  VA703b-3_VA703m-3  
						

							
Model
Title
DateRev:
ViewSonic Corporation
Inverter
+5V
+5V
ISEN2 ISEN1 +5V
ISEN1
ISEN3
+5V
ISEN3 OVP2 OVP1ISEN2
OVP2 OVP1
ON/OFF
2,6
+14V
BRIGHTNESS
2,4,6
VCC5V
6
CN501
4100-D021
2 H
L
C513
1000p/50V
C502
1000p/50V
R509
470 1%
C507
2.2u/25V
R523
33K 1%
C511
2.2u/25V
R511 0
R521
33
D507
BAV99
1
3
2
R514
100K
R526
10K
C510
0.068/50V
R529
1M
IC501
OZ9938GN
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
DRV1
VDDA
TIMER
DIM
ISSEN
VSEN
OVPT
NC NC ENALCT
SSTCMP CT
GNDA DRV2
PGND
D505
BAW56
32
1
D506
BAW56
32
1
D503
BAV99
1
3
2
C532
0.068/50V
R522
43K 1%
C515
NC
R507
NC
R536
470 1%
R512
10K
C504
1000p/50V
C524
10p/3KV
R506
33
C516
0.033/50V
R528
NC
R501
3M 3KV
R533
33
D502
BAV99
1
3
2
R517
3K3 1%
CN502
4100-D021
2 H
L
CN504
4100-D021
2 H
L
T501
SPW-068
1
3
4
6
8
7
R520
3K3 1%
C530
6800p/50V
ZD501 NC
R508
33
R510 0
U501
AP9971GD
6
54
3
7
81
2
R524
22K 1%
R534
2K 1%
C531 220p/50V
U502
AP9971GD
6
54
3
7
81
2
+C522
150u/35V
+C509
150u/35V
D508
BAV99
1
3
2
C523
6800p/50V
R537
470 1%
C503
NC
R527
3M3 1%
C525
5p/3KV
R538
604K 1%
D504
BAV99
1
3
2
R530
1M
C514
1000p/50V
C529 220p/50V
Q501
NC/PMBT39041
3
2
C506
4700p/50V
D501
BAV991
3
2
R513
1M
R503
3M 3KV
C501
1000p/50V
C512
0.033/50V
C527
5p/3KV
R535
1K
C526
10p/3KV
C535
470p/50V 
T502
SPW-068
1
3
4
6
8
7
C508 0.022/50V
C536
470p/50V 
C505
0.01/50V
R531
NC
CN503
4100-D02
1
2 H
L
R532
33
 60 
ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3  
						

							
Model
Title
DateRev:
ViewSonic Corporation
Keypad
AUTOUP
MENU DOWN
POWER
DOWN GND
POWER LED_G
UP AUTO MENU LED_O
SW905
SW_TACT
1
32 4
CN901
8P R/A 2.0mm
1
2
3
4
5
6
7
8
SW904
SW_TACT
132 4
SW903
SW_TACT
132 4
LED901
LED G/Y
3
2
1
SW902
SW_TACT
132 4
SW901
SW_TACT
1 32 4
 61 
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ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3 
11. PCB Layout Diagrams 
 
  
						

							
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ViewSonic Corporation
  Confidential - Do Not Copy  VA703b-3_VA703m-3 
* Reader’s Response* 
Dear Readers: 
 
Thank you in advance for your feedback on our Servic e Manual, which allows continuous improvement 
of our products. We would appreciate your completion  of the Assessment Matrix below, for return to 
ViewSonic Corporation. 
Assessment
 
A.  What do you think about the cont ent of this Service Manual? 
Unit ExcellentGood Fair Bad 
1. Precautions and Safety Notices     
2. Specification     
3. Front Panel Function Control Description     
4. Circuit Description     
5. Adjustment Procedure     
6. Troubleshooting Flow Chart     
7. Recommended Spare Parts List     
8. Exploded Diagram and Exploded Parts List     
9. Block Diagrams     
10. Schematic Diagrams     
11.PCB Layout Diagrams     
 
B. Are you satisfied with this Service Manual? 
Item Excellent Good Fair Bad 
1. Service Manual Content             
2. Service Manual Layout            
3. The form and listing            
 
C.  Do you have any other opinions or sugge stions regarding this service manual? 
 
Reader’s basic dada:
 
Name:   
Title:  
Company:  
Add:  
Tel:   
Fax:  
E-mail:  
After completing this form, please return it to ViewSonic Quality Assurance in the USA at facsimile 
1-909-839-7943. You may also e-mail any suggestions to the Director, Quality Systems & Processes 
([email protected])