ViewSonic Va1903wb2 Service Manual

 
- 71 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11 . 2   P o w e r  
 
LD1117S33
SOT-223
715G2467-A for VA1903WM
A
Power
B
25 W ednes day ,  N ov em ber 29,  2006 Tit le
Size Document Number Rev
D at e: Sheet
of
C713
NC/1uF
R704
10K 1/ 16W
R711
51K  1/16W　
N.C
R717
NC/4K7 1/16W
+5V
G2467-B-X-X-1-20061124
C707
C705
0. 1uF /16V
Q705
NC /PMBS3904
The Current of VCC3.3 (
without support 1.8V) is 
arround...

 
- 72 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.3   Input 
 
715G2467-A for VA1903WM
A
INPUT
B
35 Wednesday , N ov ember 29, 2006 Ti t l e
Size Document Number Rev
D at e: Sheet
of
FB402
0R05 1/10W
C 413
0.22uF
C412
220pF
PC5V
R 410 470R  1/ 16W
DDCA_SDA 4
ZD403
UDZS5.6B12
BLUE-
R 404
56Ω 1% 1/16W
SCL_VGA
ZD402
UDZS5.6B
12
RED+
ZD405
UD ZS5.6B12
R418
10K 1/ 16W
R416 1K 1/16W
RIN 4
VGA_CON
D 401
BAV9931...

 
- 73 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.4   Scaler
 
VDDC
C 435
0. 047uF
R 514 10K 1/ 16W
R475
10K 1/ 16W
R469
10K 1/ 16W
PA[ 0. . 9]
VCC3.3 2
R 466
240  1/ 16W　
VCC1.8 2
715G2467-A for VA1903WM
A
SCALER
C
45 W ednes day ,  N ov em ber 29,  2006 Ti t l e
Size D oc um ent  N um ber R ev
D at e: Sheet
of
D 415
BAV99
3
12
VCC3.3
C431
0. 047uFC442
0. 047uF
+12V 2
R 485
1K 1/ 16W
Q408
2N 7002E
The...

 
- 74 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.5 Panel Interface 
RXO2+ RXO0-
PB7
715G2467-A for VA1903WM
A
PANEL INTERFACE
A
55 F riday ,  N ov ember 24,  2006 Ti t l e
Size D oc ument  N um ber R ev
D at e: Sheet
of LVA2M
LVAC KP
RXE2+LVB0M LVB0P
RXO1-
PB[ 0. . 9]
LVB3PLVA3M
PB5LVB3M
RXOC-
LVA0M
RXE3- LVB1M
LVAC KM
LVA1MLVA2P LVA3P
LVA1P
LVB2M
PA7
VLC D 2
RXO3-
LVB1MRXE0+
PA2
PA3 PA0
LVA3P
LVB2P...

 
- 75 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11 . 6    I n v e r t e r
 
R847
1M 1/ 8W
C 829
0. 1uF
D813
1N 4148W
R848
1M 1/ 8W
C 809
0. 047uF
R825
0Ω 1/ 8W
I C 801
OZ 9938GN12345678
910111213141516
DRV1
VDDA
TI MER
DIM
I SEN
VSEN
OVPT
NC1 NC2ENALC T SSTC MPCT GNDADRV2 PGN D
R804
10K 1/ 8W
R802
300KΩ 1/ 8W
DIM
R 820 N C
D802 BAV99
3
12
D810
1N 4148W
C844
0.1uF
D812
1N 4148W
ON /OF F
OPT3
R846
1M 1/ 8W...

 
- 76 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.7  A-D Power 
IC902
TC ET1103G12
43
+C907
NC
ON /OF F
IC903
H431BA
R913
100KΩ 1% 1/ 8W
+12V
R926
1K 1/ 8W
+C904
470U F / 25V
tNR901
NTCR
C919
0.1uF
IC901
LD 7575PS1234
5678
RT
COMP
CS
GNDOUTVC CNCHV
C909
220pF
+12V
C917
0. 1uF
C934
JUMP
Over current protection
R932
0Ω 1/4W
FB901
BEAD12
-
+BD 901
GBU 408
2
1
3
4
D902
FR103
+12V
T90 1
POW ER  XFMR
6
8
5421...

 
- 77 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.8  Audio  
+C 201
470uF / 25V
+C 209
1uF / 50V
VOLUME
C213
0. 1uF
+C 207
470uF / 16V
C N 201
PH ON EJ AC K
15243
R21120K  1/ 10W　
+
C210
10uF / 25V
+12V
GN D
R 202
200K  1/ 10W　
C 203
0. 1uF
R 203 18K  1/ 10W
　
R 212 220K  1/ 10W
　
R 210
20K  1/ 10W　
C N 202
CONN12345
678910 1
2
3
4
56
7
8
9
10
GN D
+C 202
470uF / 25V
C 212
100pF
R 2071K  1/ 10W...

 
- 78 – 
ViewSonic Corporation                              
 Confidential - Do Not Cop                                        VA1903wb/VA1903wm 
11.9  Key Pad 
           
SW001SW
2
13
4
5
C004 NC/ 0. 1uF/ 16V
LED _OR AN GE
Out -L
CN003
CONN
12
KEY 3
VC C _5V
KEY _AU TO
VC C _5V
C005 NC/ 0. 1uF/ 16V
KEY _D OW N _LEF T
R001 3K9 1/ 10W
SW005SW
2
13
4
5
715G2473-A for VA1903WM KEY
B
KEY PAD
A
11 F riday ,  N ov ember 24,  2006 Ti t l e
Size D oc ument  N umber R ev
D at e: Sheet
of
LED _GR EEN
SPKR _L+...

 
- 79 – 
ViewSonic Corporation           
 Confidential - Do Not Cop                  VA1903wb/VA1903wm 
12. PCB Layout Diagram 
 
12.1  MAIN BOARD PCB TOP VIEW 
 
 
 
  

 
- 80 – 
ViewSonic Corporation           
 Confidential - Do Not Cop                  VA1903wb/VA1903wm 
12.2 MAIN BOARD PCB BUTTON VIEW