ViewSonic VTMS2431 Service Manual page 73

8.3. CAM Tuner
1,2,4,12 +5V_General
I501
DTVS205EH201A
22
GND
23 1
GND NC
24 2
GND NC
25 3
GND NC
26 4
RFAGC1
GND NC
27 5
GND NC
28 6
GND NC
29 7
GND RF_AGC IF trace 15 mil ,Cover GND 12mil,GAP 6mil
8
NC
9
NC/VT
IF+
10
IF(+)
IF-
11
IF(-)
IFAGC
12
IF_AGC
IF_TP
13
IF_TP
SCLK
14
SCL
SDAT
15
SDA
16
GND
CAM_Tuner-5V
17
TU 5V
18
NC
Tuner-AFT
19
AFT
SIF_OUT
20
SIF OUT
ATV-CVBS
21
CVBS OUT
ViewSonic Corporation
measure current
L112 10uH
+5V_General
L113 NC D103 SR36
+ C137 C140
5 1
V_IN SW
470u/16V 100nF
2
GND
4 3
SHDN FB
R127 11K5 1% 0603
I106
Vout=VFB*(1+Ra/Rb)
FP6736S5PTR SOT23-5/SMD
VFB=1.25V
RB=0.7K~5Kohm
RFAGC1 2
30VTU
30VTU
IF+ 2
IF- 2
+ C159
IFAGC 2
R502 NC
1u/50V
T_SCL 2
T_SDA 2
R501
100K TUNER-SAR2
TUNER-SAR2 4
C501
R503 100nF
+
100K
Close to Tuner
Tuner-5V
C510
R511 NC
0R ATV_CVBS Q501
1
NC/MMBT3904
R588
0R
R513 C512
1K 0603 NC/680pF
C141 30VTU
100nF/0603
30VTU
+ C138 C142
Rb 100nF/0603
1u/50V/(4.7u)
Ra
R125
274K1% 0603
Tuner-5V
Close to Tuner
Tuner-5V
C168
470u/16V
R504
47K
C561
C506
NC
10nF/0603
R591 0R SIF_Q-B
1
NC/0
R587
R586
NC/2K2 R508
47K
Close to Mstar IC
L501
0R 0805 R512 C511
CVBS+ 62R 100nF TV_IN+
C513
R514
NC/330pF
NC/75R
R515 C514
47R 100nF TV_IN-
70
5VIF
L502 600R/1.5A 0805
1 5VIF
C505
100nF
R505
10R 0603
SIF trace > 15 mil
Close to Mstar IC
Q502
MMBT3904
R506 R507 C507
SIF_Q-E 10R 0603 SIF 47R 100nF SIF_IN+
R509
820R 0603 C508
22pF
R510 C509
47R 100nF SIF_IN-
TV_IN+ 4
TV_IN- 4
Confidential - Do Not Copy
Tuner-5V
2 Tuner-5V
C502 C503 C504
+
100uF/16V 100nF 1nF
SIF_IN+ 4
SIF_IN- 4
VTMS2431