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GB 94
9.
Block Diagram
There is one configuration as shown below.
RF to Main Tuner
TUNER - 7201
CVBS-PIP_TUN1-2-CVBS-IN
CVBS_TER_OUT
7402-B
2
1
15
SEL_TUNER1
10
12
7402-A
14
13
11
NAFTA & AP-NTSC
SEL_TUNER2
7401-B
2
CVBS-SC1_AV1-IN
5
1
15
CVBS-SC2_AV2-IN
3
SEL-MAIN-R1R2
Y-CVBS-FRONT-IN
7401-A
12
C-SC2_SVHS-IN
13
C-FRONT-IN
11
3
7403
SDA
IO
2
SCL
EXPANDER
Circuit Description
IF & Video section
The TV uses one RF input to the DW's tuner with a splitter.
The tuner on the main board receives RF from the splitter.
Due to this configuration, the main board tuner always
processes the Main picture while the DW tuner always
processes the Sub picture. If the picture between the two
tuners needs to be swapped, then the tuners' RF frequencies
are swapped.
EM1A
Circuit descriptions and abbreviation list
1352
4
11
1
5
1
2
PIP-AUDIO
8
IF
16
AP & LATAM
+
1333
24
29
7401-C
4
26
20
14
SEL-FRNT-RR
4
SEL-MAIN-R1R2
5
SEL-FRNT-RR
6
SEL_TUNER1
7
SEL_TUNER2
9
FBLK
10
GUIDE+
RESET
11
SEL-YUV_RGB
12
SEMI-STD-BY
70
94
98
DOUBLE WINDOW PROCESSOR
IC7801
SAB9081H
72
87
81
49
56
TDA888X
IC7301
RGB/YUV
+
COLOUR
DECODING
41
54
60
7402-C
5
7
4
3
V-CHIP
SEL_PIP_CVBS
Figure 9-13
IF-TER from the tuner is fed to pin-1 & 2, IF circuits of
TDA888x IC7301 via a SAW filter. The AGC voltage for the
tuner can be adjusted in the SAM's tuner menu.
Dependant of the region execution, different SAW-filters are
applied.Therefore circuit diversity is unavoidable as shown in
figure below. The RESET-signal is used to set the SAW-filter
to different IF frequency modes. Table below shows IF
frequency settings by the RESET signal.
0205
4 3 1
2 100
4
3
2
6
8
DY
12
7
12
11
DU
8
10
10
DV
7803
68
TDA8601
79
83
RGB
SYNC
OUTPUT
MATRIX
RGB
INPUT1
RBG/YUV
RGB/
MATRIX
YUV
INPUT2
YUV INTERFACE
42
43
40 45 46
14
SDA
7501
15
SCL
NAFTA ONLY
CL 06532045_070.eps
6 8 9
10
010800
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