32
12. Video Signal Flow
Chapter 12 - Video Signal Flow
The video signal processing is performed on three boards (TU, Q and B) and the plasma panel as shown in
Figure 12-1. The composite video or component video is selected in the B board. The OSD is inserted into
the video path (not shown) later on in the B board signal chain. The output of the B board is digital video and
applied to the plasma panel. The video switching control for ICs on the TU, Q and B boards come from the
Main CPU, which is also on the B board.
10
IC3014
SW.
IC3001,
IC3011
SW.
CHROMA
PROCESS
STATES
8
6
1
3
5
4
2
8
10
6
3
2
3
1
TUNER VIDEO
L
R
L
R
COMPONENT
VIDEO
Y,R-Y,B-Y
(Y,Cr,Cb)
S VIDEO
COMPOSITE
VIDEO
SYNC
H+V
C
Y
VIDEO
R-Y
Y
B-Y
Cr
Y
Cb
H
V
CN1204/ CN1
CN102/
CN3004
CN3001
CN3002/
CN401
HD15
VGA
PLASMA
DISPLAY
PANEL
OUT 0
OUT 1
OUT 2
CLK OUT
OUT 3
H
V
FIGURE 12-1 - VIDEO SIGNAL FLOW
3TVP13 1433
4/12/02
TU BOARD
B BOARD
Q BOARD
5
4
7
5
7
6
11
9
9
8
15
13
11
10
19
17
+
-
+
-
+
-
+
-
+
-
Signal Levels
The tuner signal levels (Table 12-1) were taken with an NTSC generator set to channel 3. The S video levels
(Table 12-2) were taken using a DVD player. The component signal levels (Y, R-Y, B-Y in Table 12-3) were
also taken using a DVD player.
Table 12–1- Tuner Input
Signal Name
Location
Signal Level
Tuner Video (generator channel 3)
CN3004/pin 1
1.2Vp-p
Video
CN3001/pin 10
1.2Vp-p
Table 12–2 - S Video Input
S Video Signal Name
Location
Signal Level
Y
CN3001/pin 8
1.2Vp-p
C
CN3001/pin 6
0.6Vp-p
