Toshiba TLP510E Manuale di formazione tecnica - Pagina 40

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The sync signal process circuit is applicable to the HD,
VD, CS (composite sync), SYNC/G signals. HD (CS), VD
and G signals developed from QB011 enter the sync
separation IC (QB012: M52347FP). The sync separation
priority of the sync separation IC is; HD, VD, CS and
SYNC ON G in this order.
The HD and VD signals sync-separated enter the buffers
QB019 and QB020 (TC7S08F) and the outputs are sent
to the digital PC board.
RGB IN
13
14
Q512
TC74HCT240AF
HD/CS
VD
OUTPUT (R)
HOLD (R)
MAIN
OSD ADJUST
V
(R)
CC2
36
35
34
R
AMP
R
OSD MIX
R
CLAMP
1
2
3
BLK IN
INPUT (R)
V
(R)
SUB CONTRAST
CC1
QB011
M52348FP
2
R
5
G
7
B
8
RGB/HD
9
RGB/VD
11
VIDEO/R
13
VIDEO/G
16
VIDEO/B
17
VIDEO/HD
QV005
TDA9141
18
VIDEO/VD
V
(G)
GND2 (R)
CC2
SUB OSD
ADJUST (R)
OUTPUT (G)
33
32
31
30
29
R
BRIGHTNESS
R
G
HOLD
AMP
R
G
BLANKING
OSD MIX
R
G
CONTRAST
CLAMP
4
5
6
7
8
OSD IN (R)
V
(G)
SUB CONTRAST
CC1
GND2 (R)
INPUT (G)
(R)
7-4-3. RGB Signal Amplifier Section
The RGB signal processing section employs a wide band
RGB signal IC applicable to the XGA signal. Fig. 7-4-3
shows a block diagram of QB024 (M52320SP). The
control items of the IC are five items; main contrast,
brightness and sub contrast for each RGB.
The brightness and main contrast controls are provided
for the user adjustment, and the sub contrast are provided
to equal the R, G, B levels when entering A/D converter
of the digital PC board.
QB012
M52347FP
1
G IN
4
G OUT
25
H/CS
H OUT
22
6
IN
V OUT
21
8
V IN
Fig 7-4-2
SUB OSD
ADJUST (G)
OUTPUT (R)
V
HOLD (G)
GND2 (G)
CC2
28
27
26
25
24
G
BRIGHTNESS
G
B
HOLD
AMP
G
B
BLANKING
OSD MIX
G
B
CONTRAST
CLAMP
9
10
11
12
13
GND2 (G)
INPUT (B)
(G)
GND IN (G)
V
(B)
CC1
Fig. 7-4-3
7-13
QB019
TC7S08F
V
1
5
DD
2
3
4
QB020
TC7S08F
20
17
HD
V
14
1
5
DD
VD
13
2
3
4
HOLD (B)
GND2 (B)
SUB OSD
ADJUST (B)
(B)
NC
BRIGHTNESS
23
22
20
19
B
BRIGHTNESS
B
HOLD
B
BLANKING
B
CONTRAST
14
15
16
17
OSD IN (B)
MAIN
CONTRAST
SUB CONTRAST
GND2 (B)
(B)
+5V
HD
+5V
VD
MAIN
18
18
CP IN