57
11. Video Process - HA-3 and RA-5A Chassis
These three (Main, DTV and Sub) signals are input to MID IC8703. This MID IC will select either one input for
normal TV operation or combine two inputs into a single picture for the Twin mode. The signal from MID IC8703
will continue into OSD IC8801.
Chart 11-9b - QM board Signal Processing (continued)
IC – Signal Flow
IC Name
Purpose
IC8703
MID-XA (Multi Image Driver)
Twin View, H freq. conversion
IC8801
OSD
Buffer for video, Menu OSD
IC8805
D/A
Analog Conversion
Video Process 3
Refer to Figure 11-15 to follow the signal flow. The conversion of Component video to a high-resolution picture by
the DRC and then being sized by the MID circuitry to fit on the screen is performed on the QM board. The
component video output passes through the B board into the A board. The (white) menus OSD at CN004/pins A7-
9 mix with the green OSD graphics (channel numbers, volume etc) from the main micro using Q9, Q11 and Q13.
The combined OSD signal and buffered component video are applied to Y/C CRT Drive IC3101 on the A board.
IC3101 mixes the video signal and OSD then converts the result into an RGB signal for the CRT on the C board.
FIGURE 11-15 - VIDEO PROCESS 3
IC004
NVM
IC001
MAIN MICRO
M306V2MF
IC9002
IC3101
Y/C,CRT
DRIVE
CXA2
150AQ
C15
C13
C16
C17
C12
C11
A5
A4
A3
A7
B6
A9
Q9, Q11,
Q13
MIXER
7
1
3
5
8
IC9001
IC9003
OSD B
SCREEN
VOLT.
CONT.
Q9014
Q9012
Q9008
+
+12V
VERT.
HORIZ.
DRIVE
IK
P MUTE
P MUTE
R9053 R9083
R9064 R9084
Q9002
Q9001
BUFF.
G2
VOLTAGE
FROM
FBT (D BD.)
Y
P
B
P
R
OSD R
OSD G
OSD
CN3101/CN9001
CRT
CATHODES
CN001/
CN3020
V MID
TO
IC8601-
A/D
QM BD.
+12V
SCREEN
VOLT.
TO CRT
CN8801/
CN004
QM BD.
A BD.
B BD.
C BD.
R
G
B
C22
10
ALL
VIDEO
P MUTE
HD VIDEO 5,6
FROM IC200-
COMP I/F
B19
A20
OSD
RGB
S CLK
CN002/
CN3022
S CLK
S DATA
S DATA
9
16
14
IC002
SW.
M52055
67
28
31
S CLK
26
25
21
20
22
5
4
6
63
62
64
58
8/30/01
5TVP12 1322
SW. IS SERVICE
MODE ENABLED
ONLY
MENU
Содержание KD-34XBR2 - 34" Hdtv Fd Trinitron Wega
Страница 77: ...74 RA 5A Chassis Board Layout ...
Страница 108: ...APPENDIX ...