Dtv Tuner Processing For Dtv Box Repair - Sony KD-34XBR2 Training Manual

DTV Tuner Processing for DTV Box Repair (HA-3 & RA-5A Chassis)
Refer to Figure 11-9 for the location of connectors and Figure 11-16 for the DTV tuner support signal diagram.
The DTV tuner needs various voltages for operation. They are easy to check at the Q box (CN7001). The DTV
tuner receives the 8VSB modulation and delivers that signal to Digital microprocessor IC7205.
DIG TUNER
1
CN7001 6.5V
2
ALL
3
GND
4
VOLT.
5V
5
FROM
9V
6
A BD. GND
7
33V
8
CN6005
A
B
1 1
2
3
CN7402 4
5
6
7
GRAY
A
B
1 1
VIDEO TO B BD.
3
4
5
CN8801
OSD CN004
7
8
9
VIDEO INPUT
11 11
WHITE
FROM B BD.
A
B
1 1
2
3 SUB
CN8601
5
6
MAIN
7
11 11
BLK
CN4404
CN4403
IC7205 is one of three microprocessors in this TV that communicate with each other. Two are in the Q box and
the Main Micro is on the B board.
IC9209 MIPS CPU
i Link operation
QI BD.
QM BD.
2 CH. AUDIO
(HA-3)
AUDIO (RA-5)
TO B BD.,CN009
25
A C
1
CN005
CN001/
CN2002
32
CN6005
CN6003
CN2001
FIGURE 11-9 - HA-3 CHASSIS CONNECTOR LAYOUT
Chart 11-10 –Microprocessor Responsibilities
IC7205 Digital Micro Processor
Memory Stick port access
DTV video & audio processing
DTV Tuner control
B BOARD
PLUGS INTO
CN2002 & 3
A B
1
CN3173
CN3103
CN002/
CN2003
CN3174
CN3171
A BD.
CN3170
CN6001
CN6505
CN6503
CN6502
FRONT OF TV
58
11. Video Process - HA-3 and RA-5A Chassis
PIN1 IS
CLOSEST TO
THE BACK
OF THE TV
BACK OF TV
CN5501
CN5505
CN5503
CN6506
CN6504
CN6501
IC001 Main Micro
Service mode & green user OSD
TV Protection / Diagnostics
Power Supply Control
NTSC tuner control
Q box reset & Master
communications
FBT
D BD.
38TVP12 1354 9/4/01