Overall Block - Sony KD-34XBR2 Training Manual

The HA-3 Direct View TV Chassis and the RA-5A Projection TV chassis share almost identical B and Q boards
(except for software), making the video processing flow the same. The two sets differ in the location of power
supply and convergence stages. Refer to Figure 17-1 for the descriptions of these stages.
SPLITTER/
ISOLATOR
VIDEO
IN
(U, HB
BD.'s)
TUNER
A
PROTECT
ON/OFF
RY6501
Power Supply
The entire low voltage power supply is located on the G board. The standby power supply delivers 5V to the Main
Micro on the B board so it can respond to the power ON command form the remote or front panel. When the TV
is turned ON, the Primary power supply delivers low voltages to the " Q" (DTV decoder) box, the A, AD and B
boards.
Deflection and HV stage voltages (D board) are not present until the secondary power supply runs, so the TV is
still dormant in its initial stage. The Main Micro and Primary power supply start the secondary power supply to
complete the remainder of the voltages for set operation. The high voltage power supply starts after the horizon-
tal deflection operates.
Deflection
When the Primary power supply runs, it develops voltage to start the horizontal and vertical oscillators in Video
Processor IC3006 (A board). The horizontal oscillator from the A board is sent to the D board to produce the H
Drive signal used by the horizontal deflection amplifiers and HV stage (D board).
RA-5A Chassis Overall Block
VIDEO A
IC401
A/V
SW.
VIDEO B
TUNER B
IC001
MAIN MICRO
AC
ANALOG
RELAY
TUNERS
SEC
P.S
G BD.
PRIM
STBY
P.S
P.S
STANDBY
5V
FIGURE 17-1- RA - 5A CHASSIS OVERALL BLOCK
MAIN
ANALOG
SYNC
VIDEO
SUB
PROCESS
SYNC
Hi-SCAN
VIDEO
B BD.
6 SCREEN
A BD.
SENSORS
H+V
AD
BD.
MAIN
RGB
SW.
D BD.
R G
H H
R
G
HIGHER
V
VOLTAGES
IC8001,
IC8002
CONVERG.
AMPS
LOW
VOLTAGES
75
17. RA-5A Chassis Overall Block
DRC
MID
SYNC
R DRIVE
I3006
G DRIVE
VIDEO
PROCESS
B DRIVE
IC8003
B
V DRIVE
H
B
V V
HV CONVERTER
H DRIVE
DEFLECTION
DTV
TUNER
Q BOX
CR
R
CG
G
CB
B
R
G
V DY
B
HV
H DY
8/31/01
49TVP12 1351