Protection Block (Ra-5A Chassis) - Sony KD-34XBR2 Training Manual

Refer to Figure 20-1 for an overview of the protection circuits.
When a serious problem occurs, this TV will protect the remainder of its circuitry and the picture tubes in one of
the following ways:
•
TV shutdown (AC relay is turned off);
• TV Latched OFF (AC relay is held off); or
• Picture is blanked to produce a dark screen (no RGB signal to the CRT cathodes).
When the TV is placed in one of these protective states, IC001 also indicates the cause by blinking the
Standby LED a number of times, pauses, and then repeats the same count.
G BD.
+135v
3X
OVP
AC IN
0X
OVP
POWER
15V
0X OFF
OVP
LATCH
22V
0X
OCP
AC
RELAY
POWER
ON/OFF

Protection Block (RA-5A Chassis)

CN001/
CN3020
6X
C24
SUB
6.5V
8
OVP
0.02V
OCP
OVP
0.1V
7
6
0.1V
CN6101/
+135v
CN3016
OCP
2X
0.2V
5
4.6V
4
FIGURE 20-1 - PROTECTION BLOCK - RA-5A CHASSIS
B BD.
IC001
MAIN MICRO
S DATA
A25 C25 C26 B19
CN013/
CN3022
OCP
IC3006
VIDEO
PROCESSOR
85
20. RA-5A Chassis Protection Block
STANDBY
LED
(HA BD.)
CB BD.
S CLK
CG BD.
A20
CN3011/
CN3703
9 2
IK
5X
CR BD.
7
CN3005/
CN8004
6
CN3007/
CN8006
A BD.
B IK
2
G IK
2
R IK
V LOSS
4X
7X
H.PULSES
D BD.
33TVP 1351 9/4/01