Sony KDP-57XBR2 Training Manual page 41

Audio: DC voltage has been detected on one or both of the audio out lines. The set is shut down to protect the
speakers. This is usually caused by shorted audio amp IC406.
WDT: A communications error has occurred. The main CPU is unable to communicate with the Y/C jungle IC.
The timer LED blinks continuously at one-second intervals and as soon as 101 of them occur, a failure is registered.
Protection Circuits Not Covered By Self-Diagnostics
The block diagram shown in Figure 9-1 illustrates an overall view of the circuits that are monitored. Notice that
all of the protect items that appear on the diagnostic screen are connected to IC109 along with routing to the
relay latch transistors. If a problem develops on any of these lines, IC1009 will communicate this information to
the main CPU, IC1008 and the failure written to NVM along with the appropriate flash sequence of the timer LED.
RM +5V
+135V
T601/7
11V
+22V
Q101
+19V
LVP
+15V
+7V
MA BOARD
CN514
D3102
+5V 6 6
CN3101
OTMRED
IC1008
MAIN CPU
CXP85848-016Q
10SDAT
IC511
47
VIDEO
56
PROC.
55
CXA2101
AQ
8
5
IC6102
OVP OCP
2
uP393C
R6118
6
6
6
SDA
48
50
SCL
IC007
MAIN
ONVMWE 7
55
NVM
WP
10SCLK
49
FIGURE 9-1 - PROTECTION BLOCK
1
7
6 5
6 5
7 13
B+OVP B+OCP
IC1009
OSD CPU
CXP85340A-
2560
HV PROT.
H PROT.
V PROT.
50
SCL
6
SDA
5 48 A PROT.
A BOARD
38
9. RA-4/4A Protect Circuit Troubleshooting
G BOARD
D6124
LATCH
Q6102
Q6103
D6123
CN6101
6
6
CN505
D1007
D1005 D1006
R1104
3
4
R1107
5
R1113
6
R1116
VCC SW.
CIRCUIT
1
RY6001
2
AC
LINE
4 3
TO
D6002
FROM HV PROTECT
D8021/K D BD.
FROM H PROTECT
Q5006/C D BD.
FROM V PROTECT
Q5005/C D BD.
FROM A PROTECT
Q2610/C K BD.
9.1TVP14 5/23/02