Sony KP-57WV600 Service Manual page 9

Self-Diagnosis Function Operation
+B overcurrent (OCP)
Occurs when excessive current ß ows through R5013. The increase in voltage across R5013 causes the output of Q5004 to go high, and this high
signal goes to the micro.
+B overvoltage (OVP)
IC6505 detects +B OVP condition and turns on Q6522. This sends a high signal to the micro and also shuts down the AC relay.
V-STOP
Occurs when an absence of the vertical deß ection pulse is detected by pin 24 of IC2801 (B Board). Power supply will shut down when waveform
interval exceeds 2 seconds.
White Balance Failure
If the RGB levels* do not balance within 2 seconds after the power is turned on, this error will be detected by IC2801. TV will stay on, but there
will be no picture.
*(Refers to the RGB levels of the AKB detection Ref pulse that detects 1K).
Low B OCP/OVP
Occurs when set 5V is out.
Horizontal Deß ection Stopped
Occurs when either:
1) a +B overcurrent is detected (IC5007), or
2) overheating is detected (Thermistor TH5002).
Self-Diagnosis Block Diagram
IC2300
MAIN MICRO
STBY-LED
STR
48
STBY-LED
44 OCP
45 OVP
43 LOW B ERR
5V
M
CLKO
29
DATO
30
AC RLY 69
Q6527
Q6530
Q6532
D6537
A
D6505
D5007
IC504
O I UNREG 7V
O
M
IC2801
Y/C JUNGLE
AKB
58 CRT
SCL
26
35 VDY-
VPROT
R5104
25 SDA
HPROT 34
R5125
RY6501
Q5018
P_SW(-)
1 2
4 3
D
1K-PROT2
4
+B OVP UNREG 11V
3
HV PROT
— 9 —
R5105
B
D
2 IC5007 14
IC6505
PH6501
+B 1
1
2
R5013
+B
D
Q5004
D5005
+B OCP
KP-57WV600/57WV700/
65WV600/65WV700
5V
Q6522
2
3
+B