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Sony KDP-51WS550 Service Manual page 9

Color rear video projection
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Self-Diagnosis Function Operation
+B overcurrent (OCP)
Occurs when excessive current flows through R6812. The increase in voltage across Q6803 causes it to turn on which sends a high signal to the
micro.
+B overvoltage (OVP)
IC6801 detects +B OVP condition and turns on Q6802. This sends a high signal to the micro and also shuts down the AC relay.
V-STOP
Occurs when an absence of the vertical deflection pulse is detected by pin 56 of IC0401 (MA 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 IC0401. 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 Deflection Stopped
Occurs when either:
1) a +B overcurrent is detected (Q6803), or
2) IC0401 (MA Board) is damaged.
Self-Diagnosis Block Diagram
IC0001
MAIN MICRO
STBY-LED
STR
48
STBY-LED
44
OCP
45
OVP
43
LOW B ERR
5V
MA
CLKO
28
DATO
31
AC RLY
69
1
4
Q6102
Q6105
D6803
Q6108
D6122
A
D6505
D6121
IC6201
O
I
O
MA
IC0401
Y/C JUNGLE
AKB
58
CRT
SCL
53
56
VDY-
VPROT
R5104
52
SDA
57
HPROT
R5125
RY600
Q5018
P_SW(-)
2
3
1K-PROT2
+B OCP
+BVOP
— 9 —
KDP-51WS550/57WS550/65WS550
R5105
BM
D
2
IC5007
14
IC6801
+B
1
R6812
+B
D
D6805
R6803
+B OCP
5V
Q6802
2
3
+B
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