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Sony KP-FX432M31 Service Manual Page 9

Ax-1 chassis, crt projection tv.
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1-6. SELF-DIAGNOSTIC CIRCUIT
MG BOARD
IC0001
MAIN MICRO
STBY-LED
22 STBY-LED
CLKO 14
DATO 13
5 OCP
6 OVP
87 LOW B ERR
AC RLY 36
33 HV PROT
+B overcurrent (OCP)
+B overvoltage (OVP)
V-STOP
White balance failure
Low +B OCP/OVP
Horizontal deflection stopped
AKB 24
CRT
V PROT 56
VDY-
HG PROT 57
53 SCL
52 SDA
Q6105
Q6108
IC6201
1
< +15V
2
3
A BOARD
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.
IC6801 detects +B OVP condition and Q6802.
This sends a high signal to the micro and also shuts down the AC relay.
Occurs when an absence of the vertical deflection pulse is detected by pin 56 of
IC0404 (MG board)
Power supply will shut down when waveform interval exceeds 2 seconds.
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.
Occurs when set 5V is out.
Occurs when either :
1) a +B overcurrent is detected (Q6803), or
2) IC0401 (MG board) is damaged.
– 8 –
KP-FX432M31/FX432M91/FX532M91
RM-998
RY6000
<P_SW(-)
Q6102
D6803
<IK PROT2>
D6122
<+B OCP>
+B >
D6121
<+B OVP>
IC8001
1
< +B OCP >
RM-998
RM-998
+12V
Q5202
+15V
< H PLS
IC6801
2
Q6802
+B >
1
3
< +B
D6805
Q6803
D BOARD

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