Self-Diagnostic Circuit - Sony KP-FR43M31 Service Manual

KP-FR43M31/FR43M91
RM-GA001

1-6. SELF-DIAGNOSTIC CIRCUIT

MAIN MICRO
STBY-LED
22 STBY-LED
5 OCP
6 OVP
87 LOW B ERR
33 HV PROT
+B overcurrent (OCP)
+B overvoltage (OVP)
V-STOP
While balance failure
Low +B OCP/OVP
Horizontal deflection stopped
MG BOARD
IC0001
CLKO 14
53 SCL
DATO 13
52 SDA
AC RLY 36
Q6108
IC6201
1
2
3
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.
AKB 24 CRT
V PROT 56
VDY-
HG PROT 57
RY6000
<P_SW(-)
Q6102
Q6105
D6803
<IK PROT2>
D6122
<+B OCP>
< +15V
D6121
<+B OVP>
A BOARD
– 6 –
+12V
Q5202
< H PLS
IC6801
+B>
+B>
IC8001
Q6803
1
<+B OCP>
D BOARD
+15V
2
Q6802
1
3
< +B
D6805