KP-FS57M31, KP-FS57M61, KP-FS57M90, KP-FS57M91 - Sony TV Service Manual (repair manual). Page 8

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KP-FS57M31/M61/M90/M91
RM-997
1-6. SELF-DIAGNOSTIC CIRCUIT
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135 V) line is detected by
Q6504.
Then the voltage to pin 5 of IC001 goes UP. The unit will automatically
turn off.
+B overvoltage (OVP)
Occurs when an overvoltage on the +B (135 V) line is detected by
IC6502.
Then the voltage to pin 8 of IC001 goes UP. The unit will automatically
turn off.
Vertical deflection failure
Occurs when an absence of the vertical deflection pulse is detected by
Q8001 and D8001. Shut down the power supply.
White balance failure
If the RGB levels do not balance or become low level within 5 seconds.
This error will be detected by IC4300.
TV will stay on, but there will be no picture.
High voltage or Horizontal Deflection Protect
Occurs when an overvoltage of horizontal pulse is detected by D8038
and IC8006.
If the voltage of pin 1 of IC8006 goes to High, the voltage to pin 57 of
IC4300go to UP. The unit will automatically turn off.
Audio Protector
If the Audio out lines become DC.This error will be detected by Q1211,
Q1209 and Q1210.
The unit will automatically turn off.
IC4300
Y/C JUNGLE
CXA2170Q
CXP961048-003Q
24 IKIN
From CRT (IK)
From G board
From IC1203,1204
(A board)
To H1 board
57 XRAY
From IC8005,8006
(D board)
56 V PROT
From Q8001
(D board)
IC001
SYSTEM
IC003
MEMORY
5 OCP
OCP
8 OVP
OVP
LED1 22
SPPROT
100
H
V
SDA 52
13 SDA0
SDA1
SDA
15
5
A board
E board
Q1209-1211
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