Self-Diagnostic Circuit - Sony KP-FS43M90 Service Manual

1-6. SELF-DIAGNOSTIC CIRCUIT

From CRT (IK) 24 IKIN
From IC8005,8006 57 XRAY
H
(D board)
V From Q8001 56 V PROT
(D board)
+B overcurrent (OCP)
+B overvoltage (OVP)
Vertical deflection failure
White balance failure
High voltage protector of Horizontal Deflection
Audio Protector
From IC1203,1204
(A board)
IC4300
Y/C JUNGLE
SDA 52
CXA2170Q
E board
Occurs when an overcurrent on the +B (135 V) line is detected by Q6504.
If Q6504 go to ON, the voltage to pin 3 of IC001 go to UP. The unit will
automatically turn off.
Occurs when an overvoltage on the +B (135 V) line is detected by IC6502.
If IC6502 go to ON, then voltage to pin 6 of IC001 go to UP. The unit will
automatically turn off.
Occurs when an absence of the vertical deflection pulse is detected by
Q8001 and D8001. Shut down the power supply.
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.
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 20 of
IC4300go to UP. The unit will automatically turn off.
If the Audio out lines become DC.This error will be detected by Q1211,
Q1209 and Q1210.
The unit will automatically turn off.
From G board
OVP OCP
IC001
SYSTEM
5 OCP
LED1 22
8 OVP
Q1209-1211
100 SPPROT
13 SDA0 SDA1
CXP961048-003Q
– 8 –
KP-FS43M90/FS53M90
RM-998
To H1 board
IC003
MEMORY
15 5 SDA
A board
RM-998