Self-Diagnostic Circuit - Sony Trinitron KV-HS29M90 Service Manual

6.

SELF-DIAGNOSTIC CIRCUIT

FROM
CRT(IK)
Q5018, D8035
(D Board)
Q5010
(D Board)
[+B overcurrent ªOCPº]
[+B overvoltage ªOVPº]
[Vertical deflection failure]
[White balance failure]
[High voltage undervoltage protection ªHV UVPº]
[Audio Protector ]
KV-HS29M61/M90/M91, HS34M61/M90/M91, HS38M61/M90/M91
IC4300
CXA2170Q
OVP
RGB JUNGLE
24 IK-IN
57
HPROT
SDA0 52
56
V PROT
Occurs when an overcurrent on the +B(135) line is detected by Q5004(D board). If
Q6610(D board) go to ON, the voltage to pin 5 of IC001(A board) go to UP. The unit
will automatically turn off.
Occurs when an overdrive on the +B(135V) line is detected by D6635(D board), Q6611
and Q6619. If Q6611 go to ON, the voltage to pin 8 of IC001 go to UP. The unit will
automatically turn off.
Occurs when an absence of the vertical deflection pulse is detected by Q5010. 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.
High-voltage undervoltage conditions may indicate defective transformer, rectifiers,
CRT or fault within the power supply circuit. When high-voltage drops for any reason,
so does the voltage at T8001.17 and buffer IC8004.7. The malfunction is detected by
comparator IC8006A that generates high logic signal labeled H PROT. This signal is
sent via D8014 to the H prot that opens contacts of the AC relay RY6501 and turns off
main power.
If the Audio out line became DC. This error will be detected by Q1211, Q1209, and
Q1210.The unit will automatically turn off.
– 7 –
IC001
OCP
SYSTEM
5
V PROT
H PROT 87
8
V PROT
15
46 IO-SDAT
LED
22
Au PROT
100
IC1203,1240
(A Board)
IC2602
( A Board)
IC003
MEMORY
SDA1
5
RM-997