Sony TRINITRON KV-1499XF Service Manual page 7

6. SELF-DIAGNOSTIC CIRCUIT
FROM
CRT
FROM
[+B] Q604 C3
[V] Q509/507
[+B overcurrent ªOCPº]
[Vertical deflection stopped]
[Vertical deflection overcurrent]
[White balance failure]
IC301
Y/CHROMA JUNGLE
21 IK-IN
MP/
18
PROTECT
SDA 35
Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON
and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven
verticals in a period, the unit will automatically turn off.
Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001
shut down the power supply.
Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be
shut down when detect this by IC001.
If the RGB levels* do not balance or become low level within 5 seconds, this error will be
detected by IC301. TV will stay on, but there will be no picture.
* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)
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IC001
SYSTEM
IO-8DAT 45
O-LED
51
46 IO-SDAT
KV-1499XF
IC003
MEMORY
5 B-DAT
RM-952