Sony KV-29FA350 Service Manual page 9

Self-Diagnostic Circuit
Y/CHROMA JUNGLE
FROM
CV BOARD
IC751 PIN 5
A BOARD
FROM
Q816
COLLECTOR
+B overcurrent (OCP)
Occurs when an overcurrent on the +B (135V) line is detected by pin 32 of IC001 (A Board). If the voltage of pin 32 of IC001 (A Board) is more than 4V
when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.
V-Protect
Occurs when an absence of the vertical defl ection pulse is detected by pin 13 of IC001 (A Board). Power supply will shut down when waveform interval
exceeds 2 seconds.
IK (AKB)
If the RGB levels* do not balance within 15 seconds after the power is turned on, this error will be detected by IC001 (A Board). TV will stay on, but there
will be no picture.
Power Supply NG (+5V) for Video Processor
Occurs when IC001 internal HV protect detects an abnormal H-Pulse (frequency) due to improper power supply to IC001. The TV cuts off high voltage
power of anode CRT. No picture will be detected. eg: faulty IC602 or IC604
KV-29FA350/29FA750
A BOARD A BOARD
IC001 IC804
V.OUT
84 IK
F.B-PLS
32 EHTO
A BOARD
IC001
SYSTEM
SDA1
3 13
V.GUARD
RED LED
A BOARD
MEMORY
99 5
SDA
122
DISPLAY
KV-29FA350/29FA750
IC003
9