Sony KV-29AL40 Service Manual page 6

KV-29AL40/KV-29AL40A/KV-29AL40C
6. SELF-DIAGNOSTIC CIRCUIT
Y/CHROMA JUNGLE
FROM
21
IK IN
CRT
FROM
18
IC521 HP/PROTECT
PIN 7
+B overcurrent (OCP)
Vertical deflection stopped
White balance failure
IC301 IC541
V.OUT
REF
SDA
35
Occurs when an overcurrent on the +B(115V) line is detected by pin 18 of IC301. If the
voltage to pin 18 of IC301 is less than 1V 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 pin 17 of IC001.
Power supply will shut down when waveform interval exceeds 2 seconds.
If the RGB levels* do not balance within 2 seconds after the power is turned on, 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.)
IC001
SYSTEM
IO-BDAT
3 17 I-PROT
O-LED
37 SDAT
—
6 —
IC003
MEMORY
5
21 B-DAT
18