Read Sony KV-29AL40 Service Manual online
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6 —
KV-29AL40/KV-29AL40A/KV-29AL40C
6. SELF-DIAGNOSTIC CIRCUIT
+B overcurrent (OCP)
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.
Vertical deflection stopped
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.
White balance failure
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.)
IK IN
HP/PROTECT
FROM
CRT
FROM
IC521
PIN 7
PIN 7
I-PROT
O-LED
IC001
SYSTEM
IC301
Y/CHROMA JUNGLE
REF
IC541
V.OUT
IC003
MEMORY
B-DAT
IO-BDAT
SDAT
SDA
21
18
35
3
17
37
18
21
5
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