Sony BA-4D 서비스 매뉴얼 - 페이지 4

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KV-27S42/27S46/27S66/29AL42/29AL42C/29AL66/

29AL66C/29SL42/29SL42C/29SL46/29XL42M

Self-diagnostic Circuit

Y/CHROMA JUNGLE

FROM

CRT

FROM

IC521

PIN 7

+B overcurrent (OCP)

Vertical deflection stopped

White balance failure

IC301

IC541

V. OUT

IK IN

REF

HP/PROTECT

SDA

Occurs when an overcurrent on the +B (115V) line is detected by pin 18 of IC301. If the voltage

of pin 18 of IC 301 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 1K.)

IC001

SYSTEM

IO-BDAT

I-PROT

O-LED

IO-SDAT

— 6 —

IC003

MEMORY

B-DAT

DISPLAY