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4. IMPROPER HORIZONTAL OR VERTICAL SYNCHRONIZATION
There is no stable. It moves horizontal or vertical direction.
[
IMPROPER SYNC.
Do proper horz.and vert.
NO
I
sync. signals appear at
Check signal cable.
the end of signal cable?
YES
NO
Does proper vert. sync.
Does picture moves horz.
signal appear at the #3 pin
direction?
of IC301?
YES
YES
I
Does proper horz.sync.
NO
Check IC301 ,0303,R303,
signal appear at the #3
R304, R305, C302, D530,
pin of IC302?
R530,C530,C531.
YES
Check IC302,VR301 ,R322,
C305, C306,C311,C312.
5. BLANKING FUNCTION DEFECT.
I
NO
Check IC301, D530,
R530, C530, C531
Check IC201, C202,
C203, VR201, R206
Vertical retrace line appears on the screen when the external brightness control(VR502) is set to the high
range.
BLANKING FUNCTION
DEFECT
I
Does 5V appear between
NO
Check R530,D530,C530,
the cathode of D530 and
C531.
ground?
I
Check 0201 ,R225,R226,
R227,C215.
16
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