Daewoo 531X-3 Service Manual page 12

6. Unstable Picture
6-1. Horizontal
Unstable
picture
Is the
pulse of pin 1 of
the IC501
correct?
No
Is the
pulse of pin 34 of
the IC201
correct?
5Vpp
No
Is the
input H.Sync
correct?
No
Trouble in Signal Cable
or 15P D-Sub Connector
Trouble in IC501
Yes
or its ambient
circuit
Yes
Check IC501 and
its ambient circuit
Yes
Check IC201 and
its ambient circuit
20
6-2. Vertical
Unstable
picture
Is the
14V,-13V
line voltage is
correct?
Yes
40V
Is the
pulse of pin 5 of
the IC401
-10V correct?
50Vp-p
No
Is the output
of pin 23 of IC501
all normal?
No
Check the IC501 and
its ambient circuit
No
Refer to P. S. U
Yes
Trouble in
vertical D. Y
Yes
Check IC401 and
its ambient circuit
21