Daewoo 531B Service Manual page 22

6-2. Vertical
40V
-10V
50Vp-p
Unstable
picture
Is the
12V,-12Vdc
line voltage is
correct?
Yes
Is the
pulse of pin 6 of
the IC401
correct?
No
Is the output
of pin 8 of IC501
all normal?
No
Check the IC501 and
its ambient circuit
21
No
Refer to P. S. U
Yes
Trouble in
vertical D. Y
Yes
Check IC401 and
its ambient circuit