Daewoo 432X Service Manual page 22

6-2. Vertical
40Vp-p
Unstable
picture
Is the
15Vdc
line voltage is
correct?
Yes
Is the
pulse of pin 4, 6 of
the IC401
correct?
No
Is the output
of pin 12,13 of IC501
all normal?
No
Check the IC501 and
its ambient circuit
20
No
Refer to P. S. U
Yes
Trouble in
vertical D. Y
Yes
Check IC401 and
its ambient circuit