Daewoo 719B Service Manual page 25

6-2. Vertical
45Vp-p
Unstable or
Abnormal picture
Is
13V DC line
correct?
Yes
Is
the output
waveform of IC401
(pin 6) normal?
No
Is the
output pulse
of IC501 (pin 23)
normal?
No
Trouble in V.Sync line
or IC501 failure.
23
No
Check PWR
ambient circuit.
Yes
Check V.DY
and ambient circuit.
Yes
Check the IC401
or ambient circuit.
13V