Daewoo 712B Service Manual page 23

6-2. Vertical
45Vp-p
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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.
21
No Check PWR ± 13V
ambient circuit.
Yes
Check V.DY
and ambient circuit.
Yes
Check the IC401
or ambient circuit.