Daewoo CMC-1703B Service Manual page 17

Unstable or
Abnormal picture
Is
26Vdc line
correct?
Trouble in
power supply unit
Is
the output
waveform of !C401
(pin 1) normal?
45 p-p
V.DY
failure
Is the
output pulse
of 1IC401 (pin 4)
normal?
Yes Trouble in 1C401 or
its ambient circuit
Trouble in V.Sync line
15