[old_tv_nut]

Junction of R46 and C48 has 180k going to sync waveform and 560 ohms going to vert oscillator, so I would expect to see a lot of vertical oscillator waveform plus some sync - so maybe what you see is normal? During the several seconds the waveform is changing so drastically, do you have a picture, or has it not warmed up enough yet? The changing waveform may be meaningless if it's just some circuits running and others still starting up.