[old_tv_nut]

If the pairing is caused by poor v sync filtering, it could be fixed by changing part values, but more often than not it is caused by ground currents from H sweep, which is unfortunately tied up with the physical chassis design and grounding. Special countdown or flipflop circuits can force interlace, but this can actually cause trouble with cheap random interlaced sources.

Sent from my LG-LS970 using Tapatalk