not sure if this helps or not but most miniDV will allow you to set shutter speed in manual mode

I have done this with mine if I change it from the normal 1/100 to 1/60 the black line disappers and the there is only a very faint line that is a tiny but brigher then sournding pixiels and it only shows up as maybe 0.2" line thickness

I will take a vid some and post it soon