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[Makka]

I had a problem 2 years ago in that the picture was continually erratic and jerky e.g. if a person was clapping the hands would clap normal then be a blur.
Watching football was painful on the eyes. my supplier lent me another box while he adjusted mine. He does not remember the problem.
I just replaced my tv with an old ntsn only model and when I turned it on I had to change the box from Pal to ntsn
The jerky picture is back
I reflashed the box but still the same
I have no idea on how to adjust the box to solve this prob
I can turn on the tv and also set up the monitor on the PC and while they are running side by side the PC is ok but the tv is jerky
Any help appreciated
Makka