I have a Beovision MX1000 to play with my Super Famicom. It is plugged via a SCART cable.
But every time I turn it on, the picture keeps scrolling vertically at varying speed. Sometime it seems to scroll horizontally as well.
The issue fixes itself after waiting for a while, but it can take up to 30 minutes sometimes which makes it very unconvenient to use.
I caught the issue in video if you want to see how it looks like:
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