I don’t think the cable or the Chinesium box you have is the problem. There is a YouTuber in the USA who uses something similar. But he uses a Dell Monitor and can use PAL or NTSC modes without issue.
The problem could be on your Motherboard or the Television/Monitor you are using perhaps?
I use that same setup on A1200 and A600 systems on a PAL setup using a Dell monitor without issue.
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