Okay, that's becouse there aren't any modeline available for 50 Hz, never mind, if sharp says it is 60Hz & PAL capable that's not the problem.
Well, may be I didn't understand the case:
Do you mean the image is stable if no movement is present and it becomes unstable if there is movement? (all screen messed or synchronism lost...)
Or you mean that appears pixelation or other artifacts? (squares, lost pixels, extrange colors).
I'm trying to dilucidate if it is a hardware related issue (don't panic, I mean hardware configuration) or a mere software problem.
I've got a Danish friend, she's called Siri. I haven't seen her for a long time, may be I call her