There are many differnet video/TV format. North America and Japan use NTSC, the rest of the world use PAL. But the trouble is that there are a few PAL formats, all PALs use the same picture but different stand. The UK use PAL-I which is different from the rest of Europe.
Another thing to try: Reverse the SCART lead. The SCART should have no direction, but sometime it solve the sound problem just reverse it. Strange, but it works for me and one of my friend on anther cheap model.
Also you could try different connection method. If all fail, then the player must be faulty.