Wacko, where did you purchase your Sharp LCD? How much, cash or CC? What about warranty? I don't know much, but what I read here for Astro, try to use S - Video cable for better picture.
Maybe you can ask you Astro installer to retune the dish, and get the reading ( sorry I forgot what it is called, it's the graph that shows signal strength ) to above 90. What a friend of mine who works at Astro told me, normally most installers only try to get between 70 - 78 signal strength only ( my personal experience, saw three installers, and they all do the same, the most I've seen is 78 ), which is barely enough to get the best reception.
He also recommended me to look for an Astro installer who can align the dish so that the reception strength is at least 85, if can get more than that, much better, especially during windy days ( a problem for high - rise homes ) and rain.
Have you tried to tune the LCD tv yourself? Check this link out :
Cnet Asia LCD TV Tuning Tips and try it out. Don't forget to "tune" the room where the LCD tv is placed, like lighting, shades for the windows ( if any ) etc.
L shop... RM29XX-Cash. Warranty 1year only.