When we set this Tv up , the picture was good but there was a high pitched, painful to the ear squeal. We thought it was the cable box, had the company out, not the problem. I researched on the internet and others had this problem and it was the power board. I Called Aquos and told them the problem and what we thought it might be, they sent out a repair crew, who thought it might be the speakers, or main board. They returned a few days later and replaced those two items, but the high pitched squeal remained. So they agreed to try and replace the power board. Another trip a week later and they replaced the power board... Ta da, the squeal was gone BUT now we could no longer connect to the internet wirelessly, which apparently is a main board issue. Arghhhhhhh. After a number of conversations with Aquos , they finally agreed to replace the whole thing, which they delivered today. It's now working, cross my fingers it stays that way. Also,we used the calibration settings listed here and they greatly improved the picture quality.
Bottom line, after 5 different service calls, it's a great picture, the wireless access is fabulous for the wii and apple TV, it was just very painful and time consuming to get to this point.
ps .the delivery guy said they have quite a few of these TVs, 60 and 52 inch that they have to pick up. At least Sharp replaced it, hopefully they'll continue to stand by their product if it goes haywire again.