Bravia KDL50W756 picture problem

[psychosax]

Hi,

I recently purchased a Bravia KDL50W756, my 3rd Sony Bravia in the last 10 years, but for some reason this new one is causing me some problems! When watching Sky HD box connected thru hdmi I am noticing that peoples faces, especially the bridges of noses! have a disrupted kind of speckled noise? Watching a dvd player thru hdmi or Netflix or YouTube etc there are no problems. I have reset the picture settings to default and gone thru each possibilty one by one but no luck?

any help or suggestions would be greatly appreciated