I've purchased a Samsung UE48H6670 as a slight second. My other TV had been picking up all channels analogue and digital absolutely fine, but this one hasn't managed to at all? On first installation it found all channels but lots were very pixelated and unwatchable. After returning from work today and turning it on it had no channels tuned in! And now it can only find about 26 channels all digital and from channel 56 onwards? I've tried numerous autotunes and no luck. Why would it work for one TV but not the other? Any help would be greatly appreciated!!