My plazma seems to have a pixelated / grainy picture - even on HD Channels. I have had the airel checked and signal strength is really good. The problem seems most apparant with moving images or flashing lights etc.
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Check the signal strength. If the signal strength is weak, this can happen to digital channels. For analogue channels, the fault due to weak signal will be a grainy picture. http://electronicshelponline.blogspot.com/
Just add the same problem. You need a HD set top box, supplied by your cable co. Your picture quality will depend on the strength of the HD signal. If you have correct box and signal, you may need to double click your remote select button to activate HD channels/
Without HD content, the TV will scale up the smaller-sized video. This means it will "stretch" the content, making it grainy or pixelated. The only way to get better quality video is to get HD service.
If you are using the TV's tuner and an aerial, the aerial has a problem , (one of the reflectors/elements has come off or is bent) or the tuner unit has gone low gain at the lower frequencies. Have a look outside at your aerial. Or there is a poor connection in the aerial system. Hope that helps
The pixellation on cable channels usually indicating poor/weak cable signal. You may want to have the cable signal strength check out by the cable company, check your cable connection at the entrance of the house to make sure they are clean and tight, try connect and disconnecting them. You are not the cable company cable box are you? My had to be replaced twice by Comcast, they were running very hot.
Your old TV was most likely a SD (Standard Definition) TV. SD signals look better on SD TV sets than they do on HD TV sets. This is normal. If you will, imagine having a tiny wallet photo reprinted as an 8"x10" photo. The image would be grainy and not have the crispness of the original. This is the same principle. Your SD source is being blown up to fill an HD screen. Once you add HD to your programming, the old TV will be forgotten. I hope this was helpful.
Pixelation is caused by poor signal strength. Check the signal strength in the setup section. Unfortunately some boxes and TVs don't handle poor signal as well as others. It might be worthwhile trying a signal amplifier