I bought this after quite a bit of research. Originally bought a Samsung LED, but could not stand the unrealistic image & color. Returned it for this and couldn't be happier. Picture is awesome. Wifi and smart TV is great and works flawlessly - Netflix, Amazon Prime, Hulu, etc.
Some minor things that are annoying: commercials pop up when you turn on the TV or perform certain functions. Speakers are a bit weak - during the day you need to blast them up to 50% or higher. Has ability to surf the internet, but no Adobe Flash support, so can't watch online content - e.g. episodes of shows from network TV (abc.com). Lastly notice a "burn-in" effect occasionally (SmartViera logo). It's not dominant, but it's there - even though we were careful not to pause shows during the first month or more.
I have had my system for a year come the end of September. I use it for CaTV (1080P), Home Theater (1080 again), BluRay, DVD and several smart TV functions like Netflix and Amazon prime video, plus screen sharing from Android over WiFi. In other words it is getting a good workout. I do no have green dots, nor dots of any kind.
What I would check first is the cabling. A lot of times, video noise (think VGA or SVGA here as an example) can be caused by cables that have become kinked or severely twisted, are picking up noise from adjacent power sources, or by a connector that may have damaged the HDMI receptacle. Even if you have to run a new cable over the floor to see if that is the problem (don't pull it into the same space as the existing cable just yet) between the video source and the TV. Before doing that, try Netflix or something that doesn't use the cables in question. If that is OK, look to your cables for the problem...
I really hope that helps!