I have a green dot on my screen of my JVC HD52G887

Hello. If it resembles a tiny bright green dot, this is most probably a dead pixel. In the troubleshooting guide in the user manual, the manufacturer states that some pixel loss is normal--either they will be gone or permanently "on". If the unit is new(i.e. still under some warranty) talk with the supplier about options--they *may* decide to replace it if the dot is in a particularly annoying location. Be aware though, they won't be under obligation to do so. I own a LCD projector with a few visible pixels--as devices such as these(lcd tv's, projectors, plasma, etc.) age, this type of phenomenon is going to occur. Normally--and this certainly isn't always true, there is a tolerance of 3-9 pixels. Check with the supplier and/or manufacturer for individual specs. Especially if the unit is under warranty!--Hope I successfully assisted you.---Rick