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Sometimes the voltage can be set to high by the factory. Throughout time, blue dots will appear. You will have to remove the back cover off the tv, find the "voltage Screws (they are labeled) and turn down (left) JUST A Notch. Have seen this done many times.
Pray that the panel isn't blown out or bad projector tubes. They are expensive.
Blue dots and screen flicker are VERY common on the newer LCD and Plasmas
Also, if you have a pixel setting on your TV (not sure if that one has it) Try setting it to 480p.
Are you using component video cables? If so, check that these aren't loose on either end. Next I'd consider that whatever video cable/input might be bad, and switch cable or cable type... i.e. switch from component to HDMI or vice-versa. Then change up the source (cable box versus DVD player). If you're still seeing blue at this point, the TV internals are the bad.