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Digital processing issue---some have a jig or laptop that can be used (Panasonic has this) to reset the micro or eprom and correct this with out replacing a board....varies by model---Might give Panasonic a call and have some words......
This, sadly is getting to be a very common problem with all Projection LCD TV's Colored Blotches on an LCD Projection TV are usually caused by defects or marks on filters or lenses or one of the LCD panels themselves which are all located in the light engine (or optical block) First confirm that the lamp or main lens is not discolored by removing the lamp (unplug set and let cool before removing!) and inspecting the lamp itself and the lens that it shine onto. The light engine is an expensive part ($600-$1200) to replace and requires major disassembly. Get an estimate -Be sure to vote/rate me if this helped Thanks!
With the TV powered off, hold the volume down button on the front of the TV while holding down the TV/VIDEO button on the remote control at the same time for more than 5 seconds.
The TV will power on and you will be in the service mode - use the channel down and channel up keys to cycle thru the menus.