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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......
When you replaced the color wheel it had two cables that connect into the DMD metal box.
One is a 3 or 4 pin connector with a plug.
The other is a flat ribbon cable usually orange in color.
What sometimes happens here is the ribbon cable only has contacts on one side---same with the socket it slides into.
It is quite possible you got the ribbon cable in backwards---contacts on the ribbon cable not facing or connecting to the socket.
Usually on these sets the socket will have the contacts facing the back of the light engine--
Remove the light engine again and check this out--if you got it in backwards (I did it many years ago the first time I did one) the set will detect the color wheel is not connected and NOT ALLOW THE LAMP TO COME ON.
Lots of videos and instructions on the internet do not tell people about this simple mistake that can be made.
If the set worked before, I bet you got the ribbon cable in backwards---no big deal.......
Let me know if this helps by rating this solution.
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Try changing the settings for the video formats, widescreen, regular, and all that. There are angle mirrors in the back of the tv that direct the projected image on the screen. The mirrors are positioned such that if, says, a piece of a metal bracket or something falls down inside the projection area, it'll fall right against the projection lens and block the image. Open up the back of the tv and follow the light path from the screen backwards to its source and make sure there's no debris in the projection path.
in your menu there is a couple of options, one for use with mirror that flips the picture, another that flips the pic for mounting upside down. and another for flipping it upside down with mirror.
please select normal in this option as your prob just mounting it on a desk or table.
Since this is an LCD projection television I would check to see if there is an image on the LCD screen. if there is not I would check the circuitry connected to the LCD. Now if there is an image on the LCD screen I would make sure that the white light bulb is working. Now this might seem backwards, but I have seen folks replace a blown bulb only to find out that the LCD screen was gone also, so this little bit of reverse angle troubleshooting will at least help you solve a major problem first and then allow you to move on to the simpler problem of a blown bulb.
the problewm of your unit is in the chroma section. if you find a intermittent trouble my sulotion it could be a loose contact layout circuit. and if your not inclined with this job contact for a service technician.