Picture shadow - Mitsubishi WT-42413 42" Rear Projection HDTV-Ready Television

if you're using pop up flash, you'll get more shadows doing a portrait shot than a landscape shot just due to the position of the flash bulb and the angle the shadows are cast.

What you described sounds like a convergence problem. When convergence has failed the colors will commonly look 3D,warped, etc. This tips page here on Fixya has more details.

Its a Good Possibilty that its the New Color Wheel causing this,if the colors are not complete on the color wheel then that will be why you are seeing shadow on right hand side of screen.
I know I ordered color wheel for mine and had to send it back,it did the same thing.
I compared it to the old color wheel and the new one did not have Solid colors on it.

Can you see picture behind the shadow? or is it shadow and no picture?

It's most likely the shadow of the lens. The flash is above and to the left of the lens, so the shadow of the lens will be to the right and below.

Tv have a problems known as a convergence problems,it dead.The tv colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures look like.The tv convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts,must be replaced on the tv convergence board to solved the tv picture convergence problems.The shop,will cost u $300-350 for parts and labors.

Convergence problem on rear projection CRT TVs.

Are you using a lens hood? That could create the shadow.

yes sounds like a convegence issue.

I have the same problem and was told by a technician that I need to replace the light engine. Probably around $ 700.00.

Im sorry i dont understand what you mean"I have a shadow on my picture"??? Please be more discriptive? Thanks . Maybe a picture of it??