Partial blacking / shadowing of the screen

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?

If mark was caused from liquid inside display, you just need to clean the screen from inside, unless it is an LCD.

You may ahev failing T-CON board, try having a small fan blowing at the vent on the back of the TV. If you can post pictures it will help a lot.
If you are going to DIY and have proper tools and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com

Why does my lcd proton Television have a long black streak on the right side of the screen?

my vizio made a popping noise and then screen went black. tv has power

A shadow of any kind showing up on a LCD TV is going to be a defective LCD panel. If not under warranty your replacement cost for the panel (if available) will far exceed replacing the TV with a new one.

Hiya. Replace C581, 10uf 250V electrolytic capacitor. Common problem on these.

the most common problem when the tv felt is the shadows all over the screen (maybe the tv didnt show it imm but looks like now is there the problem)
second:there is a circuit in the tv that works when the tv turns on every day. prevents the tv showing shadows on the screen.
the answer is this: if that system that prevents shadowing is working then the CRT is broken and say bye to the TV. But if the expert tech can make sure the D' gauss system is not working and can repair it then you get tv back.

Hi,
Seems convergence out IC is fried in TV so it gives blue shadow.

Check out Convergence Out IC which you need to replace in TV, if you have enough experience of repair of big TV, necessary tools and know basic electronics.

The drak Shadow mark I see on my Screen looks like the black soot like marks you see at the end of a flourescent tube. I think it is the back light.