Why is there a discoloration to my screen BLUE HUE AND YELLOW IN THE CENTER

SOURCE: RCA 52" HDTV Rear Projection TV MM52110JX1

Replace FL231 400ma fuse. this will fix your problem.

SOURCE: Hitachi lcd projection tv screen discoloration model 50vs69a

probabally a dust spot on the mirror or the lcd mini panels inside the optical engine.
must be dissembeled to clean.
not for the faint of heart.

SOURCE: hitachi ultravision digital 65

my tv is green the colors say that there 100 percent but the yellow is at 0 does that mean i need a new lamp, bulb or what?

SOURCE: We have blue lines or arches on the bottom and top

if you are handy with screw driver i suggest you remove all cd,dvd or anything you got on top of the unit and remove the back panel from this tv after you unplug the unit of course .first thing you want to do is clean your lenses most time dirt ,bugs,etc and other materials get logged on the lenses also make sure you dont spray directly any cleaning product on the lens make sure you spray a rag or some sort of cleaning towel.
after you finished doing this clean the front panel as well were screen is also clean the silver board thats in there as well.after you finish all of this replace all of the screws and boards back on and give it little while to dry off .turn it on see if u still have the lines if you do then your problem lies in the lenses they might be cracked.
if there not you might have bad electrode or power diode going bad.

SOURCE: convergence panasonic HDTV 1080i bbe hi definition

The most likely cause is shorted convergence chips and possibly a few pico fuses.

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony,Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer Hitachi,Mitsubishi,Zenith and others.
You can get a convergenece repair kit with instructions from the links below.

Here are some of the most common problems with these sets...

Problem #1) Convergence

Yours may have one or more of the following symptoms...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2
Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

You can see some more examples and find a fix herehttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull