Yellow spot in middle of screen (sony-large screen-hd)

That large purple spot is telling you that you bought a TV with a defective light engine. The problem will just get worse.

one of the three polarizers is burned up It can be repaired

A yellow area usually in the middle of the screen indicates a damaged optical light engine.

Hi my name is mani.i have hyline hd 66 projector..when I turn onn it has a very transparent or light brown spot in middle of the screen it dosent blocks the image.but colors are very light in that area..what causes that problem can anyone help me with this plzzzz.i would really appreciate it.

Thanks....

your optical block is failing. Sony has a program for replacing them if you want, or they will offer you a new TV. call this number 239-768-7604 and tell them what you TV's symptoms are and they will get you started

Hi there,
We have the same exact problem with the same TV. We've only replaced the bulb once about a year ago. Don't know if it had anything to do with the fact that we now have a large yellow circle in the middle of our screen, which is about 7" round.
We only noticed the yellow mark about 4 months ago.
Hopefully someone will have a solution for us that doesn't cost an arm and a leg. Paid $2100 for this set and are a little disappointed.

Sorry, but there is no cheap method of repair for this unless it is in warranty.

This TV will require replacement of the LCD Prism unit.

This Prism blocks and allows colors so that the 3 LCD images may be mixed to produce the final image you see on the screen. When this becomes damaged or defective, it leaks colors (light). This Color Leakage apears as spots on the screens.

Where you see the spots is where the specific spot on the prism that is leaking light, the specific color that is leaking also.

This parts cost alone is normally $500 to $1000 dollars but is usually replaced under warranty.

Good luck.....

It sounds like you have a bad Blue Polarizer in the light path. I'm sorry but that is something you will have to contact a service center for. It's not something you'll be able to do yourself, I'm sorry, but that's the best advice I can give you.

Possible dust in light engine? What ever you do, don't blow it out with the set on or hot. This easily equals instant death to bulb. 

I would suggest to try to get this TV fix while still under warranty. Normally the manufacturers give one year.
In regards to the discoloration, there is not much you do but to let the Sony authorized repair center knows about it so they can fix it. Ask them if their work is guarantee as well for how long.
Good Luck.