42" SONY LCD TV. LARGE

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

Not possible.Tv have damages to it LCD screen panel by an object or a person have causes by forced or putting pressure to the tv LCD screen panel itself to causing colors picture pixels and it radiation to died to causing this problems.Sorry it time to buy a new tv,because by replacing the tv LCD screen panel itself will cost u the same as a new tv.Tries buy a new tv from the VIZIO tv corporation directly return the damages LCD panel tv to them,u could get a 5 or 10% off of the tv prices.

Blue blotches spreading over the screen are failure of the optical block

contact Sony to see if you are eligable for a free repair.

Sony will cover the cost of the optical block repair (parts and labor) at no charge through December 31, 2008 for 2004 Model Year Grand WEGA™ Televisions with the blue spot problem.

Models: KDF-42WE655, KDF-50WE655, KDF-55WF655, KDF-60WF655, KDF-55XS955, KDF-60XS955, KF-42WE620, and KF-50WE620

http://esupport.sony.com/US/perl/news-item.pl?news_id=
Read more: Help from Sony for LCD rear projection with blue spots - Home Theater Forum - Home Theater Systems - HomeTheaterShack.com http://www.hometheatershack.com/forums/sony/5351-help-sony-lcd-rear-projection-blue-spots.html#ixzz0gm8a3718

Don't bedeterred by the dating of this announcement, it is a manufacturing fault and they have been pr5etty good to a lot of people with the same problem.

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Hi,
I'm afraid, it is problem of optics unit block (light engine), there are 3 LCDs red-green-blue for color picture formation and blue LCD sounds bad, please call local TV tech for fix.
Thanks.

sony canada is replacing the color block on all of the 2006 2007 model year of the Grand wega

Hi
sounds like you have colour impurity problems caused by a magnetic feild being near the Screen. Fist check for any new magnetic feilds nearby. If there have been no new changes, it may also be a faulty PTC device that automatically degausses the tube. When they fail, you will get problems with impurities by way of coloured spots on the screen.
Try disconnecting the set off at the wall for 30 mins, this will initiates the auto degauss process. If all is ok, the spots will be gone. If not, you will need to have someone handy with a soldering iron that is also familiar with TV repair to replace the PTC for you.

Please rate this solution. Happy to answer any other questions you may have. Cheers.
regards robotek

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.....

Uh Oh! blue screen of death. Your light engine has warped a little from overheating and is distorting the picture.

My suggestion to you is to get on the phone with Sony and start complaining, then keep complaining until they agree to pay for it. Even if it is out of warranty.
You may have to get the problem diagnosed by a pro before they agree to pay for it though.
Hope ya fix it!

If these are oth LCD projection have them looked at. The light engine will need to be relaced and has an extended warranty on some models for this case. Call Sony with the serial and model to verify and they can tell you in your area who is a qualified Sony servicer. Circuit City can handle these if they are covered by the light engine warranty.

your unit needs the optical engine cleaned(the lcd panels).This should cost about 300 at a local tv shop