Check the optical block repair at sony's warranty website...
Could be the problem they have been covering it under a recall of sorts. $1250 for the optical block and they are only doing it until the end of the year so don't waste any time
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if you see blue pixel type groups of squares or dots you may have a burnt light engine and this is common in many LCD rear projection sets; a blue screen may mean the engine became burnt--LCD rear projection sets of this kind have an optical enginge--with red,green,blue prizims--sometimes they get burned by the lamp---a photo would tell me or most techs what the problem is---the cost of a replacement engine is very expensive--some models with this problem are covered by Sony even if the set is no longer in warrant
This set has no internal manual adjustments for color. The Tracking or B&W balance is accessed via the service menu. I don't suggest you attempt to adjust without instrumentation. the trouble with your set is not an adjustment. Most likely the Optics are at fault. This model has had issues with filters in the optics being destroyed over time by the lamp. The blue haze will get worse and continue to grow over the whole picture. The only option is to remove the Optics (light engine) and sent it out to be rebuilt.
You most likely have a bad optical block. The blue dots are a pretty good indication of this. Sony has extended the warranty of some of their models to include an extension on the optical block replacement. I don't recognize your model number (Not a US model?) so you will have to check with Sony in your country to see if your set is covered. Please be sure to rate this solution. Thanks!
This is a known defect and Sony will replace the optical block (the main imaging unit in the set) under Warranty - even if the set is out of warranty. Contact Sony support web site for assistance on ho to get this repaired.
There is a possibility that the symptoms that you described is covered under an additional warranty, even if your set has been out of warranty for years.
Sony has a site that describes this repair at no cost to the consumer:
If this is not covered, then, the blue light panel is going out and that means it needs a light engine.