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Re: yellow smudge on screen sony wega
Its another instance of the optical block (light engine) failure these TVs are known for. Heat from the lamp has damaged the LCD panels in the light engine. Sony has been directed by the attorney general's office in New York to warranty these TVs going back 4 model years. Call Sony at: 1-800-222-SONY for assistance.
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The model indicated here Sony Grand WEGA KDF-50WE655 is a LCD rear projection and rarely if ever requires cleaning.
If black spots or such are gradually appearing the issue on this model is the optical light engine.
Set uses a LCD engine which the lamp shines directly into and heat from that very hot lamp can damage sensitive baffles inside the engine.
I would suggest also you contact Sony as they have on several models extended the warranty for this kind of issue---Engine is very expensive part and several of these Sony sets were involved in a class action lawsuit--hence they are dealing with them.
Do not take no for an answer if you want them to help you---the hinge that is sqeeks gets oiled...........
You did the right thing with the bulb. The current problem is something different altogether. My guess is that your TV is 2 plus years old. The Grand Wega has an inherrent latent defect, which Sony is not acknowledging or taking resposablity for, in that the optic block distorts after a certain number hours of use. I am curretly working to get an equittable resolution but Sony is stonewalling - would like to get a class action going for the KDF. To learn more Goggle MSNBC " Problems with Sony Gran Wega "
Sony wega blue dot or star pattern on screen http://esupport.sony.com/perl/news-item.pl?news_id=206&mdl=KDF42WE655 Models: KDF-42WE655, KDF-50WE655, KDF-55WF655, KDF-60WF655, KDF-55XS955, KDF-60XS955, KF-42WE620, and KF-50WE620