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If it is Sony Grand WEGA KDF-42WE655 tv then it seems time to replace lamp in tv to solve this issue. When did you replaced lamp in tv last time? If lamp has not been replaced in 2-3 years then replace it to fix tv problem. Lamp replacement procedure is easy and written in user manual, please buy Sony original lamp from nearest Sony store for good picture in tv. Thanks.
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 Sony LCD Rear Projection TV - Optical Block Problems http://splinke.googlepages.com/sonyrearprojectionlcdtv-opticalblock