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The set if projection which model here is, has arced and now each of the three picture tubes used has a tiny permanent burn mark on its screen.
That is what you are seeing, the set uses three picture tubes with screens like the old tv sets===the coating has been burnt in each, want to prove it, remove rear cover and cover any one of the three lens and that mark on one tube will go a way.
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...........
optical engine failure. that technology is called DLP digital light processing and it uses a device called a DMD digital micomirror device that has millions of mirrors onthe face and they independtly move and sometimes they can get stuck or not move and cause spots black or white across the entire picture. i suggest calling customer support for possible repair accomodation
optical engine failure. that technology is called DLP digital light processing and it uses a device called a DMD digital micomirror device that has millions of mirrors onthe face and they independtly move and sometimes they can get stuck or not move and cause spots black or white across the entire picture. i suggest calling customer support for possible repair accomodation the cost of the optical engine is around $1100.00+tax plus labor for professional installation part number - 938P075040 phone # for mitsubishi 1(800)332-2119 good luck
If it is rear projection set, you may have a burnt tube; what happens in some models is a arcing may occur and it burns a spot in the center of the tube.
In this type of set there are 3 picture tubes (what is model number?) The way in this case to confirm this is remove the back and with the set turned on (BE CAREFUL!) YOU cover the three large lenses with a cloth one at a time----if one of the tubes is burnt when you cover that lens the spot in the center of the screen will not be seen.
If this damage is there it is permanent---the tube would have to be replaced AND WHATEVER ARCED WOULD HAVE TO BE FOUND AND CORRECTED.
go to this link and on the lower left side click on the contact link and leave the board number and they will respond right away that have access to rebuilt as well as new boards for all models and all boards rebuilt are guaranteed. http://servicemanuals.vstore.ca/