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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.
Thats caused by a bad optical block. The cost of that repair will almost always be greater than replacing the TV.Thats a very common issue with alot of Sony DLP models which suffered that optical block issue with the blobs of color usually blue or green
Can you still see the spot when the TV is off? In any event, the screen may have something on it or the mirror that reflects the image from the projector where the bulb is. Make sure the projector bulbs are clean. Good luck, thanks for using FixYa.
First, look for the source of the problem. Large speakers, especially
older ones, are the most common offenders. Notice the position of the blue spot on the screen (left, right, upper, lower, etc.) for an
indication of which direction the magnetic field is coming from.
If you think you have determined the source of the magnetic field, try
moving the object away from the television screen. If this does not
work, continue looking for other potential causes.
f you are unable to determine what is causing the magnetic field, try
moving the television. Sometimes magnetic interference can come from a
neighbor's equipment, especially in apartments and condos. Moving the
television to another part of the room, away from shared walls, may
If none of these techniques succeeds in removing or improving the
appearance of the blue spot, try to find if their is any demagnetizing coil button available in front of the TV panel , it may be symbol like magnet and a diagonal line on it
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/