Hitachi dlp - 52" . neon blobs

Failing optical block. check this website
http://sites.google.com/site/sonylcdrptvproblems/sonykdf-55wf655opticalblockreplacement

there is not alot you can do yourself

I have the same tv and the same problem, but my yellow is a cloud around the outside of the screen. My tv was recently moved, and a repair shop told me that sometimes in a move these tvs light engine takes a shock and causes a yellow "band" on the screen. I am hearing that these light engines are not cheap either. Hope this helps you.

you most likely have a bad light engine.

CALL HITACHI THEY MIGHT HELP WITH REPAIR, HAS A BAD OPTIC BLOCK.

Took the TV to the shop...there I learned that the obtical engine assambly has been a pain on this type of TV. The repairer suggested on calling the company and to compliant about it, since there seems to be a known problem with that assambly. The company will send the part ($900.00 cost) to the shop and all I have to pay is for the remove and instalation of the assambly.

If you have the "red" blob in the center of the screen or you have "blue" blobs that show up in random areas of the picture then the only repair is to have a technician replace the optical light engine.

Sharp Factory rep told us that it would cost more to fix it than replace it. SO that is what we are going to do.

Sounds like you LCD has gone bad... Its like a calculator LCD when you press down on the screen of it it get like a blob. My projector also has done this... Half of the screen is all blue

To all that are experiencing the blue blob. This is result of poor maintenance. Projectors must be kept clean on all air intakes. This is to help you all understand the failure cause. Usally not worth repairing.