SOURCE: Dark Blotch on rear projection TV screen
usually these are caused by cleaning the screen with a damp cloth or fkuid rear projection tv's usually have two plastic screens separated by about quarter inch with bulbs between,one being a magnified screen.problem is,condensation can occur causing various blotches,letting the screens naturly dry out usually solves this but failing this you have to strip down and wipe them with clean dry cloth.be careful though the inside screen is very delicate.
SOURCE: Gray spots on screen on a JVC HDILA model HD 56G 787
Spots on the screen/picture can be caused by three things. Dust on the inside of the screen, on the mirror or in the light engine or optical block. The first two can be corrected by you if you can gain access to the interior. If it is the third (light engine. it will require a technician. If this answered your question, please be sure to rate the answer. Thanks!
SOURCE: Gray spots on screen on a JVC HDILA model HD 56G 787
The HD-ila sets accumulate a lot of dust in the light engine. The worst offender is the little fold mirror just under the lens. I take my set apart about every 8 months or so to clean all the dust from the light tunnel and all lenses, mirrors, diffusers etc. The picture really regains it's pop when this is done. Unless you are a skilled technician though, I would recommend against attemptimg this procedure as you need to disconnect the individual color lcds. Check with a local service center to get it properly cleaned.
SOURCE: I have a 56" JVC rear projections HD ILA tv.
Turn tv off and unplug it. Take the access door off either side of the tv. Use a dust cleaning tool like a swiffer with an extension (or make one). Clean off lens (most likely the problem). I have the same thing that happens to my JVC 61". You can use a vacuum with extension if your VERY careful.
SOURCE: Having a big yellow spot background in the middle of the picture.
Hi , it seems you are experimenting a light engine problem.Here's how your tv works: http://www.youtube.com/watch?v=ZLLHnQ4y-wo Basically there's 3 LCD chips that create the colors and image by blending together.When these chips start to melt you will get those blue spots, pixilation even vertical lines.You will need to replace the light engine. Have a blessed one!
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