Have a JVC HD-Z886 61inch, there appears to be some black spots behind the screen. Looks like dust, most at top of screen, not a big problem. Is there any way to clean behind the screen? When new the TV arrived with the screen not secured at the top, later had to have repair correctly attach top of screen to back of unit, possible dust entered at that point???

Make sure the projector lenses are clean and also the interior of the screen.

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Howdy;
Yes there is a way. The easiest for you would be to remove the back top of the TV. That will give acess to opt lense and mirror. But first check the Lamp and inspect the lense that the Lamp into. It does not take a lot to cause your concern. Use super soft cloth and wipe surfaces.

Good Luck,Big Irish.

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.

I believe those objects are really black, and always there, Maybe they are no so big as they look, but the projection make them looks that big. some times the plastic use in the manufacturing is not cleaned and those plastics felt in the lenses, being positive. an expert can decide if it is just and object or anything else.

There are several things that could be causing this. Dust or foreign matter on the inside of the screen, dust or foreign matter on the reflecting mirror or dust in the optical block or light engine. The first two can be fixed by you if you can gain access to the interior. The third will require a technician. If you have had your question answered, please be sure to rate the solution. Thanks!

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.

The gray spots are caused by dust on your lens, very easy to clean.

Power down the TV.

If you open the right side access panel (right side as you are looking at the front of the TV) you can see it in the middle, it's not very big. Using a scratch/lint free cloth, gently wipe off the lens or use a vacuum to **** up the dust being careful not to actually touch the lens.

Replace the access panel and enjoy your spot free screen.

I fixed it!!!! If you can open one of the sides (on the JVC there is a little door with a screw), then you can clean the projector lense in the middle on the bottom. It kind of looks like a big light bulb. It seems there is just dust on the glass that is projected onto the screen. We had a big gray spot and cleaned it with a damp glass cloth and Ouila! It disappeared. I scored MAJOR brownie points with my husband for this one! He wanted to replace the TV!

I assume you are talking about a coaxial connector? If that is the case then you could use a vcr to plug the coaxial cable into then output from the vcr with composite/rca and that will plug into your converter.
Hope that helps.
Thank you,
Lee

This is probably caused by dust, either on the mirror, lens, or possibly inside the light engine. There is a 5" dia hole on the side of the back of the tv where you can take out one screw and take the door off. this is just big enough for you to put your hand through to clean the mirror and lens. Hope this helps.