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Topic: Optoma HD6720 lens flare and dust issue
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Joined: Apr 11, 2019
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Hi there,

I am new here and first off let me thank you for accepting my registration request.

I have an Optoma HD6720 that is projecting some sort of lens flare on the bottom right of the screen.
It is usually where the black bars are. I don't really know what the nature of the issue could be and not quite sure how to describe it, hence please take a look at the attached pictures.

That weird lens flare stays still constantly.


Also, when the projector is completely OUT of focus, I can spot more or less in that area (slightly above) what seems to be some sort of dirt. I may be wrong, but it looks like a piece of tobacco, or something similar (please check out video below).

https://www.youtube.com/watch?v=abjazQBc4uI

When the projector is set up to be sharp and in focus, that little piece of "dirt" almost disappears. It becomes so shallow and blurry that it is noticeable only if knowing the issue. It becomes a larger slightly darker area of the screen.

Can the two things be related?

Is it anything serious?

Thank you very much

Attachments:

Lens Flare

1421 × 1094 pixels (153.68 KB)
  
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Joined: Mar 28, 2005
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Dirt or dust in the optical path is typical if you are able to bring it into focus by adjusting the lens. This can sometimes be corrected by blowing some air into the optics, but this may cause even more dust to accumulate. Unfortunately, this means that there is no guarantee of success, and a chance to make things worse if doing it this way. Better is the long, tedious process of taking the lens apart, cleaning the optics with proper lens cleaner, and reassembling everything - and doing so in a manner in which you don't harm a single thing or get more dust into the system. So, once again, not a task for those who aren't prepared to dive in.

The lens issue may just be an issue. I'm not sure if that's new for you, if it is an indication of a problem with the optical block, or if something else is going on. If this is a 'new' issue, that you've never seen before, then it could be something that has slipped in the optical block, or it could be debris in the path. In reality, there are any number of causes for this type of problem.

At the end of the day, this projector is somewhere between about 5 to 10 years old. It may be towards the end of it's useful life, and showing the signs of aging that come with projection at that age.

It certainly isn't worth sending out to have repaired, but if you dive into it on your own, then you really want to take your time and be cautious in the process so that it doesn't come out worse than when you started.

No, I haven't taken a projector apart and put it back together on my own to any real degree. So, I can't be of specific help to the internal operation and assembly for you here. Do so at your own risk and good luck.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Quote (AV_Integrated on Apr 12, 2019 7:49 AM):
Dirt or dust in the optical path is typical if you are able to bring it into focus by adjusting the lens. This can sometimes be corrected by blowing some air into the optics, but this may cause even more dust to accumulate. Unfortunately, this means that there is no guarantee of success, and a chance to make things worse if doing it this way. Better is the long, tedious process of taking the lens apart, cleaning the optics with proper lens cleaner, and reassembling everything - and doing so in a manner in which you don't harm a single thing or get more dust into the system. So, once again, not a task for those who aren't prepared to dive in.

The lens issue may just be an issue. I'm not sure if that's new for you, if it is an indication of a problem with the optical block, or if something else is going on. If this is a 'new' issue, that you've never seen before, then it could be something that has slipped in the optical block, or it could be debris in the path. In reality, there are any number of causes for this type of problem.

At the end of the day, this projector is somewhere between about 5 to 10 years old. It may be towards the end of it's useful life, and showing the signs of aging that come with projection at that age.

It certainly isn't worth sending out to have repaired, but if you dive into it on your own, then you really want to take your time and be cautious in the process so that it doesn't come out worse than when you started.

No, I haven't taken a projector apart and put it back together on my own to any real degree. So, I can't be of specific help to the internal operation and assembly for you here. Do so at your own risk and good luck.


Thank you very much for your time.

So, according to your experience, the two are separate issues and even if I'd manage to clear up the dust, I most likely still would experience that weird lens flare issue.
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I would expect that to be the case, but I can't say 100% as actual internal work on projectors is not something I do personally. I have just been following different reports of issues over the years.

There is a good YouTube video on a complete breakdown and clean out of a Epson LCD projector that is worth viewing.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.