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Topic: Top left of projector slowly going black
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Joined: Nov 29, 2013
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Hi everyone,

Two weeks ago, my projector was running just perfect. Then one day, when I started it in the morning, the top left corner was black. And I'm pretty sure it is slowly spreading. You can understand what I mean in the image attach to the post. And If you look carefully you will see the all of the top is beginning to fading in black. Is that a common issue ? Is there a way to clean my projector before it stops working or is this a piece that need to be change?

Thanks a lot in advance!

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Projector_Image

362 × 482 pixels (7.10 KB)
  
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Joined: Mar 28, 2005
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Looks like a collapsing light tunnel perhaps.

The lamp won't cause this issue, and since everything else seems to be okay, then pulling the projector apart and attempting a repair on the light tunnel is about the only option.

Since I've never done this myself, you may want to search YouTube for light tunnel repair videos to get an idea of what I am talking about. And yes, I'm very much guessing, but it is based upon my years here and reading of issues with projectors.

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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Thanks AV_Integrated ! I'll try that soon enough and I'll post my work here so that if someone has the same trouble he knows what to do.
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Quote (G4bb on Dec 2, 2013 5:16 AM):
Thanks AV_Integrated ! I'll try that soon enough and I'll post my work here so that if someone has the same trouble he knows what to do.


Yeah I agree with AV. The light tunnel has collapsed. Depending on the model of projector and how good your skills are it can be fixed. Once you get to the light tunnel(which can be a pain) you will notice 4 small mirrors about a quarter inch wide and about an inch long. It's located right after the color wheel. More than likely one of the mirrors will be slightly skewed. The glue has failed is what causes this. The light tunnel needs to make a perfect square tunnel. You will need to glue it back together. The only glue I could find that had a high heat rating was JB Weld.

It's a pain to hold the mirrors perfectly straight as there is no guides or grooves or anything like that to hold it in place. I once was able to use tape and then apply the JB Weld but I must have gotten lucky cause I wasn't able to do it again. I ended up taking a small piece of metal and filing it down to the correct size. Then I could put each piece of the light tunnel around the square peg (for lack of a better discription),tape it to hold, then use the JB Weld to finish it. After it dried, you can use a razor blade and clean up the JB Weld. I've done done this several times and I have never gotten one back. You could probably use a piece of wood to make the square peg.


Good luck.