Mitsubishi HC7800 - light leakage issue - AVS Forum
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post #1 of 7 Old 10-02-2012, 07:20 AM - Thread Starter
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hi guys,

I just got my first projector just few days ago, and there seems to be a huge light leak below the 16:9 movie image (see photos, I put a paper in front of the lens to show it).





Do you think I can fix it myself or need to take it back to the shop (would be a big hassle)? Or it is normal for projectors?

BTW I mount it upside down not sure if that is the cause.

Thanks for your advice in advance.

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post #2 of 7 Old 10-03-2012, 05:28 PM
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You'd be surprised at how many projectors have a similar issue with light leakage. What I would do is mount the projector or just place it on a shelf if you don't want to go through the hassle of mounting for testing purposes and see if it's actually visible during a movie in a darkened room. Like I said, many projectors have a similar issue and the manufacturer realizes this but doesn't do anything about it because it's not visible in real world scenarios. If it's visible in a dark room return it for a new unit. From the looks of the photo the light leakage is far away from the actual projected image, so I doubt you'd be able to see it during normal viewing unless you're projecting on a gloss white wall with everything else being white as well.
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post #3 of 7 Old 10-03-2012, 08:53 PM
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On the Mits hc4000, some people fixed it by adding a filler (I think with a washer or something similar) where the light was leaking.
I do not remember where the post was, but if you search for "light home depot" in the Mits hc4000 thread, or something like that, I think you might find how he did it.


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post #4 of 7 Old 10-04-2012, 10:46 AM - Thread Starter
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thanks guys for your feedback.

the light leak on mine is quite visible right at the level of my head, that's how i came to notice it in the first place. if i raise my hand or leg during the movie, it will be lighted up which is annoying. the rest of the time i can see the shadow of my head casted on a cushion if i hold one during the movie.

I cant find the hc4000 filler mod posts, give up.

Mitsubishi sent a technician to check mine today. he said the leak is normal due to the design of the DLP chip. he has arranged for a new unit to be delivered to me and let me choose a better one between the two, but he has warned me that the new unit might be even worse so it might just be a waste of my time after all.

cheers
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post #5 of 7 Old 10-04-2012, 10:55 AM
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Use some felt or anything, just experiment, it shouldn't be that hard to stop the leak.


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post #6 of 7 Old 10-04-2012, 11:02 AM - Thread Starter
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Quote:
Originally Posted by coderguy View Post

Use some felt or anything, just experiment, it shouldn't be that hard to stop the leak.

i can sort of fix it by taping a black cardboard in front of the lens but it is an ugly DIY fix and i cannot quite accept such a design flaw to be "normal" with a brand new $3000 projector...
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post #7 of 7 Old 10-04-2012, 12:45 PM
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Believe me, that had to be done a lot in the early days of digital HT projectors. Its not such a bad fix but you should get your hands of light absorbing fuzzy used to line the inside of telescope barrels. You can find it on line and buy a small piece. You want to keep the spilled light from bouncing back onto the lens.

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