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Topic: anyone seen this? Projection dim at the top but ok near the bottom
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Joined: Feb 18, 2024
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this is a benq that had a burst colour wheel. it had all the issues assosciated with this. i took apart, and replaced the wheel. the projector now no longer has those issues (ie flickering, flashing, trembling sort of effect) and appears to be projecting a solid image, but the light is perfect at the bottom and increasing dim to the top. there is also a spill of light (not in this pic) throwing out to the top right beyond the actual image.

has anyone any idea whats going on here? i changed the ballast to a new ballast - same effect. i replaced the wheel sensor. same effect. i took it apart and reassembled - same. it almost looks like an optical engine thing but i never touched that. also replaced the bulb - same effect.

i would appreciate any feedback if anyone has any insights, much appreciated..

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dim projection at top and ok at bottom

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Joined: Mar 28, 2005
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Looks like the light tunnel has collapsed.

Please refer to the Fix It Frank videos on YouTube for some repair examples for this problem.

Shadowing across the image from a DLP projector is most typically associated with a collapsed color wheel.

www.youtube.com/fixitfrank
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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Joined: Feb 18, 2024
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Quote (AV_Integrated on Feb 19, 2024 7:06 AM):
Looks like the light tunnel has collapsed.

Please refer to the Fix It Frank videos on YouTube for some repair examples for this problem.

Shadowing across the image from a DLP projector is most typically associated with a collapsed color wheel.

www.youtube.com/fixitfrank

thanks for this, ill take a look at it!