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Topic: Hi, I repair projectors and will answer questions!
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Joined: Aug 23, 2022
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Hello all,

I am posting this here since you are the color specialists and might know why my projector is doing this. For some reason I have a weird green effect. It seems that the projector replaces black with green and other colors are washed out and missing one specific tint. I cannot figure out what it is because it is displaying white normal which I think is weired. Here is an example of an image and how it is projected (attached). What can be the problem?

I have tried disconnecting one color at a time, but if I do that the whites are not displayed correctly. Only when all the LCDs are connected, I get a normal white.

Do you thing there is something wrong in the color channel of the LCD assembly? What can it be?

Thanks in advance for your answers.

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Quote (malebuffy on Aug 23, 2022 12:29 PM):
Hello all,

I am posting this here since you are the color specialists and might know why my projector is doing this. For some reason I have a weird green effect. It seems that the projector replaces black with green and other colors are washed out and missing one specific tint. I cannot figure out what it is because it is displaying white normal which I think is weired. Here is an example of an image and how it is projected (attached). What can be the problem?

I have tried disconnecting one color at a time, but if I do that the whites are not displayed correctly. Only when all the LCDs are connected, I get a normal white.

Do you thing there is something wrong in the color channel of the LCD assembly? What can it be?

Thanks in advance for your answers.

First rule of asking a question: Make and model of the projector in use.

I expect that the green channel has something going on with it. Perhaps a degraded LCD panel that can't go completely black.
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 Aug 24, 2022 4:23 AM):
First rule of asking a question: Make and model of the projector in use.

I expect that the green channel has something going on with it. Perhaps a degraded LCD panel that can't go completely black.

Sorry you are right, Epson EH-TW6700W
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Quote (malebuffy on Aug 24, 2022 1:47 PM):
Sorry you are right, Epson EH-TW6700W

With it being a relatively new model, I struggle to expect it to be a failed polarizer. It is more likely a issue with a ribbon cable or similar. Unfortunately, FixItFrank really doesn't visit these forums that often, so you are better asking him directly on his YouTube channel or he does more interaction on Reddit.

The USA version of this model is the 3100. I wish they would stop giving US and EU versions different model names.
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 for mentioning the USA model. Might find more info on the projector.

In the meantime I made a test disconnecting all 3 lcd colors (R, G, B)

I still have a red screen, which basically tells me that for some reason the green light travels through the beam without anything blocking it. The other two colors obviously get blocked, the green not.

Is this kind of a polarizer in-out issue? Or what should actually block light to mix colors?

Any clues?
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