Why doesn't my Phillips Picopix display the green light anymore?

Why doesn't my Phillips Picopix display the green light anymore?

Hi. I bought this very compact pocket projector some months ago, and it worked fine. But one day I turned it on and the image was all yellow-ish. I believe those projectors use three light colors: red, green and blue, so I looked at the image carefully, and indeed noticed that everything that should have been green was a dark, undefined color.

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