Epson EX 5200 image goes Yellow if not tilted

Oct 14, 2018
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Hello, I recently purchased a used projector. It's an epson ex5200. It seems like when the projector is stable and forward, the whole image has a yellow tint to it. If I tilt the projector on its side, you can hear something inside move and the image becomes normal. I'm completely new to projectors. Not sure what the issue is.