Green screen projection
This is the exact same issue as I described for an Epson user. So I'll repeat it here.
I assume this is an LCD. I don't remember the s4 being a DLP projector.
This
sounds like the LCD panel used for the green color has gone out. The
image is made up of red, green and blue images layered upon the screen.
If the green panel has gone out then there is nothing filtering out the
green light in the image. This causes a nice green hue to the whole screen.
It
could be a simple open and reconnect fix. I personally have never
opened a projector, so I'm not going to walk you through it as I do not
know how hard it would be to tinker with. It should eb a cheap fix for
a true repair man though.
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