I had same problem so i opened up the casing of the projector and blew the dust off the inside components. it has been two days without the problem and the picture quality is better. probably an overheating problem due to all the dust. just be careful when taking it apart because there are a few cables to disconnect and a bunch of hidden screws, if it's still under warranty or you don't feel confident taking it apart, i'd send it in to get fixed.
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In response to the same problem another person had I've given a self-repair suggestion which can be found here by using the search phrase- Blue tint on projector or by clicking my name and the appropriate topic.
I have the same issue, I have figured out its a fan issue, my fan must have went out. After about ten minutes the bulb will get too hot and the picture will start to turn a way off tint color. I put a fan on my projector and after about 40 min. the picture returned to the appropriate color. I am still investigation on how to get and replace the fan.
Your best bet on getting your hands on a Service Manual would be to contact Optoma themself.
As for changing the colour wheel , it is pretty straight forward if you were able to open up the unit and get to it.
The colourwheel is mounted with three tiny scrws to a bracket in which it sits. And the bracket in it's turn is fastenend to the body of the Projector with two tiny screws.
First unscrew the bracket from the casing of the Projector and then take off the three screws that holds the Colour wheel to the bracket. Replace and do the whole proses again - but obviously just the other way round.
This is really easy to do yourself.
Give me a shout if you need any further assistance.