After about 45 minutes the picture changes into a blueish tint. It seems like no other colors are showing except various shades of blue that make up the picture. The picture is not distorter in any way, the colors are just off. If I wait for a day, for instance, and then turn back on the projector and play something, it will play fine but then turn blue again after around 30-35 minutes. My bulb is on 1000 hours.
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Since this is a 3LCD type system, I believe the blue organic filter polarizer glass plate that filters the blue light beam before it enters the blue LCD panel is burnt due to old age and causing the picture to go blue.
You can confirm this if you safey remove the cover and check the optics.
From your description, it sounds like a problem with the blue color. Green LCD=purple onscreen, Red=cyan(baby blue) onscreen, Blue LCD=yellow onscreen. It could be a lot of dust on the blue lcd panel, or worse, might be a burned polarizer filter behind the lcd panel due to excessive heat. If you can focus on the yellow and its tons of yellow specs, its dust. A burned filter however, must be replaced. A technician trained in projectors will have to do it. The filter material is glued to a thin glass panel and is replaced as a single filter. It's a very involved repair.
Youve probably got something gone wrong with your dlp chip with the million mirrors on it, see when the mirror tilts away from the light you get a black shade- tilted toward light lighter shade now throw the color wheel in which gives you color youve got green and blue so the color wheel is fine. Now how to replace chip? Dont. Look for a digital board or video board replace that and that should take care of ya. Good luck hope this helped ya-
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.
lcp panels will look different when going bad !
this is the polarization filter, most of the time the one BEFORE the lcd panel (blue in this case).
these should be cheap but are not easy to get...so you might pay quite a lot.
you can also buy polarization filter sheets and cut them to size.
keep in mind to check for the right orientation !
I just saw your post & today is Mar 19,2008. I had the same problem and was pissed until I noticed YAMAHA has a good warranty, so I sent it back and they put in NEW OPTICS that are non-organic (I guess the original ones were organic) NOW my picture is much better than when it was new. This picture is so clear I can not believe it.