Projector problem The projector in one of my classrooms does not show the color blue.

there are 3 LCD panels in the projector.
red panel,green panel and blue panel
I seems that the red panel is failing
We supply original projector lamp,bulb,parts,Lcd panel,Lens,DMD chip,color wheel,motherboard,powersupply,ballast... with high quality and competitive price.
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have a nice day!
Jerry,Lampdeng Limited

An image is produced in these projectors by passing color through three different LCD panels. One is a Red, one a blue, and the last one a purple. It sounds like the green panel is damaged. The only way to tell is to take it to an Epson authorized service center.

the light is blerry ,
Pls check the lamp,(if it is bright enough )
check the color if it is correct and brite-colored (if the LCD panels is work well)
Have a nice day!
We supply original projector parts: lamp, bulb, Lcd panel, Lens, DMD chip, color

wheel,
motherboard, powersupply ... with high quality and competitive price.
Lampdeng Limited
Jerry

The temperature in the classroom is to hot. Turn down the
temperature in the classroom or get a small fan and place it near the
projector. The projector is running at border line and just needs a few
degrees of cooling...

It's not the adapter because if it was that one, the picture wouldn't show up at all or some colors would be missing, something like that.
You can try to adjust the brightness on the external display. I'm not quite sure how to this, but if you don't know how to do it post a comment here and I will get back to you with instructions.

change your vga cable...

THE DRIVER FOR THE PROJECT OR THE INSTALLATIONAL SOFTWARE MAYBE USEFUL

it's the light polarizer on the blue lcd panel. it's fried due to excessive dust and heat. unfortunately you'll have to replace the optical engine.

Could be a bit of dust or fuzz inside of the lens element or by the DLP chip. The first order of business is to remove the lamp and look at the condition inside the projector. If it is, as I suspect, very dusty as no doubt the classroom is a very common "dusty" environment, then you may have some cleaning to do. Be careful not to try and blow out the unit too forcefully as this can damage some of the internal components and could force the dust further into the unit. It is always better to gently swab out the interior or use an electronics vac instead of a blower.