I have an optoma gt720 projector that has been working great for the last 6 months or so. Last night, for no reason, the screen went almost completely dark. The lamp is still working, the warning light is not on, so I assume that I can rule out the lamp burning out, but the projection is barely noticeable even in a dark room. The left side of the screen is slightly more illuminated but it is nothing but a dim blur. I use this projector as a computer monitor/ television and I do not have a backup for either, so waiting weeks for a factory repair is not an attractive option. Is this anything that I would be able to solve? Thanks

SOURCE: Optoma MovieTime: The Lamp that Won't stay on

its definitly a cooling issue.the temp sensor is working because it shuts the unit down.when a lamp goes it goes just like a light bulb.you can open up the unit and locate the fan take it out and go to a radio shack a match it up to a universal fan.

SOURCE: Blub brightness has dimmed.

Hi,

Replace the Lamp unit is the best solution. that will cost you around $450.

Viren

SOURCE: blurring

Check if it is not the same problem as http://www.fixya.com/support/t401456-infocus_x3_video_problem

SOURCE: optoma projector switches off after 5 mins

AS regretable as this sounds component failiure was my first thought .. It's not the bulb temp sensor as the fan is opperating and that usually cuts all power .
You may find that as you have a bulb ( usually worth more than the units they reside in ) rather than a repair another unit of Ebay would be a safer and more economic conclusion ... Regards Vortash

SOURCE: optoma DX605 hard reset

Have you tried going to Menu>Options>Lamp Settings>Lamp Reset>Yes?

Hope this helps!!