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The light tunnel has collapsed. Google "infocus light tunnel." You can glue it, as I did, but it tends to break again. From what I have read nobody has a good fix and the manufacturer has ignored the problem which has alienated a lot of customers. They won't even sell a replacement tunnel. Good luck!
check the lamp. if it has bulges, black spot, fogging, or flaking, or dust is clogging the side vent screen, replace the lamp. if the lamop is ok, check the colorwheel. if you hear a high-pitched whir, the wheel is ok. if you hear grinding or chirping or nothing at all, replace the colorwheel. if both are ok, replace the power supply. you can get parts from an infocus service center or send it to one for repair. either way, try av solutions in ny. they're really good. www.avsolutionsny.com
if you have the dp6150 (lcd projector), you have a lens or mirror out of alignment, or something obstructing the light from the inside. if you have a dlp projector (not the dp6150), the light tunnel has collapsed and needs to be replaced. you can get the part from an infocus service center (like av solutions in ny), or send it to them for repair. they're really good. www.avsolutionsny.com
is the led on the top of the projector blinkng at all? if there is no led lit, the fuse on the power supply may be blown or the power supply itself needs replacing. turn the projector on. you should hear the fans and a high-pitched whir. if you don't hear that whir or it sounds like a noisy motor, the colorwheel needs replacing. if it sounds good but no light, make sure you have the correct lamp. the x1a takes the sp-lamp-009 lamp. it should have 2 white wires, each at opposite ends of the plug. if you have a lamp with a red wire and a white wire, you have a lamp for an x2. also make sure the lamp door is closed completely. if the door is closed (hitting the switch), the lamp is correct, the led is green, and the sounds are good and it still does not light, the ballast is bad and needs replacing.
if the lamp is new, it could be the power supply (the ballast is built in to the ps). but make sure you have the right lamp. the X1 and X1a have an sp-lamp-019 and the similar X2 and X3 have an sp-lamp-018. the lamps are almost identical except for the wire configuration on the lamp plug. make sure the wires in the plug match the positions in the socket. also, when you turn it on, if you don't hear a high pitch squeal, the colorwheel is not working. and if that isn't working, the lamp won't either. also check to see if the lamp door is closing properly and hitting the switch at the top of the opening.
This is a very common issue with the Infocus projectors. Sounds like the mirror tunnel that sits right behind the Color Wheel and concentrates the light source onto the DLP chip. This tunnel which is shaped like a small prism is very fragile and can "fall apart" over time. Some have attempted to try and remove the tunnel and repair with limited success. Otherwise you may either need to send the unit in for repair or find a dealer who can order the part for you.
This is caused by a light tunnel fault, where infocus designed a stupid light tunnel using 4 pieces of mirror and some very tacky glue. What happens is that, over time the glue comes off causeing one of the pieces of mirro or more to collapse giving you the shaded effect on one part of the screen. I myself have had this problem and am now in need of a new light tunnel as mine literally broke, but here is a thread that tells you very efficiently (picture guided) on how to fix this problem. BUT be aware that you need a very good glue and something that will withstand the heat, thats where I went worng lol.