Dark spot on nec lt35 projector

1,white spots appeared on screen,means the DMD chip is broken,you need a new DMD chip.
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Lampdeng Limited

A plastic prism between the lens and the lamp is melted. can't find part no. PLNS-A056WJN2

The red lcd panel or the mirror(s) in the red optical path may have broken.

if the spot is circular, check the lamp itself. if it has a flatter edge, chances are your light tunnel has collapsed and needs replaceing. it's not that old, so dell might repair it. but they might replace the entire optical engine, as they may not sell individual parts.

If by saying the upper right corner of the lens you really mean that there is a dark spot on each image AND the rear display, there may be dirt or dust on the lens itself. Clean the lens with an optical quality cleaner. Do not use paper towels and Windex or the like - as paper towels can scratch the lens.

It is also possible that the dark spot is a "stuck pixel" on the image sensor inside the camera. There is no way to repair a stuck pixel outside of replacing the sensor. Any dark spot (regardless of source) can be edited out by using image editing software. This will allow you to to make the dark spot less noticeable - or practically invisible.

If the dark spot is on the rear display only, it can also be a result of a "stuck pixel" on the display itself. This should not show up an images, but only on the display. There is little that can be done outside of replacing the entire rear screen.

There are other things that can cause these problems, but those listed above are the most common.

I hope this was Very Helpful and good luck!

if you can focus the lens on them, they're on the optics somewhere. if you cannot, you may need to replace the fly-eye (diffuser) lens. they tend to fry due to excessive dust and heat.

LCD projector 101, your blue device is dying inside of projector. Consider purchasing a dlp based product, they do not suffer from color decay.

Really you are blessed , most lcds last about 3-4000 hours or 4 lamp changes. good luck

replace the bulb

If you're trying to project video, then the unit needs professional service. If you're trying to project from a computer, you may have a loose display cable, broken pins in one or both ends of the display cable, or broken conductors (wires) within the display cable. The computer sends its image information as a template of RED image components, GREEN image components and BLUE image components with the projector overlays to create the complete image with blended color values. (The computer also sends HORIZONTAL and VERTICAL synchronization signals, but those don'e affect the color content of the projected image.) That's why I'm suspicious of the display cable, conductors or pins.

you may have touched the bulb while changing it and minute traces of skin oil are on the actual bulb, with the machine cold, try and very carefully clean the bulb