Darkened band about 1 inch wide down the left side of the screen.
The complete image is there, but just darkened in that band.
Since the optics are rotated, I suspect that something has slipped down between the lamp and the imaging surface. I removed the lamp, but could see nothing from the (limited) view offered.
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Ok I guess you have an optical mirror chamber error sounds good doesnt it but can happen if projector has been knocked or dropped in the optical engine there is a chamber connected in between the main lamp and internal glass lens you may see it if you look inside the lamp assembly this very small chamber has four very small mirrors in it and is held in place usually by a metal plate bracket you may find one of the mirrors has moved or dropped this makes the refraction of light incorrect which will cause your dark shadow on your image screen
It almost sounds like a bad LCD inverter board. They are pretty simple to change out and generally pretty cheap depending on your model of laptop. If you remove the bezel around the LCD screen, you should see the inverter board just underneath the screen itself. They are usually 4 or 5 inches long with a plug at each end. I would try replacing that before I went looking for a new LCD screen. Hope this helps.
This is due to the light tunnel being out of adjustment or collasped. Either way, it must be determined which it is. The tunnel can only be adjusted while the top is off of the projector. I've done it numerous times, but it is dangerous because the proximity of the screw to the power supply. You should let a professional fix this.
Generally speaking, any area that is darkened, is receiving less light. This can come from a lamp that is failing (similar to a fluorescent lamp used for lighting developing a dark end) or a mirror or optical lense that is contaminated with toner.
This may require some disassembly to diagnose and cure.
You may also want to visually check the fuser assembly (often accessible behind a door) to ensure there is no toner buildup on the affected side.
For photocopiers the symptom that you have described could be accounted for by a number of things. The first step would be to determine where the problem is originating from. Dirty optics could be the main culprit. The mirrors used to reflect the image onto the drum unit can build up with dust and cause a darkening of the image or an uneven image darker on one side. Cleaning the optics will correct this. If there are bad or worn seals on the developing unit it may be spilling excess toner down one side of the page as the paper is passing over the transfer corona/roller. You can check for this by stopping the copy process before the paper gets to the fusing assembly. If the dark band is on the paper before it has reached the fuser than it is either the optics, a worn out or possibly over exposed drum or problems with the developing unit or exposure lamps if so equipped. If the copy is clean before it goes through the fusing unit then it could be the fusing rollers have worn out and need to be replaced or if lucky just the fuser cleaning wick, felt or blade is worn and needs to be replaced.
the reflecting mirror is likely loose and falling down inside the light reflecting tube. you should have seen the band getting darker and larger, the small mirror is in front of the lamp and bends the light, remove the lamp and look down the tube (light path)