My c170 has started displaying a shodow on the left side of the display. Looks like maybe a mirror or something is out of aliniment. Can my local computer repair center fix this for me? Can you tell me what causes this?
May be the mirror could be out of alignment, but due to hot beam the inside lamp burns the dust inside and outside because in running mode it's too hot. I think u must take it to the good service centre to clean it fromboth side. same as scanners.Also check the mirrors, they are not changing colour, if u are using it to much.
best of luck...
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Hi. This tip may be helpful only if your rear projection TV is displaying a darker shadow on one portion of the screen. If the shadow shape and size will not vary, that means that there is probably a detached mirror in the device called Light Tunnel, located inside your TV.
Most rear projection TV works projecting the light from the internal lamp on the screen. Before reaching the screen , the light will pass through a 'pipe' whose internal surface is covered in rectangular mirrors, located all over the tunnel surface.
A quite common fault is caused by one of the mirror detaching from the the light tunnel internal surface , and falling down or hanging in there. This will be seen on the display as a darker shade located near to one side of the screen. The light tunnel is located in the light engine. To repair the problem the TV must be disassembled by a technician. Accessing and disassembling the light engine is not a repair that can be done by the owner.
Click here to view pictures of a light engine for a Samsung rear projection model. The tunnel is the optical device located in the light engine. If you are a technician, to replace the light tunnel you will have to take apart the light engine, that apart of being quite a sensitive optical device, is also the most expensive part on a rear projection TV. In that case you may find useful the service bulletin posted below, that is illustrating how to replace the light tunnel on a light engine for Samsung rear projection TV. Please be aware, that if you attempt doing this operation without sufficient knowledge and experience, you may damage your TV set beyond repair, as the light engine is very expensive. How to replace light tunnel on a Samsung rear projection:SERVICE BULLETIN The file is on PDF format. Regards. Ginko.
This is a failure of the DMD board. The DMD board is the device that has the "million little mirrors" that compose each pixel of your display. The black specs are mirrors that are stuck in the off posistion therefore not reflecting any light at all. The white specs are the opposite reflecting light all of the time. This is a repair you should leave to a TV technician as once this board is repalced there is some electrical and mechanical alignment needed. Please take a moment to rate my answer. Thanks...
It's the light tunnel. The tunnel is a square tube made up of 4 mirrors glued together.
It looks like this from the side: |_| (with a piece on top too.) When the glue breaks down, it shifts inside the little mirror holder. The shifted mirrors looks like this /_/ what you are seeing is the shadow of the tilted mirror tunnel. ON the RCA's there's not a good fix.
RCA's response: "Ok, well sadly they do not offer the light tunnel anymore, which is what you need. Sadly you would be rendered to get a whole new light engine assembly. That would be the D.N.D module, light tunnel,color wheel,optic spanner, and oci. mirror. Your best bet would be to search ebay for a broken engine and replace it that ways."
That is the ONLY response I got from them.
I took the set apart and found the 4 tiny mirrors. I will be attempting to epoxy them together. (The set is dead anyway, why not try?)
turning off the main can be very harmful to rear projectors if you dont wait for the cooling off period, for instance when you turn off the tv from the remote, the fans inside are still on in order to dissipate the heat given out by the lamp. as a result some of the lens inside the engine may have burns-in caused by excess of heat.thus leading to shadows on the screen.
Does it appear on the photos if you look at them on a computer or print them out, and does the spot remain when you're using the menu? If it's there all the time (on menus as well) it would suggest part of the display is starting to fail. Also, have you done the shutter hold-up so you can check behind the mirror just in case it's something on the sensor (assuming it's not just the LCD that's failing)?