Vertical line on rear projection TV - Akai PT4298HD
Per the intructions of an online FixYa expert, I did check the mirror and lens covers to see if there was anything on either of them causing the line. Neither one had any dirt on them. However, as I look down inside the green projector, I can see the line/dot inside there. I can only see it when looking down the green tube, but neither the red or blue. What is this telling me? Is there anything I can do, or is this going to require a TV technician? I do not want to spend a fortune on this, but at the same time the picture on this TV is too good to give up on getting rid of this line.
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remove the glass [two screws on the scale] very carefully clean the mirror that is near the lamp that is mirror 1 then clean the two mirrors that are nearest the side that the paper comes out that is mirrors 2+3 then remove the black lens cover i think it is held in place with two screws then clean the mirror that is there dont try to cean the mirror under it yet then open your machine and remove the cleaner unit follow the wire that goes to the unit and remove the black cover and unplug the unit, remove the toner cartridge you eill see either a black screw or a gold screw remove it slide out the unit and put one side gently.then look in the machine you will se a black cover slide your fingers in on the plate nearest you and you will feel a black screw remove the screw and then the cover will be loose remove it and clean the two mirrors there as well as the discharge lamps look in the optics cavity there are two slots near the lens, slide the two pins on the cover that you removed from the inside of the machine into them and slide upwards and retighten the black screw the rest is done in reverse good luck
I received a similar HP Laserjet Color Printer with same issue for repair/ maintenance a few months back. Actually the problem is with the printer design not the magenta cartridge and it needs professional hands for servicing and cleaning. The mirrors which reflect laser beam get covered with dust and toner. hence the image is not produced properly. note that first magenta goes off, followed by yellow, then cyan and lastly black. this is because of the mirrors placement inside the printer.
Rest assure that the printer requires ONLY CLEANING OF THE MIRRORS, which are inside the printer.
Clean them yourself with dry n soft cloth (if you are familar with such tasks) or get it cleaned by any printer repair/ service professional. Please note that the mirrors, lenses and scanner assembly inside such printers is extremely complex and can get damaged very easily especially the mirrors.
The line doesn't show up when you print, right? If you are feeding your original from the document feeder when you get the line, there is most likely Wite-Out, dirt or other debris on the thin strip of glass to the left of the main scanner glass. You'll probably be able to see whatever is causing the line and clean it off, but if you can't see anything, try cleaning that glass strip with isopropyl alcohol and a lint-free rag.
If you get the line when copying off of the main scanner glass, there is dirt or dust on your scanner's mirrors, lamp, or lens. To get rid of the line, you'll have to take the glass and surrounding covers off and blow compressed air onto the mirrors and other pieces of the optics assembly. If that doesn't get rid of the line, wipe the mirrors down with a dry lint-free rag.
I had the same problem on my 50" DLP. Today I took the light projection mechanism apart to get to the
mirror tunnel (a piece about 1.5" long located between the projection bulb
housing and lens housing) and, for now at least, the shadow problem has
been corrected on my TV.
It would be difficult to describe in detail without photos of how to
remove the mirror tunnel. Briefly, once the lower rear cover is removed, it
involves completely removing the entire assembly of the projection bulb and lens,
along with disconnecting 3 or 4 cable connections. This assembly is held in place with 3 large screws around the projection lens housing in the lower center of the TV. After it's completely removed from the TV, removing smaller screws will break down the component parts. Once you locate the color wheel (about 2" in dia.) between the bulb and lens, the mirror tunnel is directly adjacent to it.
Handle it all with care, and I strongly suggest that you immediately cover the protruding projection lens will a lens cleaner cloth (held by rubber band) so it doesn't get scratched or smudged while you're working on the assembly. This will all make more sense after you get into it. Just remember where everything
goes, both cables and screws!
My four mirrors had indeed shifted into a flatter parallelogram than it
should be. On my set the metal tunnel casing is molded so
that it doesn't allow for the mirrors to be in the shape of a rectangle;
it requires a parallelogram shape. The mis-shapened tunnel caused a small
portion of the metal mirror housing (on the lamp end) to protrude into the interior of the
tunnel, hence the shadow on the screen.
To re-shape the mirrors I gently inserted a nylon cable tie--with a
sharpened leading edge--into the tiny gap behind the mirror that had
shifted. In doing so the mirrors shifted back to the proper positions and stayed
there when I removed the cable tie. (Be very gentle with the mirrors and do not insert anything into the tunnel!)
It's not clear why this (now restored and larger) gap behind that one
mirror even exists, but to ensure the the mirrors don't shift again, I
inserted and left in a length of cable tie (which is near perfect in
thickness and width) in the gap. Time will tell whether heat will deform
Perhaps a similar-size strip of metal would be better but I didn't
have one. And I would not use any kind of glue or adhesive on these mirrors (as others have suggested); with their small size and the need to keep them crystal clear there is just too much potential to royally mess them up.
After putting it all back together and testing, the shadow is gone. Hope
this helps and works for others!
There are several possible reasons for it, so let me go through them, one by one.
1. Dirty or Defective lens. Check your lens, and if you have a way to get other lens to test the camera, please do it. This includes to check for proper cleaning of both the lens glass and the lens contacts.
Sometimes the iris mechanism in the lens is failing, so there is not adequate light through the lens, which causes this problem.
2. Behind the main mirror, there is the secondary mirror, which is used for auto-focus. I warn you that you have to perform the following with extreme precautions.
There is a spring that is located on the right side of the main mirror (seeing the front of your camera). such srping keeps in palce the secondary mirror. You need to move the main mirror with a tip of a pen (something plastic, not metal) without force so much such mirrors, and don't touch the shutter blades behind the mirrors.
Moving the mirrors you will see ans sense such spring. IF the spring is lose or missing, then that is the reason that such Auto-Focus is not working.
3. Dirty contacts on the camera where the lens is attached. Just clean them (No liquids. Just an eraser pencil or dry wipe will do the job).
4. Defective DC/DC board that controls the lens auto-focus mechanism. Unfortunately, only it can be confimed in a Camera repair shop.
I hope the above can help you to identify why your camera is failing.
1) Turn the camera on. 2) Press the "Menu" button. 3) Press the right arrow to the "Set-up" tab. 4) Press the down arrow to the "Sensor Cleaning" item on list. 5) Press the right arrow & follow the on-screen instructions.
And don't touch the sensor with anything. (You will damage the sensor). And don't blow on the sensor. (You will get your spit on the sensor). I used one of those old rubber blow bulbs that people used to clean their lenses with before the Lens Pen came along.
A mirror got loose in the opening from where the bulb sends the light to the "panel" It is blocking part of the light.
I'm not talking about one of the tiny mirrors that makes up the DLP, but there is silver box where the bulb light initially goes. the walls are lined with mirrors whose adhesive fails when exposed to great heat.
I can easily fix it, as i have fixed many of them from this problem.