Its not very big, only about 2mm round(ish), TV was taken apart, thought it might have been a speck of dust/dirt/bug on the back of the screen(or on the mirror, or bulb) but no luck, seems to be coming from right inside the light engine.
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Re: black spot on screen
And yes, you are right. It is the light engine causing it. And unfortunatley you need to have your light engine replaced also. I've replaced several of them for that same reason. So I know what I'm talking about.
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The spot may be from debris inside the chamber of the TV box. A bug, dust speck, or other material can attach to the inside screen or on a color tube inside of the unit. Do not touch the inside of the Front Screen as it has a special coating and you could damage the screen permanently. Avoid washing with water or sprays that can enter the frame of the screen. Use a cloth with cleaner applied to it and wipe clean, then dry with a soft rag or paper towel.
I fixed it!!!! If you can open one of the sides (on the JVC there is a little door with a screw), then you can clean the projector lense in the middle on the bottom. It kind of looks like a big light bulb. It seems there is just dust on the glass that is projected onto the screen. We had a big gray spot and cleaned it with a damp glass cloth and Ouila! It disappeared. I scored MAJOR brownie points with my husband for this one! He wanted to replace the TV!
The dust is on the lcd located inside the optical block. It requires quite an extensive tear down and if you're not at the minimum a CET don't attempt this one yourself... Most shops won't even do this cleaning in the home and any repuatble shop that does it has a clean room they will put it in to do the work..
A single speck of dust no larger than 25 microns on the lcd can shadow in the picture. To give you some idea how small that is a blood cell is 7 microns wide...
CCD sensor has some dirt/dust on it . Set camera to B ( in manual mode scroll until 'bulb' is displayed in the top display ) . Take lens off and release the shutter and keep the button pressed down so that the sensor is exposed : use blower to remove dust/dirt but NB do not touch sensor surface as you will make it even dirtier. Take some shots to see if the spot has gone and repeat if it has not disapear.
I had a similar problem and brought it in to a technician for a quote of $860 to fix. The problem - speck of dust on the optics. If it weren't under warranty I would take it apart and blow off the dust myself.
I have the same TV, and I was getting the black spots on my screen as well. It is dust settling on the bottom mirror. Yoiu can call Mitsubishi and spend 150-200 on getting it cleaned, or you can do like I did and take the front panel off and the 10 screws around the edge on the back of the black plastic border around the screen. Then lift up gently and have someone hold the screen for you and gently dust the bottom mirror. I did this by myself, but it would be wise to have 2 people do it.
One or more of the Cold Cathode tubes that illuminate the lcd backlight may be bad. i have the 19" and it has 4 - 2mm X 400mm tubes (two at the top and two at the bottom). One of them quit so to test it out i temporarily replaced it with one from my pc and it started up fine. You can order from: http://store.ccfldirect.com/index.html But ONLY if you have knowledge of electronics, patience, a steady hand, and fine screw driver set. (oh and latex gloves in a dust free environment.) You don't want to get the screen layers back together only to find some hairs or dust specks light up when you turn the lcd on! btw: The tubes are as small as the ink tubes in a ball point pen and can snap very easily...
My Nikon was having the same problem with the stationary black spot. I used a can of Dust Off ( the original compressed gas duster). I just removed the lens and held the camera upside down (lens facing the floor) and blew my compressed air inside and my black spot disappeared. Just a thought you might like to know !! Good luck.