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My projector is showing a large blue dot on the screen, and im stumped to why this is happening. i've cleaned the lens numerous times and i've even tried replacing the globe, still no luck.
I have a Sanyo SU30 projector that has displays a blue-ish tint/color in upper middle of the screen. Sometimes the area is larger than other times. Replaced the bulb but still has same problem.I have a Sanyo SU30 projector that has displays a blue-ish tint/color in upper middle of the screen. Sometimes the area is larger than other times. Replaced the bulb but still has same problem.
AnonymousMar 25, 2014
m210x white dotsm210x white dots
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I agree with Mark Webber, as I had the same problem with a projector. It was probably caused by "burnout" as a menu message box was left sitting for hours , if not days, displayed on the screen. It left a green, almost square area. I took the projector apart and managed to remove the damaged polariser, but when I contacted a service centre to get a replacement part they told me it was not a viable repair for them to do, nor would they supply me with a spare part. real shame, cos i am sure it will be a relatively cheap component. Hope you have better luck than me
This is going to hurt..
You probably have a polarizer failing on one of the LCD panels inside.
There are 3 of these in LCD projectors, red, green, and blue. They all get the light fed into them, that light is then combined and fed through the projection lens.
You will need to contact Sanyo to find a service centre to replace it.
The problem with projectors in general is they don't sell enough of them to stock huge amounts of parts. They normally make up about 2000 units, then keep a 100 or so more that they will strip for parts as needed.
This is why alot of the times if you have a warranty repair close to the end of the warranty you end up with a different model projector sen back that was higher then the previous version.The problem with projectors in general is they don't sell enough of them to stock huge amounts of parts. They normally make up about 2000 units, then keep a 100 or so more that they will strip for parts as needed.
This is why alot of the times if you have a warranty repair close to the end of the warranty you end up with a different model projector sen back that was higher then the previous version.
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perhaps it is the reason of DMD chips, if the DMD chips had been bad, it will show some white or dark dots on the screen, it looks like that this machine need 1076-6038B DMD, but I can't make sure. so need you to find a repair man help you to reconfirm it. this DMD is not expensive, so please don't be worry aobut it,
My first guess is contamination on the lens or the internal LCD itself. I would clean the lens first, and if that doesn't solve the issue, open the unit and clean the LCD panel.
can you take some pictures of the optics and send them to me ? this could be a circuit fault or a defective run from the manufacture, you will half to identifie whether it is optic or circuit related, try and place a piece of color filter opaque paper between the optics and try to notice the changes on the screen this may give you an indication which element may be faulted, or if it is electronic
How defined are the dots? Is each blue dot limited to the size of a pixel? I suggest you create a 3 slide image in powerpoint ..one slide completely blue, 1 red and one green. then project each image in turn and note what happens with the blue dot. My first thoughts are you have some pixels that are locked. Once that happens if are pretty much stuck with them. Optical it is impossible for a dust on the lens etc to cause them as if the picture is in focus at the screen the dust is way out of the depth of the field, sometimes you can focus the projector so that the point of focus is the lens surface but then the actual content will be way out of focus...none of which has anything to do with your blue dots. Regards Kevin Andreassend, ICE AV Technology Ltd, http://www.digitaldaytime.com
there is a burned-in spot on the polerizer light filter for the blue lcd. it makes sure the light is blue coming through, that's why it is black on a blue screen, and yellow when the red and green are the only light showing through. it needs to be replaced. pat # PFiLW0213CEZZ.
if the dots are pixelated, you have an lcd issue (or if you have a dlp, it's a dmd issue). if it's not pixelated, try to focus the lens on them. if you can, it's dust. blow it out with canned air.
oh it hurts.
yes its the polariser. and yeah looks like i'll have to get a new one :(
anyway thanks for the quick reply.
I have a Sanyo SU30 projector that has displays a blue-ish tint/color in upper middle of the screen. Sometimes the area is larger than other times. Replaced the bulb but still has same problem.
m210x white dots
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