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DUST ON LCD PANEL
3
Small amount of dust might lie on the LCD panel with the
course of operating time of the LCD projector and cause
poor image. And residual dust inside the product might
collect on the LCD panel during shipment, etc. and cause
poor image as well. Clean the inside of the product,
according to the following.
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Symptom
When Projecting R, G, B Monochrome
Pictures and White Raster
• Dust appears to be a black spot such as a missing dot
on R, G, B monochrome pictures. The black spot
appears to be blurry when the picture is in focus.
Note:
If the black part appears sharply in the shape of LCD
pixels when the picture is in focus, the defect lies in
LCD panel.
• Cyan, magenda, or yellow blurry spot appears, when the
picture is in focus on the white raster.
Note:
If the spot appears sharp in the shape LCD pixels
when the picture is in focus, the defect lies in LCD
panel.
When Projecting Black Picture
• R, G, or B blurry light appears on the black picture when
the picture is in focus.
Note:
If R, G, or B point appears sharp in the shape LCD
pixels on the black picture when the picture is in
focus, the defect lies in LCD luminescent points.
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Before Cleaning
Before cleaning the inside of the product, be sure to check
the fitter of the intake fan and replace it as much as possible
if it is dirty.
When attaching the filter, confirm carefully that there is no
dust or other foreign object on the side facing inside the
product. If reattaching the filter after cleaning it, in order to
prevent dust, be careful to reattach it as was attached
(attach the side facing outside the product so as to face
outside).
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Cleaning
Blow off the dust on the LCD panel side using air duster,
etc. Refer to the followings.
• If dust appears on the R, G, or B monochrome pictures,
dust lies near the LCD panel of each color.
• If dust appears on the white raster, confirm on the R, G,
or B monochrome pictures.
(Reference)
If dust appears to be cyan
: Dust lies near the red LCD panel.
If dust appears to be magenda
: Dust lies near the green LCD panel.
If dust appears to be yellow
: Dust lies near the blue LCD panel.
• If dust appears on the black picture, it lies near the LCD
panel of each lit color.
• Confirm the picture by shifting the focus lens from the
standard point where the picture is in focus.
If dust appears sharply when the focus lens is shifted
forward, it lies near the lens side of each LCD panel.
If dust appears sharply when the focus lens is shifted
backward, it lies near the light source side of each LCD
panel.
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After Cleaning
Reattach the upper case assy, etc. after cleaning. Set the
product to the normal condition and check the picture. To
prevent dust from entering the inside of the product, instruct
the user to confirm carefully that there is no dust or foreign
object on the side of the filter facing inside and to reattach it
as was attached. (attach the side facing outside the product
so as to face outside).
Summary of Contents for S290U
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