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Mitsubishi Electric DLP UD740U User Manual Page 63

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Troubleshooting (continued)
No image appears on the screen. (continued)
Problem
The screen for
entering the password
appears.
"No signal" is
displayed.
Images are not displayed correctly.
Problem
Projected images are
shaking.
Projected images are
displaced.
Projected images are
distorted.
Projected images are
dark.
Projected images are
blurred.
Afterimages persist on
the screen.
White dots are seen
on projected images.
Black dots are seen
on projected images.
Fine streaks are seen
on projected images.
Solution
• Password in the Password menu has been set to On to enable the password lock.
 Enter the password or contact the person in charge of management of the
projector. (See page 57.)
• Turn on the power of the connected device, or check whether there is something
wrong with the connected device.
• Check whether the external device output signals. (Check this especially when the
external device is a notebook computer.)
• Check that the cable connected to the external device isn't defective.
• Check that the projector is connected to the external device using the correct
terminals.
• Check that the connected device is correctly selected as the input source.
• When an extension cord is being used, replace it with the supplied cable and check
whether images are projected correctly. If images are projected correctly, use an RGB
signal amplifier along with the extension cord.
Solution
• Check that the cable connected to the external device isn't intermittent.
• Connect the cable's plug with the external device's connector firmly.
• Project an image containing a lot of characters without black areas and press the
AUTO POSITION button.
• Some computers output out-of-spec signals on rare occasion. In such a case, change
the setting of Signal Detect in the Option menu and press the AUTO POSITION
button. If the position (and size) of the projected images is still incorrect, make
adjustment using the Signal menu. (For details, see the flowchart on page 33.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 15.)
• Adjust Brightness and Contrast in the Picture menu. (See page 31.)
• 3D images displayed on the projector appear darker. It is normal and does not mean the
projector is malfunctioning.
• When viewing 2D images, set 3D in the Picture menu to Auto
to Off
. (When Auto
• Replace the lamp. (See page 60.)
• Adjust the focus. (See page 16.)
• Clean the lens.
• Press the  or  button on the remote control to eliminate flicker.
• Adjust Tracking and Fine sync in the Signal menu. (See page 25.)
• Set Overscan in the Signal menu to 100%. (See page 25.)
• Set the keystone adjustment value to 0 using the KEYSTONE button. (See page 15.)
• Adjust Brightness and Contrast in the Picture menu. (See page 31.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 15.)
• This phenomenon is improved by keeping projecting an evenly bright image. (Such
"image burn-in" phenomenon where afterimages persist on the screen may occur if a
stationary image is kept displayed on the screen for a long time.)
• This phenomenon is normal for a DLP™ projector and is not a malfunction. (A very
small number of pixels may visibly or invisibly be persistent all the time, but they are
not a sign of system malfunctions. Over 99.99% of the pixels are effective.)
• This is due to interference with the screen surface and is not a malfunction. Replace
the screen or displace the focus a little.
• Vertical or horizontal streak noise may appear on the projected image, depending on
the type of the DVD player, game console or computer you use. In such a case, you
can reduce such streak noise by enabling the LPF.
is selected, only 3D images become darker.)
EN-63
(for HDMI input only) or

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