Mitsubishi Electric DLP HC7900DW User Manual page 47

Troubleshooting (continued)
No image appears on the screen. (continued)
Problem
The screen for
entering the password
appears.
"NO SIGNAL" is
displayed.
Images may be jagged
when connecting the
projector using the
HDMI cable.
"NO SIGNAL" is
displayed when
connecting the
projector using the
HDMI cable.
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.
White dots are seen
on projected images.
Black dots are seen
on projected images.
Rainbow effect is seen
on projected images.
Solution
• PASSWORD FUNCTION in the FEATURE menu has been set to DISPLAY INPUT to
enable the password lock.
 Enter the password or contact the person in charge of management of the
projector. (See page 41.)
• 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.
• Make sure if the cable is firmly plugged into the connecting terminal.
• To accept and display 1080p signals on the screen, make sure to use a high-speed
HDMI cable that can transmit 1080p signals.
• When a distributor or an AV amplifier is connected using an HDMI cable, check that
the distributor or the AV amplifier complies with HDMI1.3 or higher (Deep Color).
When displaying 3D images, check that the distributor or the AV amplifier complies
with HDMI1.4 or higher (3D display).
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.
• Press the AUTO POSITION button.
• Some computers output out-of-spec signals on rare occasion. Adjust the SIGNAL
menu. (See page 40.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 10.)
• Adjust BRIGHTNESS and CONTRAST in the IMAGE menu. (See page 36.)
• Replace the lamp. (See page 42.)
• Adjust the focus. (See pages 18 and 23.)
• Clean the lens.
• Press the t or u button on the remote control to eliminate flicker.
• Adjust TRACKING and FINE SYNC. in the SIGNAL menu. (See page 40.)
• Set OVER SCAN in the SIGNAL menu to 100%. (See page 34.)
• Set KEYSTONE in the INSTALLATION menu to 0. (See page 32.)
• Adjust BRIGHTNESS and CONTRAST in the IMAGE menu. (See page 36.)
• Adjust the projector and the screen so that they are perpendicular to each other. (See
page 10.)
• This symptom is normal for a DLP™ projector and is not a malfunction. (A very small
number of pixels may stay lit or out, but such symptom is not a malfunction. Pixels of
99.99% or more are effective.)
• This is due to color breaking noise that occurs in a DLP™ system and is not a
malfunction.
EN-47