Troubleshooting - DEC TN-1885T Operating Instructions Manual

Troubleshooting

This section may help you isolate a problem and as a result,
eliminate the need to contact technical support, allowing
continued productivity.
No picture
/ If neither the u (power) indicator nor the
(power saving) indicator is lit.
— Check that the power cord is properly
connected.
— Check that the power switch is in the "on"
position.
/ If the (power saving) indicator is lit.
— Check that your computer power switch is
in the "on" position.
— The monitor will recover when you press
any key on the keyboard of the computer.
— Check that the video signal cable is
properly connected and all plugs are firmly
seated in their socket.
— Ensure that no pins are bent or pushed in
the video input connector.
/ If the u (power) indicator is flashing (green).
— Check that the video frequency range is
within that specified for the monitor.
/ If the u (power) and/or
indicators are flashing.
— Turn the monitor off and on. If the indicator
is off, the monitor is in the normal
condition. If the indicator is still flashing,
there is a potential monitor failure.
/ If you do the above procedures and the
monitor does not recover.
— Unplug the video input 1 and 2 connectors
and wait for 5 seconds. Then press and hold
the > + button for 2 seconds to display the
color bars. If the color bars appear, the
monitor may be in normal condition. Turn
the monitor off and on to return to the
normal operation mode. If the color bars do
not appear, there is a potential monitor
failure.
Picture is scrambled
/ Check this manual and confirm that the
graphic mode and the frequency at which you
are trying to operate is supported. Even within
the proper range some video boards may have
a sync pulse that is too narrow for the monitor
to sync correctly.
Color is not uniform
/ Cycle the power switch once to activate the
Auto-degauss cycle. This function is to
demagnetize the metal frame of the CRT to
obtain neutral field for uniform color
reproduction. If a second degauss cycle is
needed, allow a minimum interval of 20
minutes for the best result.
You cannot adjust the monitor with the buttons on
the front panel
/ If the control lock is set to on, set it to off on
the option OSD (page 8).
You will be able to adjust the monitor.
White does not look white
/ Adjust color temperature on the option OSD
(page 7).
12
Screen image is not centered or sized properly
Edges of the image are curved
White lines show red or blue shades at edges
Picture is fuzzy
(power saving)
Picture bounces or has wavy oscillations
Picture appears to be ghosting
Two fine horizontal lines (wires) are visible
Wavy or elliptical (moire) pattern is visible
• If the problem persists, call your service representative
• Note the model name and the serial number of your
/ Adjust centering, size or picture rotation on
the OSD (page 5-6).
/ Some video modes do not fill the screen to the
edge of the monitor. There is no single answer
to solve the problem. There is a tendency to
have this problem on higher refresh timings.
/ Adjust pincushion on the OSD (page 6).
/ Adjust the convergence on the OSD (page 7).
/ Adjust the contrast and brightness on the OSD
(page 5). We have come across several brands
of SVGA boards that have an excessive video
output level which creates fuzzy picture at
max contrast.
/ Cycle the power switch once to activate the
Auto-degauss cycle. This function
demagnetizes the metal frame of the CRT to
obtain neutral field for uniform color
reproduction. If a second degauss cycle is
needed, allow a minimum interval of 20
minutes for the best result.
/ If red or blue shades are found at the edge of
images, adjust convergence on the OSD
(page 7).
/ Isolate and eliminate any potential sources of
electric or magnetic fields. Common causes for
this symptom are electric fans, fluorescent
lighting, laser printers, and so on.
/ If you have another monitor close to this
monitor, increase the distance between them
to reduce the interference.
/ Try plugging the monitor into a different AC
outlet, preferably on a different circuit.
/ Try the monitor on a completely different
computer in a different room.
/ Eliminate the use of video cable extension
cable and/or video switch boxes if this
symptom occurs. Excessive cable length or
weak connection can produce this symptom.
/ These wires stabilize the vertically striped
Aperture Grille (page 11). This Aperture Grille
allows more light to pass through to the screen
giving the Trinitron CRT more color and
brightness.
/ Due to the relationship between resolution,
monitor dot pitch and the pitch of some image
patterns, certain screen backgrounds,
especially gray, sometimes show moire. This
can only be eliminated by changing your
desktop pattern.
from a location near your monitor.
monitor. Also note the make and name of your
computer and video board.