Sony Trinitron GDM-FW900 Service Manual page 13

Trouble symptoms and remedies
If the problem is caused by the connected computer or other equipment, please refer to the connected equipment's instruction manual.
Use the self-diagnosis function (page 20) if the following recommendations do not resolve the problem.
Symptom Check these items
No picture
If the ! (power) indicator is not lit
• Check that the power cord is properly connected.
• Check that the ! (power) switch is in the "on" position.
If the NO INPUT SIGNAL message • Check that the video signal cable is properly connected and all plugs are firmly seated in
appears on the screen, or if the their sockets (page 6).
! (power) indicator is either orange
• Check that the INPUT switch setting is correct (page 9).
or alternating between green and • Check that the video input connector's pins are not bent or pushed in.
orange
xProblems caused by the connected computer or other equipment
• The computer is in power saving mode. Try pressing any key on the keyboard or moving
the mouse.
• Check that the computer's power is "on."
• Check that the graphic board is completely seated in the proper bus slot.
xProblems caused by the connected computer or other equipment
If the OUT OF SCAN RANGE
• Check that the video frequency range is within that specified for the monitor. If you
message appears on the screen
replaced an old monitor with this monitor, reconnect the old monitor and adjust the
frequency range to the following.
Horizontal: 30 – 121 kHz
Vertical: 48 – 160 Hz
If no message is displayed and the • Use the Self-diagnosis function (page 20).
! (power) indicator is green or
flashing orange
If using Windows 95/98 • If your PC/graphic board has difficulty communicating with this monitor, download the
specific driver by accessing the web site of Microsoft Corporation.
If using a Macintosh system • When connecting to a Power Mac G3/G4 that has 3 rows of pins, check that the supplied
exclusive Power Mac G3/G4 adapter and the video signal cable are properly connected
(page 6).
• If you connect to the other version of Macintosh series computer that has 2 rows of pins,
you will need a different adapter (not supplied).
Picture flickers, bounces, • Isolate and eliminate any potential sources of electric or magnetic fields such as other
oscillates, or is scrambled
monitors, laser printers, fluorescent lighting, televisions, or electric fans.
• Move the monitor away from power lines or place a magnetic shield near the monitor.
• Try plugging the monitor into a different AC outlet, preferably on a different circuit.
• Try turning the monitor 90° to the left or right.
xProblems caused by the connected computer or other equipment
• Check your graphic board manual for the proper monitor setting.
• Confirm that the graphics mode (VESA, Macintosh 21" Color, etc.) and the frequency of
the input signal are supported by this monitor (Appendix). Even if the frequency is within
the proper range, some graphic boards may have a sync pulse that is too narrow for the
monitor to sync correctly.
• Adjust the computer's refresh rate (vertical frequency) to obtain the best possible picture.
Picture is fuzzy • Adjust the brightness and contrast (page 11).
• Degauss the monitor* (page 15).
• If CANCEL MOIRE is ON, the picture may become fuzzy. Decrease the moire
cancellation effect or set CANCEL MOIRE to OFF (page 14).
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Symptom Check these items
Picture is ghosting • Eliminate the use of video cable extensions and/or video switch boxes.
• Check that all plugs are firmly seated in their sockets.
Picture is not centered or sized • Press the ASC button (page 9).
properly
• Adjust the size or centering (page 12). Note that some video modes do not fill the screen
to the edges.
Edges of the image are curved • Adjust the geometry (page 12).
Wavy or elliptical pattern (moire) • Set CANCEL MOIRE to ON and adjust the degree of moire cancellation until the moire is
is visible
at a minimum (page 14).
xProblems caused by the connected computer or other equipment
• Change your desktop pattern.
Color is not uniform
• Degauss the monitor* (page 15). If you place equipment that generates a magnetic field,
such as a speaker, near the monitor, or if you change the direction the monitor faces, color
may lose uniformity.
• Adjust the landing (page 14).
White does not look white • Adjust the color temperature (page 12).
• Check that the five BNC connectors are connected in the correct order (page 6).
Letters and lines show red or blue • Adjust the convergence (page 15).
shadows at the edges
Monitor buttons do not operate • If the control lock is set to ON, set it to OFF (page 15).
( appears on the screen)
IMAGE RESTORATION function • Before using this function, the monitor must be in normal operation mode (green power
does not operate
indicator on) for at least 30 minutes. For more information on using the IMAGE
RESTORATION function, see page 14.
COLOR
• Adjust the computer's power saving settings to keep the monitor in normal operation
EASY EXPERT s R G B
mode for more than 30 minutes.
5 0 0 0 K 6 5 0 0 K 9 3 0 K 0
• The monitor may gradually lose its ability to perform this function due to the natural aging
5 0 0 0 K
of the picture tube.
I MAGE
RES TORA T I ON
AVA I L AB L E
A F T ER WARM UP
USB peripherals do not function • Check that the appropriate USB connectors are securely connected (page 8).
• Check that the ! (power) switch is in the "on" position.
xProblems caused by the connected computer or other equipment
• Check that the power of any self-powered USB compliant peripheral devices is "on."
• Install the latest version of the device driver on your computer. Contact your device's
manufacturer for information about the appropriate device driver.
• If your USB compliant keyboard or mouse does not function, connect them directly to
your computer, reboot your computer, and make any necessary adjustments to the USB
settings. Then reconnect the keyboard or mouse to the monitor. If you connect a keyboard
or mouse to the USB connectors and then boot your computer for the first time, the
peripheral devices may not function.
• For customers using Windows 95
1. Right-click on My Computer and select Properties.
2. Click on the Device Manager tab. Scroll down and select Universal Serial Bus
Controller.
If Universal Serial Bus Controller does not appear, you need to load a USB supplement
disk. Contact your computer's manufacturer for more information about obtaining a
USB supplement disk.
3. Select Generic USB Device from the USB controller list and click on Properties.
4. If there is a check in the box next to "Disable in this hardware profile," remove the
check.
5. Click on Refresh.
A hum is heard right after the • This is the sound of the auto-degauss cycle. When the power is turned on, the monitor is
power is turned on
automatically degaussed for 3 seconds.
* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result. A humming noise may be heard, but this is not a
malfunction.
GB
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