GDM-FW900 - Sony Monitor Service Manual (repair manual). Page 13

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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.

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 
appears on the screen, or if the 
! (power) indicator is either orange 
or alternating between green and 
orange

• Check that the video signal cable is properly connected and all plugs are firmly seated in 

their sockets (page 6).

• Check that the INPUT switch setting is correct (page 9).
• Check that the video input connector’s pins are not bent or pushed in.

x

• 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.

If the OUT OF SCAN RANGE 
message appears on the screen

x

• Check that the video frequency range is within that specified for the monitor. If you 

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 
! (power) indicator is green or 
flashing orange

• Use the Self-diagnosis function (page 20).

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).

• Isolate and eliminate any potential sources of electric or magnetic fields such as other 

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.

x

• 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.

• 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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* 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.

• Eliminate the use of video cable extensions and/or video switch boxes.
• Check that all plugs are firmly seated in their sockets.

• Press the ASC button (page 9).
• Adjust the size or centering (page 12). Note that some video modes do not fill the screen 

to the edges.

• Adjust the geometry (page 12).

• Set CANCEL MOIRE to ON and adjust the degree of moire cancellation until the moire is 

at a minimum (page 14).

x

• Change your desktop pattern.

• 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).

• Adjust the color temperature (page 12).
• Check that the five BNC connectors are connected in the correct order (page 6).

• Adjust the convergence (page 15).

• If the control lock is set to ON, set it to OFF (page 15).

• Before using this function, the monitor must be in normal operation mode (green power 

indicator on) for at least 30 minutes. For more information on using the IMAGE 
RESTORATION function, see page 14.

• Adjust the computer’s power saving settings to keep the monitor in normal operation 

mode for more than 30 minutes.

• The monitor may gradually lose its ability to perform this function due to the natural aging 

of the picture tube.

• Check that the appropriate USB connectors are securely connected (page 8).
• Check that the ! (power) switch is in the “on” position.

x

• 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.

• This is the sound of the auto-degauss cycle. When the power is turned on, the monitor is 

automatically degaussed for 3 seconds.

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