SDM-N50 (serv.man2) - Sony Monitor Service Manual (repair manual). Page 15

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If a 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 22) if the following recommendations do not resolve the problem.

If the AC power indicator is not lit

• Check that the power cord is properly connected.

If the AC power indicator is red

• Check that the 

1 (power) switch is in the “on” position.

If the 

1 (power) indicator is not lit, 

or if the 

1 (power) indicator will not 

light up when the 

1 (power) switch 

is pressed

• Check that the 

1 (power) switch is in the “on” position.

• Check that the AC power switch is in the “on” position.
• Check that the system connecting cable is properly connected and all plugs are firmly 

seated in their sockets (page 8).

If the 

1 (power) indicator is green 

or flashing orange

• Use the self-diagnostics function (page 22).

If the 

1 (power) indicator is 

alternating between green and 
orange

• The monitor cannot return from low power consumption mode because the user sensor 

fails to detect the presence of a user. Press the 

1 (power) switch twice to turn the monitor 

off and then on. If you set the user sensor to OFF, the monitor does not enter low power 
consumption mode (page 16).

If CABLE DISCONNECTED 
appears on the screen, or the AC 
power indicator is flashing red

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

their sockets (page 8).

• Check that the video input connector’s pins are not bent or pushed in.
• A non-supplied video signal cable is connected. If you connect a non-supplied video 

signal cable, CABLE DISCONNECTED appears on the screen before entering the power 
saving mode. This is not a malfunction.

• Check that the system connecting cable is properly connected and all plugs are firmly 

seated in their sockets (page 8).

• Press the AC power switch twice to turn the monitor off and then on. 

If NO INPUT SIGNAL appears on 
the screen, or the 

1 (power) 

indicator is orange

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

their sockets (page 8).

• Check that the input select setting is correct (page 10).
• Check that the video input connector’s pins are not bent or pushed in.

x

• The computer is in the 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 OUT OF SCAN RANGE 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 – 61 kHz
Vertical frequency: 50 – 85 Hz (only XGA mode at 75 Hz)

If using Windows 95/98

• If you replaced an old monitor with this monitor, reconnect the old monitor and do the 

following. Install the Windows Monitor Information Disk (page 9) and select this monitor 
(“SDM-N50”) from among the Sony monitors in the Windows 95/98 monitor selection 
screen. 

If using a Macintosh system

• Check and refer to the supplied “Notes for Macintosh users.” 

21

While the monitor is receiving a video signal, press and hold the 
MENU button for more than 5 seconds to display this monitor’s 
information box.

If any problem persists, call your authorized Sony dealer and give 
the following information:
• Model name: SDM-N50
• Serial number
• Name and specifications of your computer and graphics board.

• Adjust the pitch and phase (page 13).
• Isolate and eliminate any potential sources of electric or magnetic fields such as other 

monitors, laser printers, electric fans, fluorescent lighting, or televisions.

• 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.

x

• Check your graphics board manual for the proper monitor setting.
• Confirm that the graphics mode (VESA, Macintosh 19" 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 video 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 12).
• Adjust the pitch and phase (page 13).

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

• Adjust the pitch and phase (page 13).
• Adjust the picture position (page 13). Note that some video modes do not fill the screen to 

the edges.

• Set the zoom setting to ON (page 14).

x

• Set the computer’s resolution to the screen’s resolution.

• Adjust the pitch and phase (page 13).

• Adjust the pitch and phase (page 13).

• Adjust the color temperature (page 14).

• If the menu lock is set to ON, set it to OFF (page 16).

• Set the power saving function to OFF (page 16).
• Set the user sensor to OFF (page 16).

x

• Set the computer’s power saving setting to off.

    INFORMATION

MODEL : SDM-N50
SER  NO : 1234567
MANUFACTURED : 1999-52

MENU

Example

Model name

Serial number

Week and year 
of manufacture