SDM-M51 (serv.man2) - Sony Monitor Service Manual (repair manual). Page 13

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Before contacting technical support, refer to this section.

If there is something wrong with the input signal, one of the 
following messages appears on the screen. To solve the problem, 
see “Trouble symptoms and remedies” on page 19.

This indicates that the input signal is not supported by the 
monitor’s specifications. Check the following items.

This indicates that either the horizontal or vertical frequency 
is not supported by the monitor’s specifications.
The figures indicate the horizontal and vertical frequencies of 
the current input signal. The horizontal frequencies above 
100 kHz and the vertical frequencies above 100 Hz are 
represented by 99.9 kHz and 99 Hz, respectively.

This indicates that the resolution is not supported by the 
monitor’s specifications.

This indicates that no signal is input.

The monitor will enter the power saving mode after about 5 
seconds from the message is displayed.

This indicates that the video signal cable has been disconnected 
from the currently selected connector.

The monitor will enter the power saving mode after about 5 
seconds from the message is displayed.

OUT OF SCAN RANGE

x x . x k H z /

x x H z

I NFORMA T I ON

NO

I NPUT S I GNA L

GO TO POWER SAVE

I NFORMA T I ON

CAB L E D I SCONNECT ED

GO TO POWER SAVE

I NFORMA T I ON

19

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 21) if the following recommendations do not resolve the problem.

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 power cord is properly connected.
• Check that the 1 (power) switch is in the “on” position.

If the 1 (power) indicator is green 
or flashing orange

• Use the self-diagnostics function (page 21).

If CABLE DISCONNECTED 
appears on the screen

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

their sockets (page 7).

• 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 may appear on the screen before entering the 
power saving mode. This is not a malfunction.

If NO INPUT SIGNAL appears on 
the screen, or the 1 (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 7).

• 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 your graphic board is attached to the computer properly.
• Check that the computer’s power is “on.”

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: 28 – 64 kHz, Vertical frequency: 48 – 75 Hz

If using Windows 95/98/2000

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

following. Select “SONY” from the “Manufactures” list and select “SDM-M51” from the 
“Models” list in the Windows 95/98/2000 device selection screen. If “SDM-M51” does 
not appear in the “Models” list, try “Plug & Play” or install the newest information of the 
Sony Computer Display from the Windows Monitor Information Disk (page 9). 

If using a Macintosh system

• When connecting to a Power Mac G3/G4 that has 3 rows of pins, check that the supplied 

Macintosh adapter and the video signal cable are properly connected (page 7).

• 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).

• 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.
• Change the orientation of the display.

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 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.