SDM-N50 (serv.man2) - Sony Monitor Service Manual (repair manual). Page 14

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Automatic brightness adjustment function (light sensor)
This monitor is provided with a feature to automatically adjust the screen brightness according to the brightness of the surroundings. The 
brightness of the backlight is set to the most appropriate level by setting the light sensor to ON. The default setting of the brightness of the 
backlight is set to its maximum. When the light sensor setting is set to ON, the monitor adjusts the brightness of the backlight linearly from 
its lower- to upper-limit values. When the user adjusts the backlight, the backlight brightness is automatically adjusted between the user 
adjustment value and the upper- and lower-limit values.
Automatic picture quality adjustment function
When the monitor receives an input signal, it automatically 
matches the signal to one of the factory preset modes stored in the 
monitor’s memory to provide a high quality picture at the center 
of the screen. (See Appendix for a list of the factory preset 
modes.)
For input signals that do not match one of the factory preset 
modes, the automatic picture quality adjustment function of this 
monitor automatically adjusts the picture position, phase, and 
pitch, and ensures that a clear picture appears on the screen for 
any timing within the monitor’s frequency range (horizontal: 30 – 
61 kHz, vertical: 50 – 85 Hz). 
Consequently, the first time the monitor receives input signals 
that do not match one of the factory preset modes, the monitor 
may take a longer time than normal for displaying the picture on 
the screen. This adjustment data is automatically stored in 
memory so that next time, the monitor will function in the same 
way as when the monitor receives the signals that match one of 
the factory preset modes.
In all modes as above, if the picture is adjusted, the adjustment 
data is stored as a user mode and automatically recalled whenever 
the same input signal is received.
Note on the adjusting the phase
If the automatic picture quality adjustment function is activated, the 
picture moves slightly whenever the monitor receives the input signal, 
regardless of the stored adjustment.
Note
While the automatic picture quality adjustment function is activated, only 
the 
1 (power) switch, and INPUT button will operate.
User-specified 
brightness value
Backlight brightness
Maximum
User adjustment value
Minimum
Automatic brightness adjustment 
after user adjustment
Preset automatic adjustment
Brightness of surroundings
Brightness during 
user adjustment
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US
Troubleshooting
Before contacting technical support, refer to this section.
On-screen messages
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 20.
If OUT OF SCAN RANGE appears on the screen
This indicates that the input signal is not supported by the 
monitor’s specifications. Check the following items.
If “xx.x kHz/xx Hz” is displayed
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.
If “RESOLUTION > XGA” is displayed
This indicates that the resolution is not supported by the 
monitor’s specifications.
If NO INPUT SIGNAL appears on the screen
This indicates that no signal is input, or that no signal is input 
from the currently selected connector.
INPUT:
This indicates the currently selected connector (INPUT: 1 or 
INPUT: 2).
GO TO POWER SAVE
The monitor will enter the power saving mode after about 4 
seconds from the message is displayed.
If CABLE DISCONNECTED appears on the screen
This indicates that the video signal cable has been disconnected 
from the currently selected connector.
INPUT:
This indicates the currently selected connector (INPUT: 1 or 
INPUT: 2). 
GO TO POWER SAVE
The monitor will enter the power saving mode after about 4 
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
I NPUT : 1
GO TO POWER SAVE
I NFORMA T I ON
CAB L E D I SCONNECT ED
I NPUT : 1
GO TO POWER SAVE
I NFORMA T I ON
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