Daewoo 710B Service Manual page 16

Self Diagnosis
When the monitor doesn't display, if you press any key, Self Diagnosis screen is displayed.
Self Diagnosis function checks if the status of the monitor is No Signal or Out of range.
No Signal screen is displayed when the D-Sub signal connector is not
connected or the status of the monitor is on DPMS mode.
Out of Range screen is displayed when the applied frequency is
under or over normal range.
Normal range
H : 30-69 KHz
V : 50-160 Hz
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