How to run a monitor self-test?

Last Update Date : Mar 21. 2018

Your monitor provides a self test feature that allows you to check whether your monitor is functioning properly. These are the procedure to run a monitor self-test.


Self-test feature check

1. Turn off both your computer and the monitor.

2. Unplug the video cable from the back of the computer.

3. Turn on the monitor.

The figure shown below ("Check Signal Cable") appears on a black background when the monitor is in its normal working condition though it does not sense any video signal: While in the self-test mode, the LED power indicator remains green and the figure moves around on the screen.


Check Signal Cable

 4. Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor. If your monitor screen remains blank after using the previous procedure, check your video controller and computer system; your monitor is functioning properly.


Not optimum mode

If the vertical resolution is not optimum mode, you may still see the display but the warning message below appears and disappears after one minute. The user must adjust the frequency within that one minute.


Not optimum mode

Refer to Specifications > Preset Timing Modes for the resolutions or frequencies that are supported by the monitor.


Check list before requesting a service

A monitor recreates visual signals received from the computer. Therefore, if there is trouble with the computer or the video card, this can cause the monitor to become blank, have poor coloring, noise, video mode not supported, etc.

1. Check if the power cord and the video cables are properly connected to the computer.

2. Check if the computer beeps more than 3 times when booting.

(If it does, request an after-service for the main board of the computer.)

3. If you installed a new video card or if you assembled the PC, check if you installed the adapter (video) driver and the monitor driver.

4. Check if the scanning ratio of the video screen is set at 56 Hz ~ 75 Hz.

(Do not exceed 60 Hz when using the maximum resolution.)

5. If you have problems in installing the adapter (video) driver, boot the computer in Safe Mode, remove the Display Adapter at the "Control Panel, System, Device Administrator" and then reboot the computer to reinstall the adapter (video) driver.

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