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Repair guides and support for computer monitors produced by Samsung.

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Monitor turns black after a few minutes

This Samsung Syncmaster 940NW monitor works fine except for the fact that it turns black after a few minutes. A few minutes means: 5, 10, 15, 20 or whatever minutes it likes to stay on. What could be the cause for this blackout?

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did you do a backlight test? is there any video?

Any problem associated with a time to react must have a heat component. Any component can do that, so starting with the easiest to test is the way to go.

Black screen - backlight test. then capacitors, then voltage checks, then it gets difficult and becomes a board swap process.

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John Van Dael check your power supply for bad capacitors. It sounds like you are losing either your backlight or total power.

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THX Oldturkey. I will check this out as soon as I have time.

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Checked electronics. No bad capacitors.

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If the capacitors are the course of the problem, would the screen go back to normal within 5-10 minutes. Or is it more likely the screen stays black.

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I am using this monitor (Samsung Sync Master 940NW) for more than one year. Since a month the screen stays black after switching on my pc. I am using two monitors, so I am able to work, but some frames start at the SyncMaster and so I am not able to continue. The issue takes 5-10 minutes.
The manual can be found here:

https://www.samsung.com/nl/support/model...

This manual suggests a relation with the power setting:

PowerSaver

This monitor has a built-in power management system called PowerSaver. This system saves energy

by switching your monitor into a low-power mode when it has not been used for a certain amount of

time. The monitor automatically returns to normal operation when you press a key on the keyboard. For

energy conservation, turn your monitor OFF when it is not needed, or when leaving it unattended for

long periods. The PowerSaver system operates with a VESA DPMS compliant video card installed in

your computer. Use a software utility installed on your computer to set up this feature.

State Normal Operation Power saving mode

Power off

(Power button OFF)

EPA/ENERGY 2000

Power Indicator Blue Blue Blinking Black

Power Consumption Less than 20 W Less than 1 W Less than 1 W

This monitor is EPA ENERGY STAR® compliant and ENERGY2000

compliant when used with a computer equipped with VESA DPMS

functionality.

As an ENERGY STAR® Partner, SAMSUNG has determined that this

product meets the ENERGY STAR® guidelines for energy efficiency.

I changed some settings without any result.

My temporally work around was changing to one monitor and extend it later on when the SyncMaster is working normally.

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John Van Dael さん、ありがとうございました!
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