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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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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.
Checked electronics. No bad capacitors.
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.
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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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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