My monitor was on, and I was using the computer; I walked away and when I returned, I saw that my screen was black. My first thought was that the power had failed. I checked the power supply and there was no problem. There was no power problem. I turned the power on and off, it made the normal startup sound, and I could log in, from memory, I know the procedure. I checked the connection and power and outside for obvious damage, I cannot find a reason. Another monitor connects to the computer and works successfully.
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First of all go for monitor self test. disconnect your monitor cable from the back of ur CPU and turn on ur monitor, if you see some colour(red, blue, green etc) boxes in any shape
that means your monitor is fine, make sure colours are not hazy. If this succeeds that check the pins of the monitor connector, make sure pins are not bent or broken. Just Give it a try ... Cheers!!
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Could be a hardware issue, If the screen has a power light, does it change coulor (often green to orange) when the problem happens. If so its the screen inst getting any signal. It could be a connector or cable.
The problem could be in the Monitor, Computer or Cable. Did you try to connect another monitor or can you try to connect another computer (maybe a laptop) to that monitor?
It's important to understand where to start.
It's very likely that the LCd "inverter" is bad. This is a module that provides the high voltages needed to light the 4 cold-cathode lamps that provide the white backlight.
Search for other samsung problems with inverter and you should find several. The one I saw was for 17" LCDs and the 204T is probably using a different module.
Should be able to find replacement online, but be prepared to take the monitor back cover off, with tiny screws and connectors.
Take a flashlight and shine it at the LCD screen while after it goes black. If you can see the screen images still then your backlight is the problem.
Let us know what the results are and please don't forget to rate this post.