Monitor goes blank after being on for a little bit.
Sometimes there is no problem for several days, sometimes you only get an hour or two before the monitor goes blank. You can turn the monitor off and on again but it will go blank again within seconds. What is causing this? Should I fix or replace?
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fs31, Hi, I'm 12fixlouie. Will need more info about your Lucky Goldstar unit before I can give you advice on your "sometimes" black or blank n black screen monitor. What is model nuumber and when was it made? Is pc fully functional with spare monitor connnected? Did this problem just happen? Is unit covered by LG warranty? Did LG display work perfectly the day before? Do you know how to do the flashlight test when screen goes to black? Read my fixya profile for a little bit to understand the top two causes of ccfl backlit lcd monitor failure modes. Then do additional post on fixya and let us know what you are willing to do about your display. Your monitor's smps/ccfl inverter supply may need refurbishment (rebuild) because of common known problem affecting ALL brands of lcd monitors!!! Do your research first!!! Reading is free. Then come back here and rate this response if you learned something and feel this was helpful. 12fixlouie
is your CPU working properly? if that the case, your monitor is in need of a service.
reasons for why a monitor goes blank? Reason 1: Wetness
The number one reason why computer monitors go blank is - wetness. Believe it or not, when your computer monitor is exposed to humid air, sometimes water can condense and accumulate in the monitor. This causes the monitor to malfunction and go blank. I've had this happen to my desktop PC at least three times before. What you need to do is to leave the monitor alone for some time and allow the water to evaporate. That usually solves the problem.
Reason 2: Faulty Graphics Card
The next reason why your computer monitor goes black is due to a faulty graphics card. The best way to detect this kind of problem is to connect up a new monitor to your PC, then check if you have a blank screen. If you continue to have a blank screen, then it's likely your video card is faulty.
Reason 3: Faulty RAM
This one is less obvious and less common, but it can happen. You might sometimes get bad RAM modules which prevent your PC from booting up even to the basic BIOS startup screen. To detect this kind of problem is more troublesome, you might need to remove those RAM modules and insert them into another computer.
Reason 4: Loose Connections
Another reason why your monitor goes blank is due to loose connections. The connection from the monitor to the mains is usually a culprit, as is the connection between the monitor and the video card. Check those connections before you declare your computer monitor as faulty.
Reason 5: A Short Circuit In The Motherboard
And the final reason why your computer monitor goes blank? It's possibly because of a short circuit in the motherboard. This is the most undesirable outcome of course, as you might have to replace your entire motherboard. However, it's possible that this can happen - so keep your fingers crossed and hope it doesn't happen to you.
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if the monitor works fine on your laptop, the problem definitely is at the computer, possibly with the video card (if it is using one). it could have loose connection, or parts might have damages. it seems the problem is intermittent so electronic component of the video card could have parts partially damages or leaky components. if your still using the motherboards built in video out put, try installing a new video card.
Two possible causes are bad capacitors or a bad light inside the LCD panel.
Open the unit and check to see if any of the capacitors in the power supplyor other boards look domed or vented on the top.
Replace any capacitors accordingly. Monitor should work fine after that.
If not try checking the surface-mount transistors on the inverter board
that run the lights. Some times these transistora go bad. Also, you may
have a bad light inside the panel. This is tough to test without a
spare light to use for troubleshooting the panel lights.
You can take the panel apart and inspect the lamps but it is very
tedious. It's tough enough to get them apart and back together again
never mind keeping the layers clean. You have to try not to get any
dust between the layers or you will see it in the picture.
There's usually two light fixtures each of which holds two lamps. One
fixture at the top and one at the bottom. Remove them one at a time and
inspect the lamps to see if any are broken or very dark on the ends. If
one looks out of place, it could be bad.
You'll have to find replacement lights on the net. It's not easy to
replace them, but if you've gone this far, good luck. You should be
able to get generic instructions off of the site that sells the lamps.