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If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on: Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/ Post back what you see inside so we can guide you further and it will help out other people in the future also.
You have a power supply that is about to die.
If you can solder you should be able to repair the monitor yourself.
The problem is caused by blown capacitors on the power board. Go to our
web site at : www.ccl-la.com/badcaps.htm
We have pictures of what to look for. Open your monitor and look at the
power supply board for any blown capacitors, replace all that you find.
The replacement parts can be ordered from several places on the
internet or we can supply them for you. The replacement parts will need
to be high temp and will be marked 105c. The values you need to get
will be marked on the sides of the ones you take out but will be
something like 220uf, 470uf, or 1000uf etc. and then a voltage rating.
When you install the new ones be sure to insert them with the polarity
stripe going the same direction as the old ones come out. If you don't
want to do the repair yourself we do offer a repair service for $35
plus return shipping. If you have any questions just let us know
Had a Sceptre DCL9A model for mine. There are plastic snaps which hold the back and front covers together. After I took off the screws and detach the monitor stand, I slid a very small flat head screw driver along the sides until I found each snap. They should come loose easily with a slight twist of the screwdriver. There are about 5 on each side of the monitor (not counting the monitor). Do not try to force it as you can warp or crack the plastic.
Check with www.lcdrepair.net if you want a repair. Something is wrong with your backlight or the circuit supplying power to it. If your technically endowed, you may want to open the monitor case and clean the dust and lint from around the circuits using a Small paint brush to sweep away any built up dust. Dust can cause the circuitry to heat up faster and put the power supply into Clamp mode. Clamp mode will turn the supply off to certain circuits which may be the reason your display is going black after 5 minutes.