I have had my monitor for about one year and never a problem to day when I tried to use it it stayed black but power light was on so I turned it off and then back on and for a few seconds screen looked fine but quickly turned black again. I turned it of unplugged it check all conecctions but same thing every time. I tried a different monitor I have no problem with that one.
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Re: screen goes black
This indicates the LCD inverter in the display is dead. If you have any experience with computer repair, replacing an LCD Inverter can be easy enough; However, it may not be worth it for a 15" LCD; replacement inverters can cost anywhere between $15 and $40 - a decent used 15" LCD only costs about 40 bucks these days...
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Here is one thing you can do to help get to the root of your problem.
Take a flashlight and shine it on the screen once it has gone to black. If you are able to see the screen information (your desktop) then you have a back light problem.
The fact that the bulbs come on at first and then go dark tells me that it is probably not the bulbs themselves and the fact that your power led stays on tells me that it is probably not the power supply either.
The most likely cause is the power inverter board which is usually a separate board attached to the video mother board and it powers the back light bulbs.
This is not an easy fix for someone who is not familiar with LCD displays but it can be done. I did a Google search on Sony SDM-X73 (if that is your monitor) and could not find any stand out instances of complaints. I also did a eBay search and could not find anyone selling replacement boards either.
Truthfully, my solution for you would be to replace the monitor. It will probably cost you more to have someone work on the monitor and fix it than it is worth. You can find 17 inch flat panels on eBay or CraigsList for cheap these days and I just saw a brand new Acer 22" with a 3 year warranty on CompUsa.com the other day for $150.00.
You can try taking it apart if you want to but recycling it is the better option.
Yes, It sounds like the backlight inverter circuit is shutting down. No inverter power, no backlight. On some monitors the inverter circuit will shot circuit the power power supply which makes the power light flash on some it just kills the backlight. You can usually check with a flashlight. Hold the flashlight pointed at the screen and see if you can see any of the icons or background picture. If you can then it is the backlight circuit or backlight tubes, usually the circuit.
This could be one of two problems, the light in your monitor has a loose cable, or the light is dying. I have seen cold cathode lights that are about 10-15$ to buy and many instructions on putting them in yourself.
Solution 2, your cable is loose on the back of the monitor. Make sure you have the screws tightened on either side of the vga or dvi cable, both on the back of your monitor and on the back of your computer or laptop.
This happened to me and I was able to fix it. I cracked it opened and found a bad capacitor, bought a replacement at Radio Shack and I'm back in business. Actually using it right now to post this.
"Most" newer monitors will let you know if the are no longer receiving a signal. Sounds like the backlight is burnt out. Try getting a bright (LED works best) flashlight and shining it at the screen at all angles to see if you can see any of what you were doing. If the backlight is on the fritz, either return it on warranty or buy a new one.