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The most common thing that causes no power or a blinking power light and no picture is a failure of the power supply board. The board can be repaired and the monitor will be as good as new. To repair the board you just need to replace a few parts called capacitors. Here is a link to repair information on the Westinghouse LCM-19V5
If the monitor turns on and goes directly to sleep, or it powers on briefly and shows an image then goes black then the monitor is defective. The first is often an I/O panel issue inside of the monitor. The second is typically a lamp failure within the monitor.
A simple test would be to plug a different monitor into your computer or this monitor into another computer. If the monitor doesn't work on another computer or a different monitor works on the same computer then the monitor is the issue.
If the different monitor does not work on the same computer or this monitor does work on a different computer then something on the computer is to be suspected such as a driver issue or a faulty video card.
If you find the monitor is defective then you should dispose of it (assuming it is not under warranty) at a nearby recycling center and purchase a new monitor. I would suggest something by Acer, Samsung, Dell, HP, NEC, or Viewsonic. These brands cost a bit more, but have much better track records.
it seems to be an issue with your monitor's backlight not working properly. Just to be sure, try using a different monitor on the same exit of your VGA, if that works, my supposition is confirmed. In case your monitor is still under warranty, just send it to Westinghouse support center, otherwise I'm afraid you will have to buy a new one.
Hope it helped,
The internal power supply in the monitor is about to die. This is a very common problem with LCD monitors after 2-3 years of use. Check out the pages on monitor repair at our site: www.ccl-la.com We have the parts you need to do the repair and we will have a repair guide posted for your monitor by tomorrow night 01/06/2010. If you can solder then you should be able to do the repair yourself, it involves changing about 5 parts and a little soldering. If you don't want to do the repair, we do offer repair services. You can get more details at our web site.
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mufdvr6942, the "switch-mode-power-supply" is in shutdown. Have a technician evaluate (inspect) it. Do that if monitor is less than 4yrs old.
Also visit youtube and search and view longer (8-12min) vid clips of LCD monitor disassembly or LCD repair FYI 12fixlouie
Quickest fix for this is probably to temporarily unplug the monitor power cord.
For your other outages, I assume the monitor is connected to a computer, make sure the operating system power-save features have not disabled the video output signal from the computer ... if so, monitor should re-activate when you use the mouse or hit a key on the keyboard.
If your computer has two video outputs, make sure the primary display hasn't been shifted to the other one ... try it by moving the LCD data cable to the other video connector on the computer.