I just purchased a Flatron L1919 monitor 2 days ago and notice that once a second, all the colors(particularly the darker colors/black)seem to "pulse". Its distracting and giving me a headache but I can't seem to figure out what's causing the pulsing. I have it set at the required settings (60HZ, and 1280X1024) so its puzzling what's cauing this pulsing- is it normal for flat panel monitors to do this?
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If you get half of the screen darker, remember that LCd monitor have 2 neon lamp at each extremity of the LCD, when one goes out you get this problem. it is possible to replace the LCD neon lamp, I did it many time, but you need to tear all the monitor appart and be carefull not to break any glass while doing so.
Thin screen LCD monitor brightness controls operate several fluorescent lamps called "backlights" that are positioned behind the LCD display. Typically, they're located around the edges of the screen - sometimes just at the top and bottom, and other times at the left and right edges and others still at all 4 edges.
The lamps are miniature versions of those sold in stores. They require a support circuitry called an inverter that convert & boosts the level of DC to AC voltage performing the functions of a ballast in a traditional fluorescent fixture.
The reason a part of your screen remains dark is because one or more of the components in the picture above has failed and will not allow the lamp to shine. Replacement lamps and inverters aren't expensive - but requires patience and the ability to disassemble / assemble the monitor (which is usually harder to do than it appears) and solder. They are available various lengths and color temperatures (you must get a lamp that is identical or it will be noticed). If this is a new monitor - you ought to return it for replacement. If used, consider the cost of purchasing a replacement (new or used) vs. repair.
Plug a spare monitor in the computer to see if works, if it does! the LG monitor has issues and not cost effective to have it repaired. A final thought! make sure the power and video cord are snug tight on both ends of the LG monitor. If the same problem persists in both monitors, the computer has a Video Graphics Card issue.
It sounds like your backlight isn't working properly. LCD screens have backlights that illuminate the colors produced upon their surfaces, so that you can easily see the screen without an external light source. In your case, it sounds like your backlights either aren't cailbrated, are damaged, or were produced unevenly.
There is most likely not a fix for this, though most all LCD screens have some form of light distortion. My own LCD screen is slightly brighter around the edges, where the backlights are located, but this is only noticeable when displaying a completely black screen.
Same problem started happening two days ago and ever since. I called LG and the product falls under a 3yr product warranty according to them (from my original purchase date of January 20, 2007). They will send packing slips to me so I can send the defective unit back to LG. I was told I am eligible for a replacement monitor - which will be shipped to me within 10 to 14 days (consecutive days, not business) - although I'm not sure what I'm being sent in return. My suspicion is that this monitor issue is a known issue by LG and they are quietly replacing the unit to those who follow through by calling CS.
Tips: Have your original purchase date on hand (in the form of a receipt) just in case they want proof of purchase.