Some suspect pixels, whether white, black, or discolored, can be restored by lightly rubbing the panel.
1. Locate the suspect pixel on the LCD panel.
2. Using a clean, soft cloth, lightly tap the pixel.
3. Using the cloth, apply light pressure to the pixel and rub in a circular motion around the pixel
Regd this I have a LG LCD flatron model no L1720B n I've got a similar problem only here these dead pixels seem to be increasing daily... every day when I switch on the monitor, the black line has grown, I dont know how to stop this from happening... Do u guys know if LG has a lifetime warranty for the screens ? I bought this monitor 3 yrs back n the guarantee period is over...