Dead Pixels on ALDI Medion 17"

you are far more likely to have dead pixels in an LCD monitor than you are with a CRT monitor. Very few manufacturers guarantee that desktop or notebook LCD panels will be perfect. Some pixels on a brand-new LCD screen could be dead, and show as black spots, or can be stuck on one colour (red, blue, or green), or even be stuck on one level of brightness, and so appear brighter or dimmer than the surrounding pixels.

Most LCD monitor manufacturers have a policy on the percentage of dead pixels that are allowed to get through their quality control procedures. More dead pixels are usually considered acceptable around the edges of the screen than in its centre.

You are advised to find out what the manufacturer of an LCD monitor's policy is concerning dead pixels before you make a purchase. The manufacturer will refuse to repair or replace an LCD monitor if the number of dead pixels doesn't comply with its policy concerning them. The problem is that the dead-pixel policy is usually not published, so you might have to go to some trouble to find out what it is.

Most of the major LCD monitor manufacturers adhere to the Class II section of the ISO 13406-2 standard that sets a policy on dead pixels. Under this standard, before an LCD monitor can be classified as being faulty, it has to suffer from one of the following faults:

1. - Two unlit pixels

2. - Two always lit (white) pixels

3. - Five red/green/blue pixels

4. - Two red/green/blue pixels in close proximity.

However, note that different manufacturers can interpret the ISO standard in different ways. For instance, one manufacturer might replace an LCD monitor if the two unlit pixels are at the edge of the screen, but another manufacturer's policy on dead pixels might not regard that as a fault that warrants a replacement.

It sounds too bad for them to ignore.