Assessment of faulty pixels on LCDs

For:-

All LIFEBOOKs (names without hyphen, e.g. B2610, S6010, E7010, C1010)
All AMILOs: AMILO A, D, M (M newer than M-6300, M-7300 (EF3R))
All Celsius Mobile Workstations
Tablet PCs (from Stylistic ST4000 series on)
Pocket LOOX

For all older systems see Older systems

General information:

Some LCD displays can have some faulty pixels (e.g. ‘black spots’). Therefore, the following Fujitsu Technology Solutions criteria should be observed before deciding to replace the display.
This information is to be used to define whether the LCD panel defect is covered by the warranty for the product.

The standard of production techniques today cannot guarantee an absolutely fault-free screen display. A few isolated constant lit or unlit pixels may be present.
The maximum permitted number of pixels faults is stipulated in the stringent international standard ISO 13406-2 (Class II).

• For example a 15" flat-screen with a resolution of 1024 x 768 has 1024 x 768 = 786423 pixels. Each pixel consists of three sub pixels (red, green and blue), so there are almost 2.4 million dots in total. According to ISO 13406-2 (Class II), a maximum of 4 pixels and 5 sub pixels may be defective, i. e. a total of 17 fault dots. This corresponds to approx. 0.002% of the entire screen surface.

Fujitsu Technology Solutions Criteria

The pixel is defective if one or more of the dots can’t be controlled, i.e. the dot stays the same colour despite of desired colour and it is visible from 30 cm distance from the LCD panel surface. Typically such defects can be seen as bright spots on dark (black) background. The bright spot can be seen as bright white, red, blue or green.
When there is a bright, white background, the dot can be seen as a black spot.
The general criteria and criteria for each LCD panel type for an accepted amount of defective pixels is defined in the table below.

The manufacturing processes for LCDs almost invariably results in a small number of the pixels on LCD screens to be defective. This phenomenon is not confined to Fujitsu Technology Solutions but is common through the industry and there is a standard acceptance criterion for the number of defective pixels allowed.

LCDs should only be considered for warranty replacement if the number of defective pixels exceeds that stated in the following text.

Assessment of faulty pixels on LCDs.
The pixel is defective if one or more of the subpixels cannot be controlled, i.e. the pixel/subpixel stays the same colour despite of desired colour and is visible from a distance of 30 cm from the LCD panel surface. Typically such defects can be seen as bright spots on dark (black) background. The bright spot will be seen as bright white, red, blue or green.
When there is a bright, white background, the pixel will be seen as a black spot.

The general criteria, and criteria for each LCD panel type, for an accepted amount of defective pixels is as defined in the table below:

Sorted by LCD size:

Examples (14.1"):

Older systems

The first digit of the model term describes the display size of your Notebook, see the following table below.

Sorted by LCD size: