Philips 150P4CG, Service Manual

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14 150P4 LCD
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Definition of Pixel Defects
0. General
This section explains the different types of pixel defects and
defines acceptable defect levels of each type. In order to qualify
for repair or replacement under warranty, the number of pixel
defects on a TFT LCD panel must exceed these acceptable levels.
1. Definition of Pixels and Subpixels
A pixel, or picture element , is composed of three subpixels in the
primary colors of red, green and blue. Many pixels together from
an image. When all subpixels of a pixel are lit, the three colored
subpixels together appear as a single white pixel. When all are
dark, the three colored subpixels together appear as a single black
pixel. Other combinations of lit and dark subpixels appear as
single pixels of other colors.
2. Types of Pixel Defects
Pixel and subpixel defects appear on the screen in different ways.
Bright dot defects
Bright dot defects appear as pixels or subpixels that are always lit
or "on" . These are the types of bright dot defects:.
One lit red, green or blue subpixel
Two adjacent lit subpixels:
- Red + Blue = Purple
- Red + Green = Yellow
- Green + Blue = Cyan (Light Blue)
Three adjacent lit subpixels
(One white pixel)
Black dot defects
Black dot defects appear as pixels or subpixels that are always
dark or "off" TThese are the types of black dot defects:
One dark subpixel
Two or three adjacent dark subpixels
3. Pixel Defect Tolerances
In order to qualify for repair or replacement due to pixel defects
during the warranty period, a TFT LCD panel in a PHILIPS flat
panel monitor must have pixel or subpixel defects exceeding the
tolerances listed in the following tables.
Pixel
Subpixel Subpixel
Subpixel
BRIGHT DOT
DEFECTS
ACCEPTABLE LEVEL
MODEL 150P4 150B4 150S4
1 lit subpixel None None 8 or fewer
2 adjacent lit subpixels None None 3 or fewer
3 adjacent lit subpixels
(one white pixel)
None None 1 or fewer
Distance between two
bright dot defects*
None None 15 mm or more
Bright dot defects within
20 mm circle
None None 3 or fewer
Total bright dot defects
of all types
None None 8 or fewer
BLACK DOT DEFECTS ACCEPTABLE LEVEL
MODEL 150P4 150B4 150S4
1 dark subpixel 4 or fewer 4 or fewer 8 or fewer
2 adjacent dark
subpixels
1 or fewer 1 or fewer 3 or fewer
3 adjacent dark
subpixels
None None 1 or fewer
Distance between two
black dot defects*
15 mm or
more
15 mm or more 15 mm or more
Black dot defects within
20 mm circle*
3 or fewer 3 or fewer 3 or fewer
Total black dot defects of
all types
4 or fewer 4 or fewer 8 or fewer
TOTAL DOT DEFECTS ACCEPTABLE LEVEL
MODEL 150P4 150B4 150S4
Total bright or black dot
defects of all types
4 or fewer 4 or fewer 10 or fewer
Note: 1 or 2 adjacent subpixel defects = 1 dot defect
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