dark dots in the viewable area. These cosmetic imperfections are common to all display panel types, not
specifically HP products.
All display panel defects should be examined at the highest possible resolution using both the brightest
and darkest possible backgrounds, because some subpixel failures might not be readily visible under
certain conditions.
● Type 1: Bright dot on a dark background = Always On
● Type 2: Dark dot on a bright background = Always Off
● Combination = in any combination and any color that are always on or off
Use the HP PC Hardware Diagnostics (UEFI) tool to determine numbers of pixels and their distance. HP
uses the following set of criteria when damaged displays are submitted for warranty coverage.
Source: http://support.hp.com/us-en/document/c00035844
Table 7-57
Electrical defect criteria
Panel resolution Accept Reject
Subpixel faults
VGA, SVGA, SD, WSVGA, XGA, 720p, SD+, WXGA, HD N ≤ 2 Type 1
N ≤ 2 Type 2
N ≥ 3 Type 1
WXGA+, SXGA+, HD+, SXGA+ N ≤ 3 Type 1
N ≤ 3 Type 2
N ≥ 4 Type 1
WSXGA+, UXGA, FHD, WUXGA N ≤ 4 Type 1
N ≤ 4 Type 2
N ≥ 5 Type 1
QHD, QHD+, WQXGA, UD N ≤ 5 Type 1
N ≤ 5 Type 2
N ≥ 6 Type 1
Electrical defect clusters (defects within a 5x5 pixel block)
Minimum distance between ANY allowable defects (unless otherwise specified) S ≥ 25 mm S < 25 mm
Cluster with 2 or more subpixels with subpixel faults Not allowed
Dim lines Not allowed
Cross lines on/off Not allowed
Horizontal lines on/off Not allowed
Vertical lines on/off Not allowed
NOTE: Examine all LCD panel defects at the highest possible resolution using both the brightest and
darkest possible backgrounds, because some subpixel failures might not be readily visible under
certain conditions.
NOTE: Contact support for assistance if issues are not listed.
Display issue: pixel anomalies
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