HP ZBook 17 Maintenance and Service Guide - Page 174
Display Issue: Pixel Anomalies
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Display Issue: Pixel Anomalies All HP notebook displays adhere to strict quality and reliability specifications. A small percentage of display panels may have minor cosmetic manufacturing anomalies or irregularities such as bright or dark dots in the viewable area. These cosmetic imperfections are common to all display panel types and are not specific to any HP model or product line. All display panel defects should be examined at the highest possible resolution using both the brightest and darkest possible backgrounds, because some sub-pixel failures may 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 7-8 Electrical defect allowances Panel resolution Accept Reject Sub-pixel 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 sub-pixels with sub-pixel faults Not allowed Dim lines Not allowed Cross line(s) on/off Not allowed Horizontal line(s) on/off Not allowed Vertical line(s) on/off Not allowed NOTE: All LCD panel defects should be examined at the highest possible resolution using both the brightest and darkest possible backgrounds, as some sub-pixel failures may not be readily visible under certain conditions. NOTE: Contact support for assistance if issues are not listed. 160 Chapter 7 Troubleshooting guide