HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 103

Display assembly diagram, Dead pixel, No video (internal)

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Display assembly diagram The display assembly diagram shows basic video components: system board, graphics cards, display cables, display connectors, operating system (OS), graphics driver, and LCD display panel. Any component or a combination of these components can contribute to a video issue. NOTE: The lid close switch is a Hall-effect sensor located in the top cover. When the display is closed, the sensor acts like a switch is closed. A notebook can force a video output to an external monitor, or go to hibernation or standby mode through power management. If the display screen does not light up when the display is open, the lid close switch (Hall-effect sensor) could be faulty. Dead pixel Display panel may show one or more pixels that are not properly lit when displaying a single color over the screen area. Use HP PC Hardware Diagnostics (UEFI) tool to determine those defective pixels. There is no solution for dead pixels. See Display issue: pixel anomalies on page 124 for the HP dead pixel policy. No video (internal) Use this information to troubleshoot video issues. Table 6-29 Issues, possible causes, and fixes Items Procedures Symptoms Possible causes No internal video with certain programs (for example, video­ intensive games) Display resolution, brightness, faulty lid switch, running a program requiring a higher resolution than the display screen can support. Faulty lid switch may put the system into Sleep or Hibernation mode. Troubleshooting steps Use an external monitor with higher resolution. Test with external monitor using HDMI or HP port. Press the power button and close the computer lid to force video output to external video. If there is still no video, contact support. References See section No video (with power) on page 81 for display information. 94 Chapter 6 Troubleshooting guide

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Display assembly diagram
The display assembly diagram shows basic video components: system board, graphics cards, display cables,
display connectors, operating system (OS), graphics driver, and LCD display panel. Any component or a
combination of these components can contribute to a video issue.
NOTE:
The lid close switch is a Hall-effect sensor located in the top cover. When the display is closed, the
sensor acts like a switch is closed. A notebook can force a video output to an external monitor, or go to
hibernation or standby mode through power management. If the display screen does not light up when the
display is open, the lid close switch (Hall-effect sensor) could be faulty.
Dead pixel
Display panel may show one or more pixels that are not properly lit when displaying a single color over the
screen area. Use HP PC Hardware Diagnostics (UEFI) tool to determine those defective pixels.
There is no solution for dead pixels. See
Display issue: pixel anomalies
on page
124
for the HP dead pixel
policy.
No video (internal)
Use this information to troubleshoot video issues.
Table 6-29
Issues, possible causes, and fixes
Items
Procedures
Symptoms
No internal video with certain
programs (for example, video±
intensive games)
Possible causes
Display resolution, brightness, faulty lid switch, running a program requiring a higher
resolution than the display screen can support.
Faulty lid switch may put the system into Sleep or Hibernation mode.
Troubleshooting steps
Use an external monitor with higher resolution.
Test with external monitor using HDMI or HP port. Press the power button and close the
computer lid to force video output to external video. If there is still no video, contact support.
References
See section
No video (with power)
on page
81
for display information.
94
Chapter 6
Troubleshooting guide