HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 106

Incorrect or missing color/distorted image, Touch screen

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Incorrect or missing color/distorted image Use this information to troubleshoot image issues. Table 6-33 Issues, possible causes, and fixes Items Procedures Symptoms Possible causes System works normally but the display shows: ● Missing or strange color ● Image distortion Loose connection, display cable, display, graphics card. Troubleshooting steps Verify with external monitor 1. Use combination fn + f4 to enable output to external monitor. 2. Close the lid. If the external monitor also shows incorrect color, it is graphics card issue. Test with a verified working graphics card. Verify monitor cable and cable connection (Monitor disassembly is required.) Be sure the monitor cables are not pinched or damaged. Be sure the monitor cables have good connection at both ends (system board and display panel). ● If moving cables affects the image, the monitor cable is the cause of the issue. Test with a confirmed working cable. ● If moving cables does not affect the image, the monitor has an issue. Test with a confirmed working monitor. Touch screen Use this information to troubleshoot touch screen issues. Table 6-34 Issues, possible causes, and fixes Items Procedures Symptoms Possible causes Unresponsive Dirt and smudge, driver, touch display configuration, power management. Inaccurate Troubleshooting steps Quick check Turn off the computer, spray glass cleaner onto a soft, damp cloth, and gently wipe the screen to remove dirt and smudge. NOTE: Do not spray cleaner directly onto the screen. Configure the touch display in Control Panel > Tablet PC Settings 1. Restart the computer. 2. Verify touch screen and graphics drivers. 3. Configure the touch display to identify the screen as a touch screen as shown in the image at left. Incorrect or missing color/distorted image 97

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Incorrect or missing color/distorted image
Use this information to troubleshoot image issues.
Table 6-33
Issues, possible causes, and fixes
Items
Procedures
Symptoms
System works normally but the display
shows:
●
Missing or strange color
●
Image distortion
Possible causes
Loose connection, display cable, display, graphics card.
Troubleshooting steps
Verify with external monitor
1.
Use combination
fn + f4
to enable output to external monitor.
2.
Close the lid.
If the external monitor also shows incorrect color, it is graphics card issue. Test with a verified
working graphics card.
Verify monitor cable and cable connection
(Monitor disassembly is required.)
Be sure the monitor cables are not pinched or damaged.
Be sure the monitor cables have good connection at both ends (system board and display
panel).
●
If moving cables affects the image, the monitor cable is the cause of the issue. Test with
a confirmed working cable.
●
If moving cables does not affect the image, the monitor has an issue. Test with a
confirmed working monitor.
Touch screen
Use this information to troubleshoot touch screen issues.
Table 6-34
Issues, possible causes, and fixes
Items
Procedures
Symptoms
Unresponsive
Inaccurate
Possible causes
Dirt and smudge, driver, touch display configuration, power management.
Troubleshooting steps
Quick check
Turn off the computer, spray glass cleaner onto a soft, damp cloth, and gently wipe
the screen to remove dirt and smudge.
NOTE:
Do not spray cleaner directly onto the screen.
Configure the touch display in
Control Panel >
Tablet PC Settings
1.
Restart the computer.
2.
Verify touch screen and graphics drivers.
3.
Configure the touch display to identify the screen as a touch screen as shown
in the image at left.
Incorrect or missing color/distorted image
97