HP ZBook 17 Maintenance and Service Guide - Page 144
No or bad external video via docking, Incorrect or missing color/distorted image
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No or bad external video via docking Items Symptoms No or bad image on external monitor via ports of docking station (VGA, DP, TB, display port, etc.) Note Procedures Possible causes Rooted from system board, software/drivers, dock connectors, docking station hardware/ firmware, dock video ports (DP, VGA, etc). Troubleshooting steps 1. Be sure that external monitor is powered on. 2. Be sure that external monitor is compatible with the computer. 3. If applicable, plug the dock in different Type-C ports. For more information, see the technical white paper titled "HP ZBook 65/150/200 W Thunderbolt 3 Dock User Guide." Go to http://support.hp.com/, enter your model number, and then click Manuals > Technical white papers. 4. If the screen image is distorted, try a DP-to-VGA adapter. Connect the adapter to each DisplayPort and VGA port of the dock. 5. Test the monitor via internal ports (VGA, DP, HDMI, etc.). 6. Verify that dock connectors of the notebook and the dock are clean, without dust, debris (e.g., using air duster). 7. Ideally, use a verified working operating system/system connected to the dock to isolate the issue of the current operating system. 8. Ideally, use a verified working docking station to isolate the faulty dock. 9. Update latest dock firmware. Be sure to follow the installation instructions carefully. You may want to try a DP-to-VGA adapter if you have a distorted screen image. Connect the adapter to each DisplayPort of the dock. If you still cannot update the dock, attempt to update it on a confirmed working notebook before having the dock replaced. See the technical white paper titled "Multiple displays on HP ZBook Mobile Workstations" from HP platform support website. Go to http://support.hp.com/, enter your model number, and then click Manuals > Technical white papers. Incorrect or missing color/distorted image 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 (i.e., VGA) 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 display cable and cable connection-Display disassembly is required. Be sure that external display cables are not pinched or damaged. 130 Chapter 7 Troubleshooting guide