When dealing with HDMI video distribution systems such as Matrix Switchers, Extenders, AV over IP, or Distribution Amplifiers, occasional issues are inevitable. You may complete an installation with everything working perfectly, only to receive a call days later reporting that the video has stopped working. In many cases, the culprit is a failure in the HDMI handshake—the communication process between devices to establish a stable connection.
To help you resolve these problems efficiently, we’ve compiled a step-by-step troubleshooting guide. These tips, based on real-world experience, will help you identify and address handshake issues effectively.
What Is an HDMI Handshake?
An HDMI handshake occurs when two connected devices—such as a source (e.g., Blu-ray player) and a display—exchange and agree on essential communication protocols, such as video resolution, audio format, and HDCP (High-Bandwidth Digital Content Protection). When this handshake fails, the result can be a blank screen, flickering video, or no signal.
Troubleshooting HDMI Handshake Issues
Here are practical steps to help you identify and solve HDMI handshake problems. Follow these systematically:
1. Check HDMI Cable Length
• Ensure your HDMI cables are at least 2 meters long. Extremely short cables can cause signal issues.
• Replace any cables that are too short or appear damaged.
2. Inspect Category Cables for HDBaseT Connections
• Use a trusted patch cable to test all HDBaseT connections.
• Avoid using EZ Ends, keystone jacks, or punchdown blocks in your connections.
• Ensure you’re using high-quality cables, such as CAT6a or better.
3. Unbundle Category Cables
• If you’re running multiple category cables, make sure they’re not bundled together. Bundled cables can cause interference, leading to HDMI handshake issues.
4. Step-by-Step Elimination
• Bypass each component in the video distribution chain (e.g., sources, switchers, extenders, and displays) one at a time.
• Record your results to pinpoint where the handshake issue occurs.
5. Check Cable Distances
• Verify that your category cable distances comply with specifications. For example, if you’re using CAT5 or CAT5e instead of CAT6a, reduce the maximum distance by 25%.
6. Update Firmware
• Ensure all devices, from the source to the display, are running the latest firmware. HDMI technology evolves rapidly, and outdated firmware can cause compatibility issues.
7. Lower the Resolution
• Temporarily reduce the resolution to see if high bandwidth requirements are causing the issue. Lowering the resolution can help identify bandwidth bottlenecks.
8. Use AVPro Edge and Murideo Tools
• Consider using AVPro Edge’s reliable video distribution equipment to minimize handshake issues. Their advanced solutions are designed to handle high-performance installations.
• Use the Murideo Fox & Hound troubleshooting tool to test signal integrity, identify problems, and ensure your system is operating correctly.
Pro Tips for Preventing HDMI Handshake Issues
• Follow the HDBaseT Installer’s Ten Cable Commandments for best practices. These guidelines ensure optimal performance and reliability in your installations.
• Use quality components and cables from trusted manufacturers.
• Always test the system thoroughly before leaving the installation site.
Final Thoughts
HDMI handshake issues can be frustrating, but a methodical approach to troubleshooting can save you time and effort. By following these steps, you’ll be better equipped to identify and fix the problem, ensuring a smooth and reliable video experience for your clients.
Remember, HDMI is a constantly evolving technology. Staying updated on best practices, firmware updates, and utilizing tools like AVPro Edge solutions and the Murideo Fox & Hound will make you a more skilled and efficient integrator.
By - Jay Singh