Ultrabrite 2 monitor HD/SDI inputs stopped working mid-shoot while SD/composite inputs remained functional

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2013Monitors forum

13 years old. Gear and prices may have changed since.

A monitor's HD/SDI inputs may stop recognizing video signals while still being detected during input scanning, even when the same monitor successfully displays video through composite inputs.
Testing with multiple video sources and cables, including direct camera-to-monitor connections, can help isolate whether the failure is in the monitor's HD/SDI inputs or in upstream equipment.
Down-converted SD video successfully displayed through composite inputs indicates the monitor's display and processing functions are intact, suggesting the problem is specific to the HD/SDI input stage.

The user did not test with a camera having native HD/SDI output, only with converted HDMI-to-SDI sources.
The failure occurred suddenly mid-shoot without obvious physical cause and was never resolved in the thread.
Only one monitor model was tested, so the issue may not generalize to other Ultrabrite 2 units or other monitor brands.