Marshall V-LCD70XP-3GSDI monitor not recognizing SDI signal from Red MX camera

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2014Monitors forum

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

A Marshall V-LCD70XP-3GSDI monitor failed to detect SDI signals directly from a Red MX camera across multiple SDI ports, but the signal passed through successfully when routed via a Switronix Recon Ultra before reaching the monitor.
The same SDI signal worked when connected directly to another monitor, suggesting the issue was specific to the Marshall display rather than the camera output.
The Red camera outputs a progressive signal format rather than PSF, which may be relevant to signal recognition issues.
Ground issues on video connections can cause signal recognition failures.

The reported issue was from 2014 and specific to one camera and monitor combination.
No resolution was documented in the discussion.
The cause remained unconfirmed, with only hypotheses offered.