What the thread found

• The Decimator MD-HX does not output composite video, only SDI, which makes it unsuitable for composite-only monitors like the Flyer.
• The Decimator2 or AJA converters are recommended alternatives that can downconvert HD/SDI to composite output.
• When troubleshooting video signal problems, bypass the rig entirely and connect the monitor directly to the downconverter to isolate whether the issue is with the converter, cables, rig wiring, or the monitor itself.
• Testing with a different monitor that accepts standard definition composite input can help determine if the downconverter is producing a valid signal.
• For cameras with HDMI output like the A7S II, the HDMI resolution should be set to 1080p for compatibility with conversion equipment.
• A budget alternative is a simple HDMI to RCA composite converter box available from online retailers for approximately $25, though quality and reliability may vary.
• Some converters like AJA units can both downconvert and split the HD signal for multiple outputs.
• If direct connection from downconverter to monitor works but going through the rig does not, the problem may be in internal rig wiring or connectors in the top stage.
• For cameras without HDMI downconversion capability, routing through an intermediate converter like a Small HD monitor that outputs SDI can provide a workaround.

Depends on

• The original poster did not complete testing to determine whether the equipment was faulty or the setup was incorrect.
• Specific compatibility details for the Flyer monitor were not confirmed in the thread.
• The budget converter solution from Amazon was mentioned anecdotally without detailed testing results.
• The troubleshooting advice assumes standard equipment and may not apply to unusual rig configurations.

Parts

Top Stage

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