How are you connecting the two components? The HVX200 does not have SDI outputs. It does have both SD and HD analog outputs through the component cable. The “yellow” RCA jack is SD analog only. Is your other device set for analog input? You mention that it works with SDI but is it set up for composite analog as well? If you are going out of the component cable on the HVX200, is the output set for composite SD and not HD in the camera menu?
Can you explain your setup in a bit more detail?
E=MC2+/-2db