HDMI to RCA cable is designed to connect and transfer signals from HDMI port to RCA port. With out converter box.
This cable functions as a signal transmitter, but NOT a signal converter. As HDMI carries digital signals while RCA carries analog signals.
In order for these two formats of signal to communicate with each other, both input and output devices needs to support the signal conversion function (code and decode), please kindly check with your user manual.