Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

Rca to hdmi converter hookup to roku

I have a old tv and I have a roku express I bought a rca to hdmi converter and hooked everything and all my tv is showing is blue video screen I'm in Florida usa can someone please help me out with this issue am I doing something wrong I was told by best buy store that this is how to get it to work on old tv was the RCA TO HDMI CONVERTER BOX?????