I have Hitachi tv & my rca converter won,t work ?

This TV does not have HDMI sockets located on the TV you would need a converter from RCA to HDMI which are quite expensive around £70 an example is below
https://www.amazon.com/HDMI-converter-composite-video-audio/dp/B074MCX7VX

connect antenna to amp to converter to tv

RCA converter box remote control have no set-up code to Coby.

If you wish to get more details; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Common codes to check devices with different brand TVs are given, in the order of the device's brand name list in alphabetical order. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://remotesearch.blogspot.com/
http://electrohelponline.blogspot.com/

www.rcaaudiovideo.com/.../?sku=&productType=Digital+TV+Converter+Box here is the manual

You can't, at least not directly. Older sets don't have any HDMI inputs, only composite video (the yellow RCA jack) and possibly component video (red, green and blue RCA jacks). Converters that take an HDMI input and generate the necessary video outputs are available, but they aren't cheap. And don't fall for the adapter cables you might find advertised with an HDMI plug on one end and RCA plugs on the other that supposedly convert the signal for you. HDMI can only be converted with some active electronics; a simple cable just won't work. If you want to hook and HDMI-only device to your old Hitachi, you'll need the converter.

Yes your going to need to take that back there has been issues with that converter box and remote so yes wlmart has a fantastic 90 days no questions asked return policy so please do yuorself a favor not that this easy a easy way out for me its not as there is not much more diagnosis then that.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

Already found solution with codes from Orian that worked.

Thanks

the suggestion to my guess is right,audio input to the line out jack on tv for it too work you would need the head phone jack witch would go in to auido in an split to RCA Audio out (TV) Witch meaning, adapter to convert regular RCA type (red/white) connectors to a standard mini plug (Headphone type) Hope it Works