Old Tv Need To Hook To HDMI

Crystal B

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Jun 4, 2015
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we have an old tv .... the box we have for our cable takes HDMI hook up... so is there a way i can hook my old tv (it only has the round thing in the back and only one)and make it to hook up to HDMI is there a convertor or something or do i just need to return my box?
 
Is the "round thing in the back" threaded like this or smooth like this ??

If it is threaded, then that is a coax connector and the TV requires an RF (radio frequency) signal input.
If it is smooth, then it is an RCA connect and the TV requires a composite video signal input.

In either case you will need to buy a converter box if you want to use HDMI as the source.