VTG228 plus video titler help

Hello there, I wanted to post this to see if anyone could be of help, I bought this VTG228 video titler but can’t figure out how to work it, all the videos I have seen show some kind of box grid and I can’t get that to appear. Im not sure if it is broken but the seller tested the item before selling it. I wanted to know if anyone has any advice, I’ve tried multiple cables for the input/output and everything seems ok but it seems like the keyboard buttons aren’t responding, any information helps I really don’t want to have to return this item.

![image|375x500](upload://vG5c9TRSTh8mirIr5HGmVkA3yNw.jpeg


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