Depending on how new your direct tv box is they are most likely not compatible especially seeing as its hd I would assume its been made alot more recently than the remote I will however suggest looking at the owners guide for manual code entry it usually involves holding down a button or two and scrolling through frequencies until the appropriate action is taken being the item you wanted to prgram turns on or off and than saving that frequency it very time consuming and does not have a 100% success rate
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Depending on how new your direct tv box is they are most likely not compatible especially seeing as its hd I would assume its been made alot more recently than the remote I will however suggest looking at the owners guide for manual code entry it usually involves holding down a button or two and scrolling through frequencies until the appropriate action is taken being the item you wanted to prgram turns on or off and than saving that frequency it very time consuming and does not have a 100% success rate
Robb