I think I can help you with this one :-)
Your remote is likely still paired to the old board. SO, you need to re-pair the remote.
You can do that by holding down the Back and Home buttons (it may be another combination, depending on which remote you have, I'm not familiar with your model number .. it's always the two buttons above nearest the center OK button, that aren't the directional keys) for approximately 5 seconds or so. On most of the remotes, this will cause the light on the remote to blink a few times, then stay lit. Some of the models, it doesn't stay lit. But, once you've done this, press OK, and it should take a few seconds to pair it to your new board.
Good luck! Enjoy!