Hi, Joe. With the assumption that having the remote to set the video inputs will solve your issue, I went off trying to find the remote control codes for the JVC to input into your Harmony remote. I've searched for a while, but I haven't found a listing of the remote control codes for that unit. They are probably out there, but I haven't found them.
The remote control for that unit is model number RM-SRXD411J. You can buy a new one for about $35, or you can try to find a listing of the remote control codes.