1) Did you interact with each JV partner prior to launch? ... via telephone (or Skype, IM), hopefully?
2) Did you email your JV list on a regular basis throughout pre launch and launch with updates (launch numbers, new promo material/tools)? Did every email have login URL and account access?
3) Did you run a JV partner sales contest? ... and keep your partners aware of the standings?
4) Did you promise a reciprocal mailing at a date to be negotiated after launch in exchange for their participation?
Let's start with the aforementioned ... and go from there.