I'm wondering if anyone can assist us or offer any advice to deal with our
little dilemma. Reworking BGA's is fairly new process for us.
  I'm attempting to rework a 313 contact plastic BGA on a 10 layer board. I end up
having either cold solder or shorts between contacts. We are using a SNIPER
SMD-7007 rework station at 375 F degrees. We have used the same heat profile our
other ceramic BGA's without having any problems..

  Any comments would be greatly appreciated.

Regards,
Nick D'Onofrio
Quality Assurance