well drying out a blown circuit is not going to un-blow the circuit. I think perhaps today's phone are designed to have some sort of "breakers" on them that protect the truly important bits that cannot be replaced. I think the main thing is that if you phone or whatever else switches off then you need to be patient while the rice does its magic. If you try to force it to turn on when it isn't ready I think you'll break it all the way.