if the polymer is a polyolefin or another hydrophobic polymer, the ideal solvent is a Xylene, but obviously this process have to be heating the system.
electronics industry uses mainy thermosetting resins such as epoxies. If it is the case I think you will never find a solvant since they are highly crosslinked for many reasons, among which the dimentional stability under different stresses and conditions. Regards
It might be a bad idea to try to dissolve the polymers, if you do that then how will you get the polymers away from the solvent again. A better route would be to separate the polymers as much as possible using things like float / sink separations and froth floatation then reextrude the plastics to make new objects. There is a man at Chalmers (Erik Stenvall) who will defend a PhD thesis on the recycling of plastic waste from WEEE later this month
electronics materials are mainly based on thermosetting resins filled with silica or other kinds of cermic, these kind of polymer are not soluble in any solvent even in the presence of heat, however some kind of thermoplastics are also sometimes used, so by using some of prganic solvent according to their polarity we can recycle them.
There are so many types of polymer. What type of polymer you want to dissolve in solvent please mentioned. Other wise it is impossible. Suppose there is no such view of solvent for anulon polymer for dissolve but I have dissolve that polymer in a particular solvent. Actually, nothing is impossible, you have to know the character and proper functional group and huge effort.