Well, I am in the middle of a complete stereo upgrade, including the same head unit. So, how did the rca's blow out- while working on it, or on their own? And how exactly does playing with a ground help? I am assuming you grounded out the shield, which I guess normally "floats" since it is an audio ground?
If you dont fix it, how much do you want for the dead unit?
Ebay has them for $202! (plus shipping of 15 or so...)
Anyway, takle care and good luck...