I have a sony xplod xm2165gtx that i got from a friend. The problem is that he blew it up some how. I believe he hooked the positive to the negative and the negative to the positive. I don't know too much about this but i think with a little help i could figure out what's wrong. There is a row of 8 black transistor looking things but i'm not sure exactly what they are and the ones that are melted are melted so bad i can't read the numbers to find replacements for them. Please help i would greatly appreciate it.