Came in heavily corroded. I ultrasonic cleaned and reaplced both bad CD3217 and now computer is turning on. everything is working execpt there is no sound. sound is being detected in system prefs but sound is coming out of speakers. i found a couple of shorts around u6400 so i removed it and shorts went away. replaced it and all is good, but still not getting sound. the only issue is a short to ground on spkramp_rl_mode. i replaced u6400 again and replaced r6481 but still same issue. if i remove the resistor the short to ground goes away. i am at a loss on this. did i get 2 bad chips? is this suppose to show short to ground?. i don't think so becuase spkramp_fl_mode is not on u6450 side.