I GOT A KENWOOD CAR STEREO,DPX-660MD.NO SOUND.PRE AMP OUTPUT OK.CHECK INPUT SIGNAL TO IC TDA7386,OK BUT NO OUTPUT.REPLACE THIS AUD AMP IC,STILL DOING THE SAME THING.NO SERVICE MANUAL.PLEASE ANY INF ILL APPRECATE IT.

Ah YES THE DREADED NO AUDIO FAULT.Most common cause in these is someone has connected the electric antenna lead to 12v which blows the rail to the muting circuit.Replace transistor on mainboard ( i know its vague but i cant remember location ) its only a small transistor not surface mount.There is only one on the board.
Cheers
Joe

also check resitors near IC or damged tracks when remove ic