Thank you,I know all this and I know the solution of optical audio but I have the 2 ARC connectionsand Tried 2 cables, the problem is on the samsung and think.
Arc to arc connection, video and sound of dvd pass to the TV but the sound of TV doesn't pass to the pioneer.
Diagnose on the pioneer detect a problem on TV side.
Don't see any set-up option for ARC on the Samsung.
Thank's