Samsung DVD-P380 Service Manual page 40

Trouble Shooting
4-
CD/DVD L/R output error
(Mix Audio output)
Is AIC-, 
output normal
Yes
Base terminal level
of AQ are "L"?
Yes
Check JACK peripheral
soldering shot
No
Check A IC-ACI peripheral
circuit
Refer to a pattern
image of Table 4-9
No
Check ZIC-4 mute.
Refer to a pattern
image of Table 4-9
Samsung Electronics