Samsung SC-148B Service Manual page 31

No audio output
Insert audio disc.
Y
Focus lock?
Y
Spindle Motor rotates?
Y
Audio signal is outputted in
IC201 77, 80Pin?
Y
Audio signal is outputted in
IC701 1. 7Pin?
Y
Audio signal is outputted in JK 701
N
Refer to 'No focus lock'
N
Refer to 'No Spindle Motor rotation'
N
Check IC201 power and soldering.
N
Check IC701 power input and
peripheral integer VR soldering.
N
Check L702, L701 soldering
24
N
Replace IC201
N
Replace IC701