Samsung LA22N21B Service Manual page 47

5-8 No Sound
Picture is display, no sound.
Yes
Does the signal appear at
Pin 67 (Tuner Sound signal) and
Pin 47,48 (PC Sound) and
15
Pin 53, 54 (COMP1_L, R Sound) and
Pin 56, 57 (COMP2_L, R Sound) and
Pin 50, 51 (VCR) of IC703
(MSP3420G)?
Yes
Check the DC +8V, +9V, +5V
16
of IC703, IC701?
Yes
Does the signal appear at
17
L701 ~L704 ?
Yes
Replace the speaker ass'y?
(BN96-00714A(L), BN96-
00716(R))
LA22N21B
Connect a sound cable.
No
(BN39-00148A,BN39-00448A)
control a volume.
Check a connection harness and
No
headphone jack.
Change a A/V input jack ass'y
(BN96-00894A).
Check a IC601, IC606 and IC607.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC701.
No
Change a main PCB ass'y
(BN94-00496X).
5 Troubleshooting
5-17