Samsung SyncMaster 150MP Service Manual page 19

5 Troubleshooting
5-4 No Sound
Does the high signal at R822?
Yes
Check Pin 12 of IC800 (TDA7268)
Yes
Check Pin 60, 67 of
IC801 (MSP3450)
Yes
Check IC703, tuner, related circuit of IC703
and tuner
5-4
No
Check R856 and replace Q801.
No
Replace IC800.
No
Replace IC801 (MSP3450).
SyncMaster 150MP