Samsung UA40B7000WM Service Manual page 56

4. Troubleshooting
4-1-8. No Sound
Symptom Video is normal but there is no sound.
-
When the speaker connectors are disconnected or damaged.
-
Major
When the sound processing part of the Main Board is not functioning.
-
checkpoints
Speaker defect..
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Caution Make sure to disconnect the power before working on the PD board.
CN3001 CN3001
0
Diagnostics
!
@
4-22
CN3005 CN3005 CN3004 CN3004
CN3011 CN3011
No sound
Yes
Check the sound source and
check the connection of
sound cable?
Yes
Does the signal appear at R3069,
R3071?
Yes
Does the digital data appear at
pin27,28,29 of IC2002?
Yes
Does the signal appear at
pin1~4 of CN2001?
Yes
Check the LVDS cable?
Replace the speaker?
Input a sound signal.
No
Check the connected cable.
No Check CN3005
Change the main PCB assy
Check IC2001
No
Change the main PCB assembly
Check IC2002
No
Change the main PCB assembly
No
Please, contact Tech support