Samsung LN52B550K1F - No Sound

4-22
4. Troubleshooting
4-1-9. No Sound
Symptom Video is normal but there is no sound..-
Major
checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning.
Speaker defect..
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Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
No
Check CN701 or CN805
Change the Main Assy
550 32” : BN94-02518A
550 37” : BN94-02518B
550 40” : BN94-02518A
550 46” : BN94-02518D
550 52” : BN94-02518E
540 40” : BN94-02510A
540 46” : BN94-02510B
540 52” : BN94-02510C
No
Does the DC B3.3V, B12V
appear at C133, C112?
Check the source and
check the connection of sound cable
(Comp/PC/DVI to HDMI).
Change the Main Assy
550 32” : BN94-02518A
550 37” : BN94-02518B
550 40” : BN94-02518A
550 46” : BN94-02518D
550 52” : BN94-02518E
540 40” : BN94-02510A
540 46” : BN94-02510B
540 52” : BN94-02510C
No
Check IC103 (Audio CODEC)
Change the Main Assy
550 32” : BN94-02518A
550 37” : BN94-02518B
550 40” : BN94-02518A
550 46” : BN94-02518D
550 52” : BN94-02518E
540 40” : BN94-02510A
540 46” : BN94-02510B
540 52” : BN94-02510C
No
Does the I2C data appear at R416?
Check IC201 (Saturn4)
Check IC103 (Sound AMP)
Change the Main Assy
550 32” : BN94-02518A
550 37” : BN94-02518B
550 40” : BN94-02518A
550 46” : BN94-02518D
550 52” : BN94-02518E
540 40” : BN94-02510A
540 46” : BN94-02510B
540 52” : BN94-02510C
No
Does the sound data appear at
C180, C177 (R +/-)
C179, C176 (L +/-)?
No
Please, Contact Tech support
Replace speaker
BN96-09463A
Does the sound data appear at
TP - V2SR, V2SL (AV2 R/L)
R745, R744 (Comp1, AV1 R/L)
R712, R713 (Comp2 R/L)
R749, R748 (DVI R/L)
R741, R740 (PC R/L)?
Yes
Yes
Yes
Yes
Input the sound source properly.
Yes
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