Samsung UA42EH5000R Service Manual page 53

Chassis: u73a
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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.
Diagnostics
7
Make sure to disconnect the power before working on the IP Board.
Caution
Check the source and check the
connection of sound cable?
(Comp/PC/DVI to HDMI)
Yes
Check the Self Diagnosis (Support ⇢
Self Diagnosis ⇢ Picture Test) Dose the
promblem still exist self diagnosis?
Yes
Does the sound data appear at?
R403/R405 (AV1, COMP1)
R428_PC/R429_PC(PC/DVI)
Yes
Does the DC B12_18VS appear at?
BD217_L/BD211_S?
Yes
Does the sound data appear at?
- L-, L+, R-, R+
Yes
Replace speaker.
No
Input the sound source properly.
Check external devices and
No
connections.
Check CN403, CN402_PC.
No
Change the Main Ass'y.
No
Change the Main Ass'y.
Check IC1001.
No
Check IC301 (Sound AMP).
Change the Main Ass'y.
No
Please, Contact Tech support.
4. Troubleshooting
4-17

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