4-2-7. 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.•
Diagnostics
Check the source and connection of
sound cable (Comp/PC/DVI to HDMI)?
No
Input the sound source properly.
Yes
Check the Self Diagnosis (Support →
Self Diagnosis → Picture Test).
Dose the promblem still exist self
diagnosis?
No
Check external devices and
connections.
Yes
Does the sound data appear at R426_
COMP/R427_COMP (AV1, COMP1)?
No
Check CN401_COMP.
Change the Main Assy.
Yes
Does the DC B13V_AMP_PW appear at
BD1602_AD?
No
Change the Main Assy.
Yes
1
Does the sound waveform appear at L-,
L+, R-, R+.
No
Check IC901 (NT13).
Check IC303 (Sound AMP).
Change the Main Assy.
Yes
Replace speaker.
Yes
Please, Contact tech support.
Caution Make sure to disconnect the power before working on the Main board.
4-18
4. Troubleshooting
4-19
4. Troubleshooting
4-18
4. Troubleshooting
4-19
4. Troubleshooting
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