4-1-8. 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.. -
Diagnostics
Change the CN408 (COMP, AV),
CN402(PC), CN406(Audio out) or
the Main PCB assy.
Change IC1001, IC301 or
the main PCB assy.
No
No
Yes
Yes
No sound
Yes
Check the sound source and
check the connection of
sound cable?
No
Input a sound signal.
Check the connected cable.
Replace the speaker.
Please, contact Tech support.
No
Does the signal appear at main board?
COMP/AV : R438, R440
PC : R423, R424
Monir out : R446, R447
Does the digital data appear at
Main board?
R1303 : VAL_MCLK
R1304 : VAL_BCLK
R1305 : VAL_LRCLK
R1306 : VAL_DATA
Yes
Does the signal appear at
Pin1~4 on CN302, Pin1~4 on CN301?
No
Change IC303, IC302 or
the main PCB assy.
@
Yes
0
!
Caution Make sure to disconnect the power before working on the PD board.
Notice Refer to the next page for detailed locations.
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