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37LC41 (CHASSIS:LP78A) - LG TV Service Manual (repair manual). Page 24

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14. No Sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
(2) Check following
- 24 -
All input(mode) 
is no sound.
Is the speaker 
on it men?
Yes
Yes
Menu?
Normal
Is the speaker
cable normal?
Yes
Yes
Only HDMI is
no sound.
Yes
Only AV
/COM2/PC input is
no sound.
Is the output
of IC600(R607, R608)
normal?
Yes
Only RF is no sound.
No
No
No
No
Download the EDID data.
Set on speaker
in menu.
No
Replace IC600
No
Check the Speaker
cable
No
IC500 operae
nor mall?
Replace IC500
No
Yes
IC601 operae
nor mall?
Replace IC601
Replace VSC BD
Yes
Check the signal after
IC600 refer to circuit
diagrma.
Check the Tuner In/Out.
No
Normal
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