32LC41, 32LC42, 32LC43, 32LC44, 32LC4R (CHASSIS:LP78A) - LG TV Service Manual (repair manual). Page 23

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14. No Sound
(1) Symptom
1) LED is green.
2) There is a picture but no sound.
(2) Follow check
Is there
sound in any
mode?
Is the speaker on?
Yes
Yes
Is the speaker
cable normal?
Yes
Yes
Is there
no sound only for
HDMI?
Yes
Is there no 
sound only AV
/COM2/PC?
Is the
output of IC600
(R607, R608)
normal?
Yes
Is there
no sound only for
RF?
No
No
No
No
Download the EDID data.
Set speaker on 
in the menu.
No
Replace the
IC600
No
Check the Speaker
cable
No
Is the IC500
operating normal?
Replace the IC500
No
Yes
Is the IC601
operating normal?
Replace the IC601
Replace the VSC BD
Yes
Check the signal after IC600.
refer to circuit diagram.
Check the Tuner In/Out.
No
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