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37LG33R, 37LG34R (CHASSIS:LP81A) - LG TV Service Manual (repair manual). Page 21

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10-1 Symptom
1) LED is green.
2) Screen display but sound is not output.
10. No Sound
10-2 Check process
All input(mode)
is no sound.
Only HDMI is
no sound
Only AV/
COM2/PC input is 
no soudn.
Only RF is no sound.
Check the Tuner In/Out.
Check the signal after
IC600 refer to circuit
diagram
Is the output of
IC600 normal?
Download the EDID data.
No
No
No
No
No
Yes
Yes
Yes
Yes
Menu?
Normal
Normal
No
No
No
No
Yes
Yes
Yes
Replace 
IC600
Is the speaker
on it men?
Set on speaker
in menu
Check the 
Speaker cable
Replace
IC801
Replace
IC601
Is the speaker
cable normal?
IC801 operate
normal?
IC 601 operate
normal?
Replace Main B/D
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