LG 42LC51 Service Manual page 23

14. No Sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
(2) Check following
All input(mode)
is no sound.
Yes
Only HDMI is
no sound.
Yes
Only AV
/COM2/PC input is
no sound.
Yes
Only RF is no sound.
No
No
Download the EDID data.
No
Is the output
of IC600(R607, R608)
normal?
Yes
Check the signal after
IC600 refer to circuit
diagrma.
No
Check the Tuner In/Out.
Is the speaker
on it men?
Is the speaker
cable normal?
No
Replace IC600
IC500 operae
nor mall?
IC601 operae
nor mall?
Replace VSC BD
- 23 -
No
Set on speaker
in menu.
Yes
No
Check the Speaker
cable
Yes
No
Replace IC500
Yes
No
Replace IC601
Yes